engine JEEP CHEROKEE 1995 Service Repair Manual

MALFUNCTION INDICATOR (CHECK ENGINE)
LAMP
The Powertrain Control Module (PCM) provides
ground for the malfunction indicator (Check Engine)
lamp on circuit G3. Circuit G3 connects to cavity 32
of the PCM. Circuit G5 connects to the instrument
cluster and supplies battery voltage for the malfunc-
tion indicator lamp. When illuminated, the malfunc-
tion indicator lamp displays the message CHECK
ENGINE.
For information regarding diagnostic trouble code
access using the malfunction indicator lamp, refer to
Group 14, Fuel Systems.
UP-SHIFT LAMP
On vehicles equipped with a manual transmission,
the Powertrain Control Module (PCM) provides
ground for the Up-Shift lamp on circuit K54. Circuit
G5 provides battery voltage for the lamp.
ABS WARNING LAMP
Circuit G5 provides power for the ABS warning
lamp at the instrument cluster. Ground for the ABS
warning lamp is provided by either the ABS control
module or by the ABS power relay when the relay is
not energized. The ABS control module illuminates
the lamp by providing ground on circuit G19.
Circuit G19 splices to connect to circuit B15
through a diode. When the ABS power relay is not
energized, it connects circuit B15 to circuit Z12. The
ground path for the warning lamp is provided
through the diode to circuit B15, through the ABS
power relay to ground on circuit Z12.
The diode between circuit G19 and B15 prevents
voltage from flowing to the ABS control module when
the ABS power relay switches to supply power on cir-
cuit B15.
BRAKE WARNING LAMP
Circuit G5 provides battery voltage for the brake
warning lamp. Circuit G11 can provide ground for
the lamp in 3 ways. The first ground path is through
the ignition switch when the key is in the START po-
sition.
The second ground path for the brake warning
lamp on circuit G11 is through the case grounded
brake warning switch. When the switch closes it pro-
vides a ground.
The third ground path on circuit G11 is through
the case grounded park brake switch. When the
switch closes it provides ground.
HIGH BEAM INDICATOR LAMP
Circuit G34 supplies power for the high-beam indi-
cator lamp when the operator either flashes the opti-
cal horn (high beams) or selects high beam operation.
Circuit Z1 provides the ground path for the lamp.
Circuit L3 from the headlamp switch powers the
high beam circuits of the headlamps. On vehicles not
equipped with Daytime Running Lamps (DRL), cir-
cuit G34 double crimps to circuit L3 at the bulkhead
connector.
On vehicles equipped with DRL, circuit L3 splices
to the DRL module. The DRL module powers circuit
G34.
TURN SIGNAL INDICATOR LAMPS
Circuit L61 supplies battery voltage to the left turn
signal indicator lamp. The right turn signal indicator
lamp receives battery voltage from circuit L60. The
turn signal/hazard flasher switch powers circuits L60
and L61. Circuit Z1 provides ground for the lamps.
HELPFUL INFORMATION
²If the warning lamps, gauges and indicator lamps
don't operate, check fuse 4 in the PDC and fuse 9 in
the fuse block.
²If the illumination lamps don't operate, check fuse
10 in the fuse block.
