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1. ZJ WIRING DIAGRAMS 8W - 1
WIRING DIAGRAMS
CONTENTS
page page
8W-01 GENERAL INFORMATION - WIRING 8W-47 AUDIO SYSTEM . . . . . . . . . . . . . . 8W-47-1
DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . 8W-01-1 8W-48 HEATED REAR WINDOW . . . . . . . 8W-48-1
8W-10 FUSE BLOCK . . . . . . . . . . . . . . . . . 8W-10-1 8W-49 OVERHEAD CONSOLE . . . . . . . . . . 8W-49-1
8W-11 POWER DISTRIBUTION . . . . . . . . 8W-11-1 8W-50 FRONT LIGHTING . . . . . . . . . . . . . 8W-50-1
8W-15 GROUND DISTRIBUTION . . . . . . . 8W-15-1 8W-51 REAR LIGHTING . . . . . . . . . . . . . . 8W-51-1
8W-20 CHARGING SYSTEM . . . . . . . . . . . 8W-20-1 8W-52 TURN SIGNALS . . . . . . . . . . . . . . . 8W-52-1
8W-21 STARTING SYSTEM . . . . . . . . . . . 8W-21-1 8W-53 WIPERS . . . . . . . . . . . . . . . . . . . . . 8W-53-1
8W-30 FUEL/IGNITION . . . . . . . . . . . . . . . 8W-30-1 8W-54 TRAILER TOW . . . . . . . . . . . . . . . . 8W-54-1
8W-31 TRANSMISSION COLTROLS . . . . . 8W-31-1 8W-60 POWER WINDOWS . . . . . . . . . . . . 8W-60-1
8W-32 ANTI-LOCK BRAKES . . . . . . . . . . . 8W-32-1 8W-61 POWER DOOR LOCKS . . . . . . . . . 8W-61-1
8W-33 VEHICLE SPEED CONTROL . . . . . 8W-33-1 8W-62 POWER MIRRORS . . . . . . . . . . . . 8W-62-1
8W-39 VEHICLE THEFT ALARM . . . . . . . . 8W-39-1 8W-63 POWER SEAT . . . . . . . . . . . . . . . . 8W-63-1
8W-40 GAUGES . . . . . . . . . . . . . . . . . . . . 8W-40-1
8W-41 HORN/CIGAR LIGHTER . . . . . . . . . 8W-41-1 8W-64 POWER SUNROOF . . . . . . . . . . . . 8W-64-1
8W-42 AIR CONDITIONING . . . . . . . . . . . 8W-42-1 8W-70 SPLICE INFORMATION . . . . . . . . . 8W-70-1
8W-43 AIRBAG SYSTEM . . . . . . . . . . . . . 8W-43-1 8W-80 CONNECTOR PIN OUTS . . . . . . . . 8W-80-1
8W-44 INTERIOR LIGHTING . . . . . . . . . . . 8W-44-1 8W-90 CONNECTOR LOCATIONS . . . . . . . 8W-90-1
8W-46 MESSAGE CENTER . . . . . . . . . . . . 8W-46-1 8W-95 SPLICE LOCATIONS . . . . . . . . . . . 8W-95-1
HOW TO USE THIS GROUP SECTION IDENTIFICATION
The purpose of this group is to show the electrical Sections in Group 8W are organized by sub-sys-
circuits in a clear, simple fashion and to make tems. The sections contain circuit operation descrip-
troubleshooting easier. Components that work to- tions, helpful information, and system diagrams. The
gether are shown together. All electrical components intention is to organize information by system, consis-
used in a specific system are shown on one diagram. tently from year to year.
The feed for a system is shown at the top of the page.
All wires, connectors, splices, and components are CONNECTOR LOCATIONS
shown in the flow of current to the bottom of the Section 8W-90 contains Connector Location illustra-
page. Wiring which is not part of the circuit repre- tions. The illustrations contain the connector number
sented is referenced to another page/section, where and component identification. Connector Location
the complete circuit is shown. In addition, all charts in Section 8W-90 reference the illustration
switches, components, and modules are shown in the
number for components and connectors.
at rest position with the doors closed and the
Section 8W-80 shows each connector and the cir-
key removed from the ignition.
cuits involved with that connector. The connectors are
If a component is part of several different circuits, it
identified using the number on the Diagram pages.
is shown in the diagram for each. For example, the
headlamp switch is the main part of the exterior
lighting, but it also affects the interior lighting and
SPLICE LOCATIONS
the chime warning system. Splice Location charts in Section 8W-70 show the
It is important to realize that no attempt is entire splice, and provide references to other sections
made on the diagrams to represent components the splice serves.
and wiring as they appear on the vehicle. For Section 8W-95 contains illustrations that show the
example, a short piece of wire is treated the general location of the splices in each harness. The
same as a long one. In addition, switches and illustrations show the splice by number, and provide a
other components are shown as simply as pos- written location.
sible, with regard to function only.
The wiring diagram show circuits for all wheel-
bases. If there is a difference in systems or compo-
nents between wheel-bases, an identifier is placed
next to the component.
2.
3. ZJ 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS 8W - 01 - 1
GENERAL INFORMATION - WIRING DIAGRAMS
INDEX
page page
Circuit Identification . . . . . . . . . . . . . . . . . . . . . .. . . 1 Take Outs . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . 2
Connector and Terminal Replacement . . . . . . . .. . . 7 Terminal Replacement . . . . . . . . . . . . . . . . . . ... . . 8
Connector Replacement . . . . . . . . . . . . . . . . . .. . . 6 Terminal/Connector Repair—Molex Connectors .. . . 6
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 2 Troubleshooting Tests . . . . . . . . . . . . . . . . . . ... . . 4
Diode Replacement . . . . . . . . . . . . . . . . . . . . .. . . 8 Troubleshooting Tools . . . . . . . . . . . . . . . . . . ... . . 4
Electrostatic Discharge (ESD) Sensitive Devices . . . 2 Troubleshooting Wiring Problems . . . . . . . . . ... . . 5
Intermittent and Poor Connections . . . . . . . . . . .. . . 4 Wire Code Identification . . . . . . . . . . . . . . . . ... . . 1
Notes, Cautions, and Warnings . . . . . . . . . . . . .. . . 1 Wiring Repair . . . . . . . . . . . . . . . . . . . . . . . . ... . . 6
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 2
NOTES, CAUTIONS, and WARNINGS TO PREVENT SERIOUS BURNS, AVOID CONTACT
Throughout this group additional important infor- WITH HOT PARTS SUCH AS THE RADIATOR, EX-
mation is presented in three ways; Notes, Cautions, HAUST MANIFOLD(S), TAIL PIPE, CATALYTIC CON-
and Warnings. VERTER, AND MUFFLER.
NOTES are used to help describe how switches or
components operate to complete a particular circuit.
DO NOT ALLOW FLAME OR SPARKS NEAR THE
They are also used to indicate different conditions
that may appear on the vehicle. For example, an BATTERY. GASES ARE ALWAYS PRESENT IN AND
up-to and after condition. AROUND THE BATTERY.
CAUTIONS are used to indicate information that
could prevent making an error that may damage the ALWAYS REMOVE RINGS, WATCHES, LOOSE
vehicle. HANGING JEWELRY, AND LOOSE CLOTHING.
WARNINGS provide information to prevent per-
sonal injury and vehicle damage. Below is a list of
general warnings that should be followed any time a WIRE CODE IDENTIFICATION
vehicle is being serviced. Each wire shown in the diagrams contains a code
(Fig. 1) which identifies the main circuit, part of the
ALWAYS WEAR SAFETY GLASSES FOR EYE PRO-
main circuit, gauge of wire, and color. The color is
TECTION.
shown as a two letter code which can be identified by
referring to the Wire Color Code Chart (Fig. 2).
