2002 JEEP LIBERTY Bus

LEFT REAR DOOR SPEAKER-2WAY
CAV CIRCUIT FUNCTION
1 X51 18BR/YL (BASE) LEFT REAR DOOR SPEAKER (+)
1 X93 18WT/RD (PREMIUM) AMPLIFIED LOW LEFT REAR SPEAKER (+)
2 X57 18BR/LB (BASE) LEFT REAR DOOR SPEAKER (-)
2 X91 18WT (PREMIUM) AMPLIFIED LOW LEFT REAR SPEAKER (-)
LEFT REAR POWER WINDOW MOTOR (MIDLINE/HIGHLINE) - LT. GRAY 2 WAY
CAV CIRCUIT FUNCTION
1 Q23 16DG LEFT REAR WINDOW DRIVER DOWN
2 Q13 16GY LEFT REAR WINDOW DRIVER UP
LEFT REMOTE RADIO SWITCH (PREMIUM) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 X10 20RD/DB RADIO CONTROL MUX RETURN
2 X20 20RD/BK RADIO CONTROL MUX
LEFT SIDE IMPACT AIRBAG CONTROL MODULE (LSIACM) - YELLOW 8 WAY
CAV CIRCUIT FUNCTION
1 F14 18LG/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
2- -
3 R77 18YL/RD LEFT CURTAIN SQUIB LINE 2
4 R75 18YL/BK LEFT CURTAIN SQUIB LINE 1
5 Z104 18BK/YL GROUND
6- -
7- -
8 D25 18YL/VT PCI BUS
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-75

POWERTRAIN CONTROL MODULE-C3 (GAS) - LT. GRAY 32 WAY
CAV CIRCUIT FUNCTION
26 K226 18DB/WT FUEL LEVEL SENSOR SIGNAL
27 D21 18PK SCI TRANSMIT
28 - -
29 D32 18LG SCI RECEIVE (PCM)
30 D25 18YL/VT PCI BUS
31 - -
32 V37 18RD/LG SPEED CONTROL SWITCH SIGNAL
RADIATOR FAN MOTOR - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 C25 12YL RADIATOR FAN RELAY OUTPUT
2 Z212 12BK/OR GROUND
RADIATOR FAN RELAY - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 C24 12DB/PK FUSED B(+)
2 C25 12YL RADIATOR FAN RELAY OUTPUT
3 Z212 18BK/OR GROUND
4 K173 18LG RADIATOR FAN RELAY CONTROL
RADIO C1 - GRAY 22 WAY
CAV CIRCUIT FUNCTION
1 M1 20PK FUSED B(+)
2 F89 18OR/RD FUSED IGNITION SWITCH OUTPUT (RUN-ACC)
3 E2 20OR FUSED PANEL LAMPS DIMMER SWITCH SIGNAL
4- -
5- -
6- -
7 X54 18VT RIGHT FRONT DOOR SPEAKER (+)
8 X56 18DB/RD RIGHT FRONT DOOR SPEAKER (-)
9 X55 18BR/RD LEFT FRONT DOOR SPEAKER (-)
10 X53 18DG LEFT FRONT DOOR SPEAKER (+)
11 Z9 16BK GROUND
12 M1 20PK FUSED B(+)
13 X16 18LG (PREMIUM) ANTENNA RELAY OUTPUT
14 D25 18YL/VT PCI BUS
15 - -
16 - -
17 - -
18 X51 18BR/YL LEFT REAR SPEAKER (+)
19 X57 18BR/LB LEFT REAR SPEAKER (-)
20 X58 18DB/OR RIGHT REAR SPEAKER (-)
21 X52 18DB/WT RIGHT REAR SPEAKER (+)
22 Z9 16BK GROUND
8Wa - 80 - 84 8W-80 CONNECTOR PIN-OUTSKJ

RADIO C2 - 10 WAY
CAV CIRCUIT FUNCTION
1 X40 20WT/RD AUDIO OUT RIGHT
2 Z30 20WT/BK GROUND
3 Z9 20BK/DB GROUND
4 D25 20YL/VT PCI BUS
5 X112 20RD IGNITION SWITCH OUTPUT
6 X41 20WT/DG AUDIO OUT LEFT
7 Z17 20BK GROUND
8- -
9- -
10 X160 20YL B(+)
RADIO C3-2WAY
CAV CIRCUIT FUNCTION
1 X30 BK RADIO ANTENNA CORE
2 X31 BK RADIO ANTENNA SHIELD
RADIO CHOKE (PREMIUM) - GRAY 4 WAY
CAV CIRCUIT FUNCTION
1 F60 16DG/RD FUSED B(+)
2 X13 16BK/RD RADIO CHOKE OUTPUT
3 X16 18LG ANTENNA RELAY OUTPUT
4 Z140 16BK/LG GROUND
REAR POWER OUTLET - RED 3 WAY
CAV CIRCUIT FUNCTION
1 F41 16PK/VT FUSED B(+)
2- -
3 Z151 16BK/WT GROUND
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-85

RIGHT SIDE IMPACT AIRBAG CONTROL MODULE (RSIACM) - YELLOW 8 WAY
CAV CIRCUIT