DIAGRAM INDEX
Component Page
4WD Switch............................8W-40-9
ABS Control Module......................8W-40-5
Brake Warning Switch.....................8W-40-5
Combination Buzzer.....................8W-40-7, 8
Daytime Running Lamp (DRL) Module.........8W-40-4, 6
Engine Coolant Temperature Sensor...........8W-40-7, 8
Engine Oil Pressure Sensor..................8W-40-9
Fuse 3 (PDC).......................8W-40-3, 7, 8
Fuse 4 (PDC).......................8W-40-4, 7, 8
Fuse 7 (PDC)...........................8W-40-6
Fuse 8 (Fuse Block)...................8W-40-3, 7, 8
Fuse 9 (Fuse Block).......................8W-40-8
Fuse 10 (Fuse Block).................8W-40-3, 7, 10
Gauge Package......................8W-40-7, 8, 9
Headlamp Switch...................8W-40-3, 6, 7, 8
Headlamp Dimmer Switch...................8W-40-6
Ignition Switch......................8W-40-4, 5, 8
Instrument Cluster...................8W-40-3 thru 9
Panel Lamp Dimmer Switch..............8W-40-3, 7, 8
Park Brake Switch........................8W-40-5
Powertrain Control Module.................8W-40-4, 5
8W - 40 - 2 8W-40 INSTRUMENT CLUSTERÐYJ VEHICLESJ

AIR CONDITIONING AND HEATER
GENERAL INFORMATION
On vehicles built with the 2.5L engine, the electri-
cal system has provisions for dealer installed air con-
ditioning. The provisions consist of two connectors
which include circuitry for:
²Circuit C1 - Ignition feed
²Circuit C21 - Blower motor switch
²Circuit C91 - A/C request signal
²Circuit C20 - A/C select signal
²Circuit C13 - Ground for coil side of A/C compres-
sor clutch relay
²Circuit G5 - Battery voltage for coil side of A/C
compressor clutch relay
A/C COMPRESSOR
When the ignition switch is in the RUN position it
connects circuit A1 from fuse 4 in the Power Distri-
bution Center (PDC) to circuit A22. Circuit A22 sup-
plies battery voltage to fuse 12 in the fuse block.
Fuse 12 powers circuit C1.
Circuit C1 supplies battery voltage to the A/C
blower switch. Circuit C21 connects the A/C blower
switch to the A/C low pressure switch.
When the operator selects A/C operation, the A/C
blower switch provides the A/C request signal to cav-
ity 27 of the Powertrain Control Module (PCM) on
circuit C91. At the same time, the blower switch sup-
plies voltage through the A/C thermostat to circuit
C21.
Circuit C21 supplies voltage to the A/C low pres-
sure switch. When the A/C low pressure switch
closes, circuit C20 provides battery voltage to the
contact side of the A/C compressor clutch relay and
provides the A/C select signal to the PCM. Circuit
C20 is double crimped at the contact side of the re-
lay. The C20 circuit branch from the relay supplies
the A/C select input to cavity 28 of the PCM.
After receiving the A/C request signal, the PCM en-
ergizes the A/C compressor clutch relay by providing
ground for the coil side of the relay on circuit C13.
Circuit C13 connects to cavity 34 of the PCM.
Circuit G5 from fuse 9 in the fuse block supplies
voltage to the coil side of the relay. In the START or
RUN positions the ignition switch connects circuit A1
from fuse 4 in the PDC with circuit A21. Circuit A21
connects to the fuse block bus bar that powers circuit
C5 through fuse 9.
When the PCM energizes the A/C compressor
clutch relay, the relay switches from its normally
grounded position to connect circuit C20 to circuit
C3. Circuit C3 supplies voltage to the case grounded
A/C compressor clutch.
HELPFUL INFORMATION
²Circuit G5 is double crimped at the coil side of the
A/C compressor clutch relay. The G5 branch from the
relay continues to the back-up lamp switch.
²Circuit Z1 provides ground for the A/C compressor
clutch relay when the relay is in its normally
grounded position.
A/C-HEATER BLOWER MOTOR
When the ignition switch is in the RUN position it
connects circuit A1 from fuse 4 in the Power Distri-
bution Center (PDC) to circuit A22. Circuit A22 sup-
plies battery voltage to fuse 12 in the fuse block.
Fuse 12 powers circuit C1.
Circuit C1 supplies battery voltage to the A/C
blower switch. In the LOW position, the A/C blower
switch supplies voltage to the low speed brush of the
blower motor. In the MEDIUM position, the switch
supplies voltage to the medium speed bush of the
blower motor. In the HIGH position, the switch sup-
plies voltage to the high speed brush of the blower
motor.
The blower motor has a field jumper. The ground
circuit for the blower motor connects to the cigar
lighter. Circuit Z1 provides ground for the blower mo-
tor and the cigar lighter.