USE SAFETY STANDS ANYTIME A PROCEDURE RE-
QUIRES BEING UNDER A VEHICLE.
BE SURE THAT THE IGNITION SWITCH ALWAYS IS
IN THE OFF POSITION, UNLESS THE PROCEDURE
REQUIRES IT TO BE ON.
SET THE PARKING BRAKE WHEN WORKING ON
ANY VEHICLE. AN AUTOMATIC TRANSMISSION
SHOULD BE IN PARK. A MANUAL TRANSMISSION
SHOULD BE IN NEUTRAL.
OPERATE THE ENGINE ONLY IN A WELL-VENTI-
LATED AREA.
Fig. 1 Wire Color Code Identification
KEEP AWAY FROM MOVING PARTS WHEN THE EN- CIRCUIT IDENTIFICATION
GINE IS RUNNING, ESPECIALLY THE FAN AND All circuits in the diagrams use an alpha/numeric
BELTS. code to identify the wire and its function (Fig. 3). To
4. 8W - 01 - 2 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS ZJ
CONNECTORS
Connectors shown in the diagrams are identified
using the international standard arrows for male and
female terminals (Fig. 4). A connector identifier is
placed next to the arrows to indicate the connector
number (Fig. 4).
Fig. 4 Connector Identification
For viewing connector pin outs, with two terminals
or greater, refer to section 8W-80. This section iden-
Fig. 2 Wire Color Code Chart tifies the connector by number and provides terminal
numbering, circuit identification, wire colors, and
identify which circuit code applies to a system, refer
functions.
to the Circuit Identification Code Chart. This chart
All connectors are viewed from the terminal end
shows the main circuits only and does not show the
unless otherwise specified. To find the connector loca-
secondary codes that may apply to some models.
tion in the vehicle refer to section 8W-90. This sec-
tion uses the connector identification number from
the wiring diagrams to provide a figure number ref-
erence.
TAKE OUTS
The abbreviation T/O is used in the component lo-
cation section to indicate a point in which the wiring
harness branches out to a component.
SYMBOLS
Various symbols are used throughout the Wiring
Diagrams. These symbols can be identified by refer-
ring to the symbol identification chart (Fig. 5).
ELECTROSTATIC DISCHARGE (ESD) SENSITIVE
DEVICES
All ESD sensitive components are solid state and a
symbol (Fig. 6) is used to indicate this. When han-
dling any component with this symbol, comply with
the following procedures to reduce the possibility of
electrostatic charge build up on the body and inad-
vertent discharge into the component. If it is not
known whether the part is ESD sensitive, assume
that it is.
(1) Always touch a known good ground before han-
dling the part. This should be repeated while han-
dling the part and more frequently after sliding
Fig. 3 Circuit Identification across a seat, sitting down from a standing position,
or walking a distance.
5. ZJ 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS 8W - 01 - 3
Fig. 5 Symbol Identification
6. 8W - 01 - 4 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS ZJ
(2) Avoid touching electrical terminals of the part, • Probing Tools - These tools are used for probing
unless instructed to do so by a written diagnostic terminals in connectors (Fig. 7). Select the proper
procedure. size tool from Special Tool Package 6807, and insert
(3) When using a voltmeter, be sure to connect the it into the terminal being tested. Use the other end
ground lead first. of the tool to insert the meter probe.
(4) Do not remove the part from its protective
packing until it is time to install the part.
(5) Before removing the part from its package,
ground the package to a known good ground on the
vehicle.
Fig. 7 Probing Tool
INTERMITTENT AND POOR CONNECTIONS
Most intermittent electrical problems are caused by
faulty electrical connections or wiring. It is also pos-
sible for a sticking component or relay to cause a
Fig. 6 Electrostatic Discharge Symbol
problem. Before condemning a component or wiring
TROUBLESHOOTING TOOLS assembly check the following items.
When diagnosing a problem in an electrical circuit • Connectors are fully seated
there are several common tools necessary. These tools • Spread terminals, or terminal push out
are listed and explained below. • Terminals in the wiring assembly are fully seated
• Jumper Wire - This is a test wire used to connect into the connector/component and locked in position
two points of a circuit. It can be used to bypass an • Dirt or corrosion on the terminals. Any amount of
open in a circuit. corrosion or dirt could cause an intermittent problem
• Damaged connector/component casing exposing the
WARNING: NEVER USE A JUMPER WIRE ACROSS item to dirt and moisture
A LOAD, SUCH AS A MOTOR, CONNECTED BE- • Wire insulation that has rubbed through causing a
TWEEN A BATTERY FEED AND GROUND. short to ground
• Wiring broke inside of the insulation
• Voltmeter - Used to check for voltage on a circuit.
Always connect the black lead to a known good TROUBLESHOOTING TESTS
ground and the red lead to the positive side of the Before beginning any tests on a vehicle’s electrical
circuit. system, use the Wiring Diagrams and study the cir-
cuit. Also refer to the Troubleshooting Wiring Prob-
CAUTION: Most of the electrical components used
lems section in this section.
in today’s vehicle are solid state. When checking
voltages in these circuits use a meter with a 10-me- TESTING FOR VOLTAGE
gohm or greater impedance. (1) Connect the ground lead of a voltmeter to a
known good ground (Fig. 8).
• Ohmmeter - Used to check the resistance between
(2) Connect the other lead of the voltmeter to the
two points of a circuit. Low or no resistance in a cir-
selected test point. The vehicle ignition may need to
cuit means good continuity.
be turned ON to check voltage. Refer to the appropri-
CAUTION: - Most of the electrical components used ate test procedure.
in today’s vehicle are Solid State. When checking
resistance in these circuits use a meter with a 10- TESTING FOR CONTINUITY
megohm or greater impedance. In addition, make (1) Remove the fuse for the circuit being checked
sure the power is disconnected from the circuit. or, disconnect the battery.
Circuits that are powered up by the vehicle electri- (2) Connect one lead of the ohmmeter to one side
cal system can cause damage to the equipment and of the circuit being tested (Fig. 9).
provide false readings.
7. ZJ 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS 8W - 01 - 5
(3) Starting at the fuse block, wiggle the wiring
harness about six to eight inches apart and watch
the voltmeter/test lamp.
(4) If the voltmeter registers voltage or the test
lamp glows, there is a short to ground in that gen-
eral area of the wiring harness.
TESTING FOR A SHORT TO GROUND ON
FUSES POWERING SEVERAL LOADS
(1) Refer to the wiring diagrams and disconnect or
isolate all items on the fused circuit.
(2) Replace the blown fuse.
(3) Supply power to the fuse by turning ON the ig-
nition switch or re-connecting the battery.
(4) Start connecting the items in the fuse circuit
one at a time. When the fuse blows the circuit with
the short to ground has been isolated.
TESTING FOR A VOLTAGE DROP
(1) Connect the positive lead of the voltmeter to
the side of the circuit closest to the battery (Fig. 10).
(2) Connect the other lead of the voltmeter to the
Fig. 8 Testing for Voltage other side of the switch or component.
(3) Connect the other lead to the other end of the (3) Operate the item.
(4) The voltmeter will show the difference in volt-
circuit being tested. Low or no resistance means good
age between the two points.
continuity.