HELPFUL INFORMATION
²Check fuse 4 in the PDC.
²Check fuse 12 in the fuse block.
DIAGRAM INDEX
Component Page
A/C Compressor Clutch.....................8W-42-4
A/C Compressor Clutch Relay................8W-42-4
A/C Thermostat..........................8W-42-5
Blower Motor...........................8W-42-5
Blower Motor Switch......................8W-42-5
Fuse 4 (PDC).........................8W-42-4, 6
Fuse 7 (Fuse Block).......................8W-42-6
Fuse 9 (Fuse Block).....................8W-42-4, 6
Fuse 12 (Fuse Block)....................8W-42-4, 6
Ignition Switch........................8W-42-4, 6
Powertrain Control Module.................8W-42-4, 6
8W - 42 - 2 8W-42 AIR CONDITIONING/HEATERÐYJ VEHICLESJ

CONNECTOR PIN OUTS
GENERAL INFORMATION
The pages referenced in this section show the con-
nector, the circuits in the connector, and the pin thatcircuit occupies. Individual connector numbers are
referenced on diagram pages throughout Group 8W.
CONNECTOR LOCATIONS
Component Page
C101................................8W-80-3
C102................................8W-80-3
C103................................8W-80-3
C104................................8W-80-3
C105................................8W-80-3
C106................................8W-80-4
C107................................8W-80-4
C108................................8W-80-4
C109................................8W-80-4
C110................................8W-80-5
C111................................8W-80-6
C112................................8W-80-6
C113................................8W-80-6
C114...............................8W-80-7, 8
C115................................8W-80-9
C116................................8W-80-9
C117................................8W-80-9
C118................................8W-80-9
C119................................8W-80-9
C120................................8W-80-10
C121................................8W-80-10
C122................................8W-80-10
C123................................8W-80-10
C124................................8W-80-10
C125................................8W-80-11
C126................................8W-80-11
C127................................8W-80-11
C128................................8W-80-11
C129................................8W-80-11
C130................................8W-80-12
C131................................8W-80-12
C132................................8W-80-12
C133................................8W-80-12
C134................................8W-80-12
C135................................8W-80-13
C136................................8W-80-13
C137................................8W-80-13
C138................................8W-80-13
C139 (2.5L Engine)......................8W-80-14
C139 (4.0L Engine)......................8W-80-15
C140................................8W-80-16
C141................................8W-80-16
C142................................8W-80-16
C143................................8W-80-16
C144................................8W-80-16
C145................................8W-80-17
C146................................8W-80-17Component Page
C147................................8W-80-17
C148................................8W-80-17
C149................................8W-80-17
C150................................8W-80-18
C151................................8W-80-18
C152................................8W-80-18
C153................................8W-80-18
C154................................8W-80-19
C155................................8W-80-19
C156................................8W-80-19
C201................................8W-80-20
C202................................8W-80-20
C203................................8W-80-20
C204................................8W-80-20
C205................................8W-80-21
C206................................8W-80-21
C207................................8W-80-21
C208................................8W-80-21
C209................................8W-80-22
C210................................8W-80-22
C211................................8W-80-22
C212................................8W-80-22
C213................................8W-80-23
C214................................8W-80-23
C215................................8W-80-23
C216................................8W-80-23
C217................................8W-80-23
C218................................8W-80-24
C219................................8W-80-24
C220................................8W-80-24
C221................................8W-80-24
C222................................8W-80-24
C223................................8W-80-25
C224................................8W-80-25
C225................................8W-80-25
C226................................8W-80-25
C227................................8W-80-26
C228................................8W-80-26
C229................................8W-80-26
C230................................8W-80-26
C231................................8W-80-26
C232................................8W-80-27
C233................................8W-80-27
C301................................8W-80-27
C302................................8W-80-27
C303................................8W-80-28
C304................................8W-80-28
J8W-80 CONNECTOR PIN OUTSÐYJ VEHICLES 8W - 80 - 1

CONNECTOR LOCATIONS
GENERAL INFORMATION
This section provides illustrations identifying com-
ponent and connector locations in the vehicle. A con-nector index is provided. Use the wiring diagrams in
each section for connector number identification. Re-
fer to the index for the proper figure number.