Fig. 10 Testing for Voltage Drop
Fig. 9 Testing for Continuity
TESTING FOR A SHORT TO GROUND TROUBLESHOOTING WIRING PROBLEMS
(1) Remove the fuse and disconnect all items in- When troubleshooting wiring problems there are
six steps which can aid in the procedure. The steps
volved with the fuse.
are listed and explained below. Always check for non-
(2) Connect a test light or a voltmeter across the
factory items added to the vehicle before doing any
terminals of the fuse.
diagnosis. If the vehicle is equipped with these items,
disconnect them to verify these add-on items are not
the cause of the problem.
8. 8W - 01 - 6 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS ZJ
(1) Verify the problem.
(2) Verify any related symptoms. Do this by per-
forming operational checks on components that are
in the same circuit. Refer to the wiring diagrams.
(3) Analyze the symptoms. Use the wiring dia-
grams to determine what the circuit is doing, where
the problem most likely is occurring and where the
diagnosis will continue.
(4) Isolate the problem area.
(5) Repair the problem.
(6) Verify proper operation. For this step, check for
proper operation of all items on the repaired circuit.
Refer to the wiring diagrams.
WIRING REPAIR
When replacing or repairing a wire, it is important
that the correct gauge be used as shown in the wir-
ing diagrams. The wires must also be held securely
in place to prevent damage to the insulation.
(1) Disconnect battery negative cable.
(2) Remove 1 inch of insulation from each end of
Fig. 11 Wire Repair
the wire.
(3) Place a piece of heat shrink tubing over one
side of the wire. Make sure the tubing will be long
enough to cover and seal the entire repair area.
(4) Spread the strands of the wire apart on each
part of the exposed wires (Fig. 11 example 1).
(5) Push the two ends of wire together until the
strands of wire are close to the insulation (Fig. 11 ex-
ample 2).
(6) Twist the wires together (Fig. 11 example 3).
(7) Solder the connection together using rosin core
type solder only. Do not use acid core solder.
(8) Center the heat shrink tubing over the joint,
and heat using a heat gun. Heat the joint until the
tubing is tightly sealed and sealant comes out of both
ends of the tubing.
(9) Secure the wire to the existing ones to prevent Fig. 12 Molex Connector Repair
chafing or damage to the insulation.
(10) Connect battery and test all affected systems.
TERMINAL/CONNECTOR REPAIR—MOLEX
CONNECTORS
(1) Disconnect battery.
(2) Disconnect the connector from its mating half/
component.
(3) Insert the terminal releasing special tool 6742
into the terminal end of the connector (Fig. 12).
(4) Using special tool 6742, release the locking fin-
gers on the terminal (Fig. 13).
(5) Pull on the wire to remove it from the connec-
tor.
(6) Repair or replace the connector or terminal as
necessary. Fig. 13 Using Special Tool 6742
(2) Disconnect the connector that is to be repaired
CONNECTOR REPLACEMENT
from its mating half/component.
(1) Disconnect battery.
9. ZJ 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS 8W - 01 - 7
(3) Remove connector locking wedge, if required
(Fig. 14).
Fig. 16 Terminal Removal Using Special Tool
(3) Cut off the existing wire connector directly be-
Fig. 14 Connector Locking Wedge Tab (Typical) hind the insulator. Remove six inches of tape from
(4) Position the connector locking finger away from the harness.
the terminal using the proper pick from special tool (4) Stagger cut all wires on the harness side at 1/2
kit 6680. Pull on the wire to remove the terminal inch intervals (Fig. 17).
from the connector (Fig. 15, and Fig. 16). (5) Remove 1 inch of insulation from each wire on
(5) Reset the terminal locking tang, if it has one. the harness side.
(6) Insert the removed wire in the same cavity on (6) Stagger cut the matching wires on the repair
the repair connector. connector assembly in the opposite order as was done
(7) Repeat steps four through six for each wire in on the harness side of the repair. Allow extra length
the connector, being sure that all wires are inserted for soldered connections. Check that the overall
into the proper cavities. For additional connector pin- length is the same as the original (Fig. 17).
out identification, refer to the wiring diagrams.
(8) Insert the connector locking wedge into the re-
paired connector, if required.
(9) Connect connector to its mating half/compo-
nent.
(10) Connect battery and test all affected systems.
Fig. 17 Stagger Cutting Wires (Typical)
(7) Remove 1 inch of insulation from each wire.
(8) Place a piece of heat shrink tubing over one
side of the wire. Be sure the tubing will be long
enough to cover and seal the entire repair area.
(9) Spread the strands of the wire apart on each
Fig. 15 Terminal Removal part of the exposed wires (Fig. 11 example 1).
CONNECTOR AND TERMINAL REPLACEMENT (10) Push the two ends of wire together until the
(1) Disconnect battery. strands of wire are close to the insulation (Fig. 11 ex-
(2) Disconnect the connector (that is to be re- ample 2).
paired) from its mating half/component.
10. 8W - 01 - 8 8W-01 GENERAL INFORMATION - WIRING DIAGRAMS ZJ
(11) Twist the wires together (Fig. 11 example 3). (15) Insert the repaired wire into the connector.
(12) Solder the connection together using rosin (16) Install the connector locking wedge, if re-
core type solder only. Do not use acid core solder. quired, and reconnect the connector to its mating
(13) Center the heat shrink tubing over the joint half/component.
and heat using a heat gun. Heat the joint until the (17) Re-tape the wire harness starting 1-1/2 inches
tubing is tightly sealed and sealant comes out of both behind the connector and 2 inches past the repair.
ends of the tubing. (18) Connect the battery, and test all affected sys-
(14) Repeat steps 8 through 13 for each wire. tems.
(15) Re-tape the wire harness starting 1-1/2 inches
behind the connector and 2 inches past the repair. DIODE REPLACEMENT
(16) Re-connect the repaired connector. (1) Disconnect the battery.
(17) Connect the battery, and test all affected sys- (2) Locate the diode in the harness, and remove
tems.
the protective covering.
(3) Remove the diode from the harness, pay atten-
TERMINAL REPLACEMENT
tion to the current flow direction (Fig. 18).
(1) Disconnect battery.
(2) Disconnect the connector being repaired from
its mating half.
(3) Remove connector locking wedge, if required
(Fig. 14).
(4) Position the connector locking finger away from
the terminal using the proper pick from special tool
kit 6680. Pull on the wire to remove the terminal
from the connector (Figs. 15 and 16).
(5) Cut the wire 6 inches from the back of the con-
nector.
(6) Remove 1 inch of insulation from the wire on
the harness side.
(7) Select a wire from the terminal repair assembly
that best matches the color wire being repaired.
(8) Cut the repair wire to the proper length and re-
move 1 inch of insulation.
(9) Place a piece of heat shrink tubing over one Fig. 18 Diode Identification
side of the wire. Make sure the tubing will be long (4) Remove the insulation from the wires in the
enough to cover and seal the entire repair area. harness. Only remove enough insulation to solder in
(10) Spread the strands of the wire apart on each the new diode.
part of the exposed wires (Fig. 11 example 1).
(5) Install the new diode in the harness, making
(11) Push the two ends of wire together until the
sure current flow is correct. If necessary, refer to the
strands of wire are close to the insulation (Fig. 11 ex-
appropriate wiring diagram for current flow.
ample 2).
(6) Solder the connection together using rosin core
(12) Twist the wires together (Fig. 11 example 3).
(13) Solder the connection together using rosin type solder only. Do not use acid core solder.
core type solder only. Do not use acid core solder. (7) Tape the diode to the harness using electrical
(14) Center the heat shrink tubing over the joint tape. Make sure the diode is completely sealed from
and heat using a heat gun. Heat the joint until the the elements.
tubing is tightly sealed and sealant comes out of both (8) Re-connect the battery, and test affected sys-
ends of the tubing. tems.
43. ZJ 8W-20 CHARGING SYSTEM 8W - 20 - 1
CHARGING SYSTEM
CHARGING SYSTEM age. The generator supplies B+ voltage to the battery
The charging system is an integral part of the bat- through the A11 and A0 circuits.
tery and starting systems. Because all these systems
work in conjunction, diagnose and test them together. HELPFUL INFORMATION
Circuit A11 connects to the generator output termi- • Check the 20 amp fuse located in cavity 2 of the
nal and splices to fuse F8 and fuse F16 in the Power PDC.
Distribution Center (PDC). Circuit A0 connects the • Circuit A5 also splices to provide power for the
battery to the PDC. fuel pump relay.
Circuit Z0 provides ground for the generator. Cir- • The ASD relay supplies battery voltage for the fuel
cuit Z0 attaches to the rear of the right side of the injectors, ignition coil, and the heated oxygen sensor.
engine, and is spliced to the battery negative termi- The fuel pump relay powers the fuel pump module.
nal. • Refer to the appropriate group of the Service Man-
Power for the field terminal of the generator is sup- ual or the appropriate Diagnostic Test Procedures
plied by circuit A61. The A61 circuit is connected to Manual.
the contact side of the Automatic Shut Down (ASD)
relay. DIAGRAM INDEX
Power for the contact side of the relay is supplied
by circuit A5. This circuit is protected by a 20 amp Component Page
fuse located in cavity 2 of the PDC.
Automatic Shut Down Relay . . . . . . . . . . . . . . . . .8W-20-3
When the PCM grounds the ASD relay, contacts in-
Fuse 2 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-3
side the relay close and connect circuit A5 from fuse
Fuse 6 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-3
2 in the PDC to circuit A61. Circuit A61 splices to the Fuse 8 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-2
generator field terminal. Fuse 12 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-3
The PCM has an internal voltage regulator that Fuse 16 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-2
controls generator output. The PCM controls the gen- Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-2
erator field on circuit K20. Circuit K20 connects to Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . .8W-20-3
PCM cavity 20. Powertrain Control Module . . . . . . . . . . . . . . . . .8W-20-2, 3
When the engine operates and there is current in
the generator field, the generator produces a B+ volt-
44.
45.
46.
47. ZJ 8W-21 STARTING SYSTEM 8W - 21 - 1
STARTING SYSTEM
STARTING SYSTEM cuit A1 from fuse 12 in the PDC supplies battery
voltage to the contact side of the starter motor relay.
AUTOMATIC TRANSMISSIONS The ignition switch supplies battery voltage to the
Circuit A0 from the battery is double crimped at coil side of the starter motor relay on circuit A41
the positive battery post. One branch of circuit A0 when the key is moved to the START position. Cir-
(battery positive cable) connects to the battery cuit T41 from the coil side of the relay connects to a
starter motor. The other A0 branch supplies voltage Z1 splice. Circuit Z1 provides ground for the starter
to the buss bar in the Power Distribution Center motor relay and terminates at the right fender side
(PDC). shield.
The PDC supplies battery voltage to the engine When the starter motor relay energizes and the
starter motor solenoid on circuit T40 when the coil contacts close, circuit T40 supplies battery voltage to
side of the engine starter motor relay energizes. Cir-
the starter motor solenoid. Circuit A0 from the bat-
cuit A1 from fuse 12 in the PDC supplies battery
tery supplies voltage to the starter motor when the
voltage to the contact side of the starter motor relay.
solenoid energizes.
The ignition switch supplies battery voltage to the
coil side of the starter motor relay on circuit A41 HELPFUL INFORMATION
when the key is moved to the START position and
• The Park/Neutral switch closes when the trans-
the Park/Neutral position switch is closed. Ground
for the coil side of the starter motor relay is supplied mission is in either the PARK or NEUTRAL posi-
by the case grounded Park/Neutral position switch. tions.
Circuit T41 connects the coil side of the relay to the • Circuit T41 also connects to cavity 30 of the PCM.
Park/Neutral position switch, and is also spliced to This input tells the PCM the operator is starting the
the Powertrain Control Module (PCM). vehicle.
When the starter motor relay energizes and the • Check the 40 amp fuse located in cavity F12 of the
contacts close, circuit T40 supplies battery voltage to PDC.
the starter motor solenoid. Circuit A0 from the bat-
tery supplies voltage to the starter motor when the DIAGRAM INDEX
solenoid energizes.
Component Page
MANUAL TRANSMISSIONS Clutch Pedal Position Switch . . . . . . . . . . . . . . . . .8W-21-2
Circuit A0 from the battery is double crimped at Engine Starter Motor . . . . . . . . . . . . . . . . . . . . . .8W-21-2
the positive battery post. One branch of circuit A0 Engine Starter Motor Relay . . . . . . . . . . . . . . . . . .8W-21-2
(battery positive cable) connects to the battery Fuse 11 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . .8W-21-2
starter motor. The other A0 branch supplies voltage Fuse 12 (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . .8W-21-2
to the buss bar in the Power Distribution Center Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . .8W-21-2
(PDC). Park/Neutral Position Switch . . . . . . . . . . . . . . . . .8W-21-2
The PDC supplies battery voltage to the engine Powertrain Control Module . . . . . . . . . . . . . . . . . .8W-21-2
starter motor solenoid on circuit T40 when the coil
side of the engine starter motor relay energizes. Cir-
48.
49. ZJ 8W-30 FUEL/IGNITION 8W - 30 - 1
FUEL/IGNITION
INDEX
page page
Automatic Shut Down (ASD) Relay . . . . . . . ........... 1 Fuel Pump Relay . . . . . . . . . . . . . . . . . . . . . ........... 2
Battery Feed . . . . . . . . . . . . . . . . . . . . . . . . ........... 2 General Information . . . . . . . . . . . . . . . . . . . ........... 1
Brake Switch Input . . . . . . . . . . . . . . . . . . . ........... 5 Heated Oxygen Sensor . . . . . . . . . . . . . . . . ........... 3
Camshaft Position Sensor . . . . . . . . . . . . . . ........... 3 Idle Air Control (IAC) Motor . . . . . . . . . . . . . ........... 3
CCD Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... 5 Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . . ........... 2
Crankshaft Position Sensor . . . . . . . . . . . . . ........... 3 Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . ........... 1
Data Link Connector . . . . . . . . . . . . . . . . . . ........... 5 Intake Air Temperature Sensor . . . . . . . . . . . ........... 4
Diagram Index—4.0L Engine . . . . . . . . . . . . . ........... 6 Malfunction Indicator Lamp (MIL) . . . . . . . . . ........... 5
Diagram Index—5.2L Engine . . . . . . . . . . . . . ........... 6 Manifold Absolute Pressure Sensor . . . . . . . ........... 4
Engine Coolant Temperature Sensor . . . . . . ........... 4 Park/Neutral Position Switch . . . . . . . . . . . . ........... 5
EVAP/Purge Solenoid . . . . . . . . . . . . . . . . . ........... 5 Power (Device) Ground . . . . . . . . . . . . . . . . ........... 5
Exhaust Gas Recirculation Solenoid—5.2L Engine ....... 5 Tachometer Signal . . . . . . . . . . . . . . . . . . . . ........... 5
Fuel Injectors . . . . . . . . . . . . . . . . . . . . . . . ........... 2 Throttle Position Sensor . . . . . . . . . . . . . . . . ........... 4
Fuel Pump Module . . . . . . . . . . . . . . . . . . . ........... 2 Vehicle Speed Sensor . . . . . . . . . . . . . . . . . ........... 3
GENERAL INFORMATION START POSITION
The operation of the fuel/ignition systems for the In the START position, the ignition switch connects
4.0L and the 5.2L engines available in this vehicle circuit A1 from the 40 amp fuse in cavity 12 of the
are similar. The circuit descriptions in this section Power Distribution Center (PDC) to circuit A41. Cir-
cover both engine packages. cuit A41 connects to the contact side of the engine
Where there are differences, for example Power- starter motor relay.
train Control Module (PCM) pin-outs, the circuit de- Also in the START position, the ignition switch
scriptions will be shown separately. connects circuit G9 to ground. Circuit G9 connects to
the instrument cluster and park brake switch.