CONNECTOR LOCATIONS
Connector # . Color . Location Fig.
C101......BK ...RTFender Side Shield..........1
C102......BK ...RTFender Side Shield Under PDC . .1
C103......BK ...RTFender Side Shield..........1
C104......BK ...LTSide of Battery on Cowl Panel . . .1
C105 2.5L . . . NAT . . RT Rear of Engine............3
C105 4.0L . . . NAT . . RT Rear of Engine............4
C106......BK ...AtLamp...................1
C107......NAT ..Center of Cowl Panel Near
Map Sensor...............1
C108......BK ...LTKick Panel Above Park Brake . . .8
C109......BK ...Under Drivers Seat............8
C110......BK ...Under I.P.Front of Floor Tunnel....6
C111......BK ...Under I.P.Front of Floor Tunnel....6
C112......BK ...Under I.P. RT of Stop Lamp Switch .7
C113......BK ...LTFender Side Shield..........1
C114......BK ...LTSide Cowl Panel............1
C115......BK ...LTFender Side Shield..........1
C116......BK ...LTFender Side Shield..........1
C117......BK ...LTFender Side Shield..........1
C118......BK ...Bottom of Washer Reservoir......2
C119......BK ...Near Bulkhead Disconnect
2.5L only..........Not Shown
C120 2.5L . . . BK . . . Rear of Generator.............3
C120 4.0L . . . BK . . . Rear of Generator.............5
C121 2.5L . . . BK . . . RT Rear of Engine............3
C121 4.0L . . . BK . . . Rear of Generator.............4
C122......BK ...OnReceiver/Drier.............4
C123 2.5L . . . BK . . . RT Side of Engine Rear of Distributor .3
C123 4.0L . . . BK . . . RT Side of Engine Rear of Distributor .4
C124 2.5L . . . BK . . . At End of Distributor Pig Tail.....3
C124 4.0L . . . BK . . . At End of Distributor Pig Tail.....4
C125......GY ...RTSide of Transmission........5
C126......BK ...LTRear of Transmission.........5
C127......BK ...TopofFuel Tank..............9
C128......BK ...TopofRear Cross-member.......9
C129......BK ...TopofRear Cross-member.......9
C130 2.5L . . . BK . . . On Thermostat Housing.........3
C130 4.0L . . . BK . . . On Thermostat Housing.........4
C131 2.5L . . . BK . . . LT Side of Engine Bottom of Intake .3
C131 4.0L . . . BK . . . LT Side of Engine Bottom of Intake .4
C132 2.5L . . . BK . . . Injector #1.................3
C132 4.0L . . . BK . . . Injector #1.................4
C133 2.5L . . . BK . . . Injector #2.................3
C133 4.0L . . . BK . . . Injector #2.................4
C134 2.5L . . . BK . . . Injector #3.................3
C134 4.0L . . . BK . . . Injector #3.................4
C135 2.5L . . . BK . . . Injector #4.................3
C135 4.0L . . . BK . . . Injector #4.................4Connector # . Color . Location Fig.