IGNITION SWITCH
RUN POSITION
START OR RUN POSITION In the RUN position, the ignition switch connects
When the ignition switch is in either the START or circuit A2 from 60 amp fuse 13 in the PDC to circuit
RUN positions, it connects circuit A1 to circuit A21. A22. Circuit A22 connects to the fuse block and feeds
Circuit A1 is protected by a 40 amp fuse located in the circuits protected by fuses, 17, 18, 19 and 20. Cir-
cavity 12 of the Power Distribution Center (PDC),
cuit V34 from fuse 20 in the fuse block supplies bat-
and is HOT at all times.
tery voltage to the vehicle speed control system.
Circuit A21 connects between the ignition switch
and the 15 amp fuse located in cavity 6 of the PDC.
AUTOMATIC SHUT DOWN (ASD) RELAY
From the fuse in cavity 6, circuit F86 supplies power
When the ignition switch is in either the START or
to the coil side of the fuel pump relay. At the fuel
RUN positions, it connects circuit A1 from fuse 12 in
pump relay, circuit F86 is double pinned and supplies
power to the coil side of the Automatic Shut Down the Power Distribution Center (PDC) to circuit A21.
(ASD) relay. Circuit F86 also connects to cavity 9 of Circuit A21 supplies battery voltage to fuse 6 in the
the Powertrain Control Module (PCM). PDC.
Circuit A21 also connects to a bus bar in the fuse From fuse 6, circuit F86 supplies power to the coil
block that feeds fuses 21 and 22. side of the fuel pump relay. At the fuel pump relay,
circuit F86 is double pinned and supplies power to
ACCESSORY OR RUN POSITION the coil side of the Automatic Shut Down (ASD) re-
When the ignition switch is in either the ACCES- lay. The Powertrain Control Module (PCM) provides
SORY or RUN positions, it connects circuit A1 to cir- ground for the coil sides of the ASD relay and fuel
cuit A31. Circuit A1 is protected by a 40 amp fuse pump relay on circuit K81. Circuit K81 connects to
located in cavity 12 of the Power Distribution Center cavity 51 of the PCM.
(PDC), and is HOT at all times. When the PCM grounds the ASD relay, contacts in-
Circuit A31 connects to the fuse block and feeds the side the relay close and connect circuit A5 from fuse
circuits connected to fuses 9, 10, and 11. 2 in the PDC to circuit A61. Circuit A61 splices to the
50. 8W - 30 - 2 8W-30 FUEL/IGNITION ZJ
generator field terminal, fuel injectors, and ignition IGNITION COIL
coil. Circuit A61 also connects to cavity 57 of the When the Automatic Shut Down (ASD) relay con-
PCM. tacts close, they connect circuits A5 and A61. Circuit
A61 splices to supply voltage to the ignition coil. The
HELPFUL INFORMATION PCM controls the ground path for the ignition coil on
• Circuit A5 originates at fuse 15 in the PDC and circuit K19. Circuit K19 connects to cavity 19 of the
continues through fuse 2 in the PDC. Circuit A5 also PCM.
connects to cavity 3 of the PCM.
• Circuit F86 also connects to cavity 9 of the PCM. HELPFUL INFORMATION
Circuit A61 splices to supply voltage to the fuel in-
BATTERY FEED jectors, ignition coil, PCM, and generator.
Circuit A5 from fuse 15 in the Power Distribution
Center (PDC) supplies battery voltage to cavity 3 of FUEL PUMP RELAY
the Powertrain Control Module (PCM). When the ignition switch is in either the START or
RUN positions, it connects circuit A1 from fuse 12 in
HELPFUL INFORMATION
the Power Distribution Center (PDC) to circuit A21.
• Circuit A5 originates at fuse 15 in the PDC and
Circuit A21 supplies battery voltage to fuse 6 in the
continues through fuse 2 in the PDC. Circuit A5 con-
nects to cavity 3 of the PCM and supplies battery PDC.
voltage to the contact sides of the fuel pump relay From fuse 6, circuit F86 supplies power to the coil
and Automatic Shut Down (ASD) relay. side of the fuel pump relay. At the fuel pump relay,
circuit F86 is double pinned and supplies power to
FUEL INJECTORS the coil side of the Automatic Shut Down (ASD) re-
When the Automatic Shut Down (ASD) relay con- lay. The Powertrain Control Module (PCM) provides
tacts close, they connect circuits A5 and A61. Circuit ground for the coil sides of the fuel pump relay and
A61 supplies voltage to the fuel injectors. Each injec- ASD relay on circuit K81. Circuit K81 connects to
tor has a separate ground circuit controlled by the cavity 51 of the PCM.
PCM. When the PCM grounds the fuel pump relay, con-
Circuit K11 provides ground for injector number tacts inside the relay close and connect circuit A5
one. The K11 circuit connects to cavity 16 of the from fuse 15 in the PDC to circuit A64. Circuit A64
PCM. connects to the fuel pump (part of the in-tank fuel
Circuit K12 provides ground for injector number pump module) and the heated oxygen sensor.
two. The K12 circuit connects to cavity 15 of the
PCM. HELPFUL INFORMATION
Circuit K13 provides ground for injector number • Circuit A5 originates at fuse 15 in the PDC and
three. The K13 circuit connects to cavity 14 of the branches to fuse 2 in the PDC. From fuse 2, circuit
PCM. A5 connects to the contact side of the ASD relay. Cir-
Circuit K14 provides ground for injector number cuit A5 also connects to cavity 3 of the PCM.
four. The K14 circuit connects to cavity 13 of the
PCM. FUEL PUMP MODULE
Circuit K38 provides ground for injector number
five. The K38 circuit connects to cavity 38 of the FUEL PUMP MOTOR
PCM. When the fuel pump relay contacts close, the relay
Circuit K58 provides ground for injector number supplies voltage to the fuel pump motor. Circuit A64
six. The K58 circuit connects to cavity 58 of the from the relay supplies voltage to the fuel pump mo-
PCM. tor. Circuit Z1 provides ground for the fuel pump mo-
On 5.2L engines, circuit K17 provides ground for tor.
injector number seven. The K17 circuit connects to
cavity 17 of the PCM. FUEL LEVEL SENSOR
On 5.2L engines, circuit K18 provides ground for The fuel level sensor is a variable resistor. Circuit
injector number eight. The K18 circuit connects to G44 connects the fuel level sensor to the overhead
cavity 18 of the PCM. console. Circuit K102 connects the fuel level sensor
to the fuel gauge in the instrument cluster. Circuit
HELPFUL INFORMATION
F87 from fuse 21 in the fuse block supplies voltage to
• Circuit A61 splices to supply voltage to the fuel in-
jectors, ignition coil, PCM, generator. the fuel gauge. Circuit Z2 provides the ground path
• For information about fuel injector operation, refer for the fuel level sensor.
to Group 14.
51. ZJ 8W-30 FUEL/IGNITION 8W - 30 - 3
HELPFUL INFORMATION Circuit K41 delivers the signal from the heated ox-
As current flows through the coils in the fuel ygen sensor to the PCM. Circuit K41 connects to cav-
gauge, it creates a magnetic field. One of the coils in ity 41 of the PCM.
the gauge receives fixed current. The other coil is The PCM provides a ground for the heated oxygen
connected to the level sensor. The magnetic field con- sensor signal (circuit K41) through circuit K4. Circuit
trols the position of the fuel gauge pointer. K4 connects to cavity 4 of the PCM connector.
The fuel level sensor contains a variable resistor. Circuit Z12 provides ground for the heater circuit
As the position of the float arm on the fuel level sen- in the sensor.
sor changes, the resistor changes the current flow
through second coil in the fuel gauge. A change in HELPFUL INFORMATION
current flow alters the magnetic field in the fuel • Circuit A64 also supplies battery voltage to the in-
gauge, which changes the pointer position. Refer to tank fuel pump.
Group 8E, Instrument Panel and Gauges for addi- Circuit K4 splices to supply ground for the signals
tional information. from the following:
• Heated oxygen sensor
IDLE AIR CONTROL (IAC) MOTOR • Camshaft position sensor
The Powertrain Control Module (PCM) operates • Crankshaft position sensor
the idle air control motor through 4 circuits - K39, • Intake air temperature sensor
K40, K59, and K60. Each circuit connects to separate • Throttle position sensor
cavities in the PCM connector. • Manifold absolute pressure sensor
• Circuit K39 connects to cavity 59 of the PCM • Engine coolant temperature sensor
• Circuit K40 connects to cavity 40 of the PCM • Vehicle speed sensor
• Circuit K59 connects to cavity 60 of the PCM
• Circuit K60 connects to cavity 39 of the PCM CAMSHAFT POSITION SENSOR
The Powertrain Control Module (PCM) supplies 8
VEHICLE SPEED SENSOR volts to the camshaft position sensor (in distributor)
Circuit K25 supplies 8 volts from the Powertrain on circuit K25. Circuit K25 connects to cavity 7 of
Control Module (PCM) to the vehicle speed sensor. the PCM.
The K25 circuit connects to cavity 7 of the PCM. The PCM receives the camshaft position sensor sig-
Circuit G7 from the vehicle speed sensor provides nal on circuit K24. Circuit K24 connects to cavity 44
an input signal to the PCM. The G7 circuit connects of the PCM.
to cavity 47 of the PCM. The PCM provides a ground for the camshaft posi-
The PCM provides a ground for the vehicle speed tion sensor signal (circuit K24) through circuit K4.
sensor signal (circuit G7) through circuit K4. Circuit Circuit K4 connects to cavity 4 of the PCM.
K4 connects to cavity 4 of the PCM.
HELPFUL INFORMATION
HELPFUL INFORMATION • Circuit K25 splices to supply 8 volts to the crank-
• Circuit G7 splices to the speedometer, and vehicle shaft position sensor and the vehicle speed sensor.
information center. Circuit K4 splices to supply ground for the signals
• Circuit K25 splices to supply 8 volts to the cam- from the following:
shaft position sensor and crankshaft position sensor. • Heated oxygen sensor
Circuit K4 splices to supply ground for the signals • Camshaft position sensor
from the following: • Crankshaft position sensor
• Heated oxygen sensor • Intake air temperature sensor
• Camshaft position sensor • Throttle position sensor
• Crankshaft position sensor • Manifold absolute pressure sensor
• Throttle position sensor • Engine coolant temperature sensor
• Manifold absolute pressure sensor • Vehicle speed sensor
• Engine coolant temperature sensor
• Intake air temperature sensor CRANKSHAFT POSITION SENSOR
The Powertrain Control Module (PCM) supplies 8
HEATED OXYGEN SENSOR volts to the crankshaft position sensor on circuit K25.
When the fuel pump relay contacts close, they con- Circuit K25 connects to cavity 7 of the PCM.
nect circuits A5 and A64. Circuit A64 supplies volt- The PCM receives the crankshaft position sensor
age to the heated oxygen sensor. signal on circuit K27. Circuit K27 connects to cavity
24 of the PCM.
52. 8W - 30 - 4 8W-30 FUEL/IGNITION ZJ
The PCM provides a ground for the crankshaft po- Circuit K6 splices to supply 5 volts to the manifold
sition sensor (circuit K27) through circuit K4. Circuit absolute pressure sensor.
K4 connects to cavity 4 of the PCM. On vehicles equipped with the 4.0L engine and au-
tomatic transmission, circuit K22 splices to the
HELPFUL INFORMATION transmission control module.
• Circuit K25 splices to supply 8 volts to the cam- Circuit K4 splices to supply ground for the signals
shaft position sensor and the vehicle speed sensor. from the following:
Circuit K4 splices to supply ground for the signals • Heated oxygen sensor
from the following: • Camshaft position sensor
• Heated oxygen sensor • Crankshaft position sensor
• Camshaft position sensor • Intake air temperature sensor
• Crankshaft position sensor • Throttle position sensor
• Intake air temperature sensor • Manifold absolute pressure sensor
• Throttle position sensor • Engine coolant temperature sensor
• Manifold absolute pressure sensor • Vehicle speed sensor
• Engine coolant temperature sensor
• Vehicle speed sensor MANIFOLD ABSOLUTE PRESSURE SENSOR
From the Powertrain Control Module (PCM), cir-
ENGINE COOLANT TEMPERATURE SENSOR
cuit K6 supplies 5 volts to the manifold absolute
The engine coolant temperature sensor provides an
pressure (MAP) sensor. Circuit K6 connects to cavity
input to the Powertrain Control Module (PCM) on
6 of the PCM.
circuit K2. From circuit K2, the engine coolant tem-
perature sensor draws up to 5 volts from the PCM. Circuit K70 delivers the MAP signal to the PCM.
The sensor is a variable resistor. As coolant temper- Circuit K70 connects to cavity 1 of the PCM.
ature changes, the resistance in the sensor changes, The PCM provides a ground for the MAP sensor
causing a change in current draw. The K2 circuit signal (circuit K70) through circuit K4. Circuit K4
connects to cavity 2 of the PCM. connects to cavity 4 of the PCM.
The PCM provides a ground for the engine coolant
temperature sensor signal (circuit K2) through circuit HELPFUL INFORMATION
K4. Circuit K4 connects to cavity 4 of the PCM con- Refer to Group 14 for MAP sensor operation.
nector. Circuit K6 splices to supply 5 volts to the throttle
position sensor.
HELPFUL INFORMATION Circuit K4 splices to supply ground for the signals
Circuit K4 splices to supply ground for the signals from the following:
from the following: • Heated oxygen sensor
• Heated oxygen sensor • Camshaft position sensor
• Camshaft position sensor • Crankshaft position sensor
• Crankshaft position sensor • Intake air temperature sensor
• Intake air temperature sensor • Throttle position sensor
• Throttle position sensor • Manifold absolute pressure sensor
• Manifold absolute pressure sensor • Engine coolant temperature sensor
• Engine coolant temperature sensor • Vehicle speed sensor
• Vehicle speed sensor
INTAKE AIR TEMPERATURE SENSOR
THROTTLE POSITION SENSOR
The intake air temperature sensor provides an in-
From the Powertrain Control Module (PCM), cir-
put to the Powertrain Control Module (PCM) on cir-
cuit K6 supplies 5 volts to the throttle position sen-
cuit K21. Circuit K21 connects to cavity 21 of the
sor (TPS). Circuit K6 connects to cavity 6 of the
PCM.
PCM.
Circuit K22 delivers the TPS signal to the PCM. From circuit K21, the intake air temperature sen-
Circuit K22 connects to cavity 22 of the PCM. sor draws voltage from the PCM. The sensor is a
The PCM provides a ground for the throttle posi- variable resistor. As intake air temperature changes,
tion sensor signal (circuit K22) through circuit K4. the resistance in the sensor changes, causing a
Circuit K4 connects to cavity 4 of the PCM. change in current draw.