C136......BK ...Injector #5.................4
C137......BK ...Injector #6.................4
C138 2.5L . . . BK . . . Center of Dash Panel...........1
C138 4.0L . . . BK . . . Center of Dash Panel...........1
C139......BK ...Under Bulkhead LT Side of I.P.....1
C140 2.5L . . . GY . . . LT Rear of Intake.............3
C140 4.0L . . . GY . . . LT Rear of Intake.............4
C141 2.5L . . . BK . . . Rear of Throttle Body..........3
C141 4.0L . . . BK . . . Rear of Throttle Body..........4
C142 2.5L . . . BK . . . On Throttle Body.............3
C142 4.0L . . . BK . . . On Throttle Body.............4
C143 2.5L . . . BK . . . Rear of Intake...............3
C143 4.0L . . . BK . . . Rear of Intake...............4
C144......BK ...Above Bulkhead Disconnect.......1
C145......GY ...OnPower Steering Pump........3
C146......BK ...AtHeadlamp..........Not Shown
C147......YL ...AtSide Marker Lamp..........2
C148......BK ...AtPark/Turn Lamp......Not Shown
C149......BK ...RTSide Behind Bumper.........2
C150......BK ...LTSide Behind Bumper.........2
C151......BK ...AtPark/Turn Lamp............2
C152......YL ...AtSide Marker Lamp. . . .Not Shown
C153......BK ...AtHeadlamp................2
C154......BK ...LTFender Side Shield..........2
C155......BK ...Direct Connection to Horn.......2
C156......BK ...Bottom of Washer Reservoir......2
C201......BK ...LTSide of I.P...............7
C202......BK ...OnFuse Block...............7
C203......BK ...LTKick Panel................7
C204......BK ...LTKick Panel................7
C205......BK ...LTSide Kick Panel Under I.P......7
C206......BK ...AtSpeaker...........Not Shown
C207......BK ...LTofSteering Column Rear
of Cluster.................7
C208......BK ...LTSide of Steering Column......7
C209......BK ...Rear of Switch...............7
C210......BK ...Rear of Switch...............7
C211......BK ...Base of Steering Column........7
C212......BK ...AtWiper Motor..............7
C213......BK ...RTofSteering Column Under I.P. . .7
C214......BK ...RTSide of Cluster Bezel . .Not Shown
C215......BK ...Base of Steering Column........7
C216......BK ...Base of Steering Column........7
C217......BK ...RTSide of Brake Pedal Support . . .7
C218......BK ...Base of Steering Column........7
C219......BK ...Rear of Switch...............7
C220......BK ...Rear of Switch...............7
C221......BK ...Rear of Switch...............7
J8W-90 CONNECTOR LOCATIONSÐYJ VEHICLES 8W - 90 - 1

Connector # . Color . Location Fig.
C222......BK ...Rear of Switch...............6
C223......BK ...Rear of HVAC Switch...........6
C224......BK ...Rear of Radio...............6
C225......BK ...Rear Center of I.P.............6
C226......BK ...Rear of Glove Box LT Side.......6
C227......BK ...Under I.P Right Side...........6
C228......BK ...AtSpeaker...........Not Shown
C229......BK ...RTSide of HVAC Housing.......6
C230......BK ...RTSide of HVAC Housing.......6
C231......BK ...RTKick Panel.............6,7
C232......BK ...TopofI.P.Center Support.......7
C233......BK ...TopofI.P.Center Support.......7
C301......RD ...LTKick Panel................8
C302......BK ...AtBuckle..................8
C303......BK ...LTRear Quarter Panel..........8
C304......BK ...LTRear Quarter Panel..........8
C305......BK ...RTRear Quarter Panel..........8
C306......BK ...AtMotor............Not Shown
C307......BK ...LTSide of I.P. at Lamp.........6
C308......BK ...RTSide of I.P. at Lamp.........7
C309......BK ...AtCHMSL Lamp.......Not Shown
C310......BK ...AtCHMSL Lamp.......Not Shown
C401......BK ...TopofFuel Tank..............9Connector # . Color . Location Fig.
C402......BK ...RTSide of Axle........Not Shown
C403......BK ...RTSide of Roll Bar............8
C404......GY ...LTSide Front of Transmission.....5
C405......BK ...RTSide of Transmission........5
D101............ABSDiode Under I.P.Front of
Floor Tunnel...............6
D201............Taped In Harness Near Wiper
Switch T/O................6
G101............Left of Battery on Dash Panel.....1
G102............Center of Dash Panel...........1
G103 2.5L . .......Rear of Distributor............3
G103 4.0L . .......Rear of Generator.............4
G104 2.5L . .......RTSide of Engine.............3
G104 4.0L . .......RtSide of Engine.............4
G105............RTSide Radiator Closure Panel....2
G106............LTSide Radiator Closure Panel....2
G107............RTSide of Dash Panel.........1
G108 2.5L . .......RTRear of Engine............3
G108 4.0L . .......RTRear of Engine............4
G201.............AtCigar Lighter..............6
G202.............Rear of Radio...............6
8W - 90 - 2 8W-90 CONNECTOR LOCATIONSÐYJ VEHICLESJ

Fig. 1 Engine Compartment Connections YJ
J8W-90 CONNECTOR LOCATIONSÐYJ VEHICLES 8W - 90 - 3

Fig. 2 Engine Compartment Connections YJ
8W - 90 - 4 8W-90 CONNECTOR LOCATIONSÐYJ VEHICLESJ

Fig. 3 Engine Connections 2.5L YJ
J8W-90 CONNECTOR LOCATIONSÐYJ VEHICLES 8W - 90 - 5

Fig. 4 Engine Connections 4.0L YJ
8W - 90 - 6 8W-90 CONNECTOR LOCATIONSÐYJ VEHICLESJ

SPLICE LOCATIONS
GENERAL INFORMATION
This section provides illustrations identifying the
general location of the splices in this vehicle. A splice
index is provided. Use the wiring diagrams in each
section for splice number identification. Refer to the
index for the proper splice number.
SPLICE LOCATIONS
Splice
NumberLocations Fig.
S101 Near PDC T/O.....................1
S102 Near T/O for Engine Wiring.............1
S103 RT Dash Panel Near T/o for Ground.......1
S104 Near T/O for MAP Sensor..............1
S105 Near T/O for MAP Sensor..............1
S106 Left Side of MAP Sensor..............1
S107 In ABS Wiring T/O Near Grommet........1
S108 In ABS Wiring T/O Near Grommet........1
S109 Above Brake Booster.................1
S110 Rear of Generator...................3
S111 2.5L RT Side of Valve Cover...............4
S111 4.0L RT Side of Valve Cover...............3
S112 Near T/O for PRNDL Switch............5
S113 Between Inj #2 and Inj #3.............3
S114 Near T/O for Throttle Body Wiring........3
S115 Above Bulkhead Connector.............1
S116 Above Bulkhead Connector.............1
S117 Near Data Link T/O..................1
S118 Near Data Link T/O..................1
S119 Near Data Link T/O..................1
S120 4.0L RT Side of Valve Cover...............3
S121 2.5L RT Side of Valve Cover...............4
S122 Near T/O for RT PK/TURN Lamp.........2
S123 Near T/O for RT Fog Lamp.............2
S124 Near T/O for LT Fog Lamp.............2
S125 Near T/O for LT PK/TURN Lamp.........2Splice
NumberLocations Fig.
S126 Near T/O for Headlamp...............2
S127 Near T/O for Headlamp...............2
S128 Near T/O for Headlamp...............2
S129 Near Horn T/O.....................2
S201 Near T/O for Dimmer Switch............7
S202 Near T/O for Dimmer Switch............7
S203 Near T/O for Dimmer Switch............7
S204 Near T/O for Dimmer Switch............7
S205 Near T/O for Wiper Switch.............7
S206 Near T/O for Wiper Switch.............7
S207 Near Panel Illumination T/O.............7
S208 Near Panel Illumination T/O.............7
S209 Near Panel Illumination T/O.............7
S210 Near Panel Illumination T/O.............7
S211 Near T/O for Ignition Switch............7
S212 Near T/O for Ignition Switch............7
S213 Near T/O for Radio..................6
S301 Near T/O for Park Brake Switch..........8
S302 Near T/O for Park Brake Switch..........8
S303 Near Grommet LT Rear Quarter Panel......8
S304 Near LT Rear Tail Lamp T/O............8
S305 RT Rear Quarter Panel Near Tail Lamp.....8
S306 Near T/O for Dome Lamp.......Not Shown
S307 In CHMSL Jumper Harness......Not Shown
S308 In CHMSL Jumper Harness......Not Shown
J8W-95 SPLICE LOCATIONSÐYJ VEHICLES 8W - 95 - 1