The PCM provides a ground for the intake air tem-
HELPFUL INFORMATION perature sensor signal (circuit K21) through circuit
Refer to Group 14 for throttle position sensor oper- K4. Circuit K4 connects to cavity 4 of the PCM.
ation.
53. ZJ 8W-30 FUEL/IGNITION 8W - 30 - 5
HELPFUL INFORMATION tor lamp on circuit G3. The MIL displays the mes-
Circuit K4 splices to supply ground for the signals sage CHECK ENGINE when illuminated. Circuit G3
from the following: connects to cavity 32 of the PCM.
• Heated oxygen sensor
• Camshaft position sensor DATA LINK CONNECTOR
• Crankshaft position sensor Circuit F86 supplies battery voltage to the data
• Intake air temperature sensor link connector. Circuit F86 originates at fuse 6 in the
• Throttle position sensor Power Distribution Center (PDC).
• Manifold absolute pressure sensor Circuit A21 from the ignition switch powers fuse 6
• Engine coolant temperature sensor when the switch is in the START or RUN positions. In
• Vehicle speed sensor the START or RUN position the ignition switch connects
circuit A1 from fuse 12 in the PDC with circuit A21.
EVAP/PURGE SOLENOID Circuit D84 connects to cavity 25 of the PCM. Cir-
Circuit F86 supplies voltage to the EVAP/Purge so- cuit D84 is the SCI receive circuit for the PCM.
lenoid. This circuit is HOT in the START and RUN Circuit D83 connects to cavity 45 of the PCM. Cir-
positions only. Circuit F86 also splices to provide cuit D83 is the SCI transmit circuit for the PCM.
Circuit Z12 provides ground for the data link con-
power to the data link connector, overdrive solenoid,
nector. Circuit Z12 also connects to cavities 5, 11 and
TCC solenoid, and EGR solenoid (5.2L engine only).
12 of the PCM to provide the power (device) ground.
Circuit F86 is protected by a 15 amp fuse located
in cavity 6 of the Power Distribution Center (PDC). HELPFUL INFORMATION
The Powertrain control Module (PCM) controls the • Circuit Z12 also supplies a ground for the PCM
ground path for the solenoid on circuit K52. Circuit high current drivers.
K52 connects to cavity 52 of the PCM connector. • If the system loses ground for the Z12 circuits, the
vehicle will not operate.
EXHAUST GAS RECIRCULATION SOLENOID—5.2L • Circuit F86 splices to supply battery voltage to the
ENGINE heated rear window switch, overdrive switch, vehicle
Circuit F86 supplies voltage to the EGR solenoid. theft alarm module and rear lighting system. Circuit
This circuit is HOT in the START and RUN positions F86 also powers the coil side of the Automatic Shut
only. Circuit F86 also splices to provide power to the Down relay and fuel pump relay.
data link connector, overdrive solenoid and TCC sole-
noid, and the EVAP/Purge solenoid. BRAKE SWITCH INPUT
Circuit F86 is protected by a 15 amp fuse located Circuit L53 provides the brake switch input to the
in cavity F6 of the Power Distribution Center (PDC). PCM. Circuit L53 connects to cavity 29 of the PCM.
The Powertrain Control Module (PCM) controls the
ground path for the solenoid on circuit K35. Circuit POWER (DEVICE) GROUND
K35 connects to cavity 35 of the PCM connector. Circuit Z12 connects to cavities 5, 11 and 12 of the
PCM. The Z12 circuit provides ground for PCM inter-
PARK/NEUTRAL POSITION SWITCH nal drivers that operate high current devices like the
When closed, the case-grounded park/neutral posi- injectors and ignition coil.
tion switch provides a ground path on circuit T41 for Internal to the PCM, the power (device) ground cir-
the coil side of the starter motor relay. Circuit A41 cuit connects to the PCM sensor return circuit (from
from the ignition switch provides battery voltage to circuit K4).
the coil side of the relay.
Circuit T41 splices to cavity 30 of the PCM. The HELPFUL INFORMATION
park/neutral position switch provides an input to the • If the system loses ground for the Z12 circuits, the
Powertrain Control Module (PCM). vehicle will not operate. Check the connection at the
ganged-ground circuit eyelet.
TACHOMETER SIGNAL
The Powertrain Control Module (PCM) supplies the CCD BUS
signal for the tachometer on circuit G21. Circuit G21 On vehicles equipped with the 4.0L engine, circuits
connects to cavity 43 of the PCM. The Transmission D1 and D2 connect the Powertrain Control Module
Control Module (TCM) also receives the tachometer (PCM) to the CCD Bus. Circuit D1 connects to cavity 26
signal from the PCM. of the PCM. Circuit D2 connects to cavity 46 of the
PCM. Circuits D1 and D2 are a twisted pair of wires.
MALFUNCTION INDICATOR LAMP (MIL) Both circuits D1 and D2 connect to the second data
The Powertrain Control Module (PCM) provides link connector located behind left from side of the
ground for the instrument cluster malfunction indica- center console.
81. ZJ 8W-31 TRANSMISSION CONTROLS 8W - 31 - 1
TRANSMISSION CONTROLS
OVERDRIVE SWITCH Circuit A14 from fuse 3 in the Power Distribution
Vehicles equipped with an automatic transmission Center (PDC) supplies battery voltage to the Transmis-
may have an overdrive switch. The operator disables sion Control Module (TCM). Circuit A5 from fuse 15 in
or enables overdrive when the switch is depressed. the PDC supplies voltage to circuit A14 through PDC
The overdrive system consists of a switch connected fuse 3.
to the Powertrain Control Module (PCM) and an over- When the ignition switch is in the START or RUN
drive ON/OFF indicator lamp. position, circuit A1 from fuse 12 in the PDC connects
If overdrive is currently enabled, it is disabled when to circuit A21. Circuit A21 feeds circuit F86 through
the operator depresses the overdrive switch. Conversely, fuse 6 in the PDC. Circuit F86 connects to the TCM.
if the operator already disabled overdrive, it is enabled The TCM receives the Throttle Position Sensor
when the switch is depressed. The overdrive lamp illu- (TPS) signal on circuit K22. On circuit G7 the TCM
minates when overdrive is disabled. receives the vehicle speed sensor signal. The Power-
Circuit T9 from the overdrive switch connects to the train Control Module (PCM) supplies 8 volts to the
Transmission Control Module (TCM) on vehicles vehicle speed sensor on circuit K25 and 5 volts to the
equipped with 4.0L engines or the Powertrain Control TPS on circuit K6. Circuit K4 from the PCM provides
Module (PCM) on vehicles equipped with 5.2L en- ground for the signals from both sensors.
gines. Circuit T9 provides the overdrive signal. Cir- The TCM provides voltage and ground for the over-
cuit Z1 provides ground for the switch. drive solenoid, electronic governor, and Torque Con-
In the START and RUN position, the ignition switch verter Clutch (TCC) solenoid. Circuit T20 from the TCM
connects circuit A1 from fuse 12 in the Power Distribu- supplies voltage. The TCM provides ground for the over-
tion Center (PDC) with circuit A21. Circuit A21 powers drive solenoid on circuit T60, the electronic governor on
circuit F87 through fuse 21 in the fuse block. Circuit F87 circuit T59 and the TCC solenoid on circuit T22.
supplies battery voltage for the overdrive lamp. On circuit T33, the TCM supplies 5 volts to the
On vehicles equipped with 4.0L engines, the TCM transmission temperature sensor, and the governor
turns the overdrive ON/OFF indicator lamp ON or OFF pressure sensor. The ground path for the sensors is on
by providing a ground for the lamp on circuit G68. circuit T35 to the TCM.
On vehicles equipped with 5.2L engines, the PCM Circuits D5 and D82 from the TCM connect to the
turns the overdrive ON/OFF indicator lamp ON or OFF data link connector. Circuit Z1 provides ground for
by providing a ground for the lamp on circuit G68. the data link connector and TCM. Circuit A14 sup-
plies voltage to the connector for the scan tool.
HELPFUL INFORMATION
The overdrive lamp is a Light Emitting Diode UPSHIFT LAMP
(LED). On vehicles equipped with a manual transmission,
the PCM grounds the up-shift lamp on circuit K54.
OVERDRIVE SOLENOID AND TORQUE CONVERTER Circuit K54 connects to cavity 54 of the PCM.
CLUTCH (TCC) SOLENOID—5.2L ENGINE
The overdrive solenoid and Torque Converter DIAGRAM INDEX
Clutch (TCC) solenoid are molded together. Circuit
F86 supplies voltage to both solenoids. The Power- Component Page
train Control Module (PCM) provides ground for the Data Link Connector . . . . . . . . . . . . . . . . . . . . . . .8W-31-2
overdrive solenoid on circuit T60. Refer to Overdrive Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . .8W-31-2, 5, 6
Switch in this section. Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . .8W-31-6
The Powertrain Control Module (PCM) provides Overdrive Switch . . . . . . . . . . . . . . . . . . . . . . .8W-31-5, 6
ground for the TCC solenoid on circuit T6. Overdrive and TCC Solenoids . . . . . . . . . . . . . . . . .8W-31-6
Power Distribution Center (PDC) . . . . . . . . . . . .8W-31-2, 5, 6
TRANSMISSION CONTROL MODULE—4.0L Powertrain Control Module . . . . . . . . . . . . . . .8W-31-4, 5, 6
Throttle Position Sensor . . . . . . . . . . . . . . . . . . . .8W-31-4
ENGINE Transmission Control Module . . . . . . . . . . . . .8W-31-2 thru 5
The Transmission Control Unit (TCM) operates the Transmission Output Speed Sensor . . . . . . . . . . . . .8W-31-5
42RE transmission used with 4.0L engines. The TCM Transmission Solenoid Assembly . . . . . . . . . . . . . . .8W-31-3
controls the electronic governor, overdrive solenoid, Vehicle Speed Sensor . . . . . . . . . . . . . . . . . . . . . .8W-31-4
and Torque Convertor Clutch (TCC) solenoid.
82.
83.
84.
85.
86.
87. ZJ 8W-32 ANTI-LOCK BRAKES 8W - 32 - 1
ANTI-LOCK BRAKES
INDEX
page page
ABS Pump Motor Relay . . . . . . . . . . . . . . . . ........... 1 Diagram Index . . . . . . . . . .... . . . . . . . . . . ........... 2
ABS System Relay . . . . . . . . . . . . . . . . . . . ........... 1 General Information . . . . . .... . . . . . . . . . . ........... 1
ABS Warning Lamp . . . . . . . . . . . . . . . . . . . ........... 2 Hydraulic Control Unit . . . .... . . . . . . . . . . ........... 2
Acceleration Switch . . . . . . . . . . . . . . . . . . . ........... 1 Pump Motor Speed Sensor ... . . . . . . . . . . ........... 2
Brake Switch Input . . . . . . . . . . . . . . . . . . . ........... 2 Wheel Speed Sensors . . . .... . . . . . . . . . . ........... 1
Data Link Connector . . . . . . . . . . . . . . . . . . ........... 2
GENERAL INFORMATION Circuits B4 and B3 provide signals to ABS control
Three fuses supply power for the Anti-Lock Brake module from the left rear wheel speed sensor. Circuit
System (ABS); fuses 7 (40 amp) and 9 (20 amp) in B3, which provides the LOW signal, connects to cavity
the Power Distribution Center (PDC) and fuse 15 (3 28 of the ABS control module. Circuit B4 connects to
amp) in the fuse block. Fuses 7 and 9 in the PDC are cavity 46 of the module and provides the HIGH signal.
connected directly to battery voltage and are HOT all
times. Fuse 15 in the fuse block is HOT when the ig- ACCELERATION SWITCH
nition switch is the RUN Position. During four-wheel drive operation, the acceleration
In the RUN position, the ignition switch connects switch provides deceleration data to the ABS control
circuit A2 from fuse 13 in the PDC with circuit A22. module. Refer to Group 5, Brakes for additional infor-
Circuit A22 connects to a bus bar in the fuse block. mation.
The bus bar feeds circuit 236 through fuse 15. Circuits B41, B42, and B43 connect the accelera-
Circuit 236 connects to the coil side of the ABS sys- tion sensor to the ABS control module. Circuits B41
tem relay and cavity 53 of the ABS control module. and B42 provide switch states while circuit B43 pro-
Circuit Z1 provides ground for the ABS control vides ground. At the ABS control module, circuit B41
module. Circuit Z1 connects to cavities 1 and 19 of connects to cavity 25, circuit B42 connects to cavity
the ABS control module. 43 and circuit B43 connects to cavity 26.
Refer to group 5, Brakes for operational descrip-
tions of ABS system components. ABS SYSTEM RELAY
The ABS system relay is located in the Power Distri-
WHEEL SPEED SENSORS bution Center (PDC). When the ABS module grounds
The all wheel anti-lock system uses four wheel the ABS system relay on circuit 207, the relay switches
speed sensors; one for each wheel. Each sensor con- to connect circuit A20 from PDC fuse 9 to circuit 235.
Circuit 236 from fuse 7 in the fuse block feeds the coil
verts wheel speed into an electrical signal that it
side of the ABS system relay. Circuit 207 connects to
transmits to the ABS control module. A pair of
cavity 34 of the ABS control module.
twisted wires connect to each sensor to provide sig-
Circuit 235 is double crimped at the ABS system re-
nals to the ABS control module.
lay. One branch of circuit 235 supplies power to the coil
Circuits B6 and B7 provide signals to ABS control side of the ABS pump motor relay. The other branch of
module from the right front wheel speed sensor. Circuit circuit 235 splices to cavities 3 and 33 of the ABS con-
B6 which provides the LOW signal connects to cavity 29 trol module and to the hydraulic control unit.
of the ABS control module. Circuit B7 connects to cavity
47 of the module and provides the HIGH signal. ABS PUMP MOTOR RELAY
Circuits B8 and B9 provide signals to ABS control The ABS pump motor relay in the Power Distribution
module from the left front wheel speed sensor. Circuit Center (PDC) supplies voltage to the ABS pump motor.
B8, which provides the HIGH signal, connects to cavity When the ABS power relay energizes, circuit 235 sup-
30 of the ABS control module. Circuit B9 connects to plies battery voltage to the coil side of the ABS pump
cavity 48 of the module and provides the LOW signal. motor relay. The ABS control module provides ground
Circuits B1 and B2 provide signals to ABS control for the relay on circuit B116. Circuit B116 connects to
module from the right rear wheel speed sensor. Cir- cavity 15 of the ABS control module.
cuit B1 which provides the HIGH signal connects to When the ABS pump motor energizes, it connects
cavity 45 of the ABS control module. Circuit B2 con- circuit A10 from PDC fuse 7 to circuit B120. Circuit
nects to cavity 27 of the module and provides the B120 supplies battery voltage to the pump motor.
LOW signal. Circuit Z1 provides ground for the pump motor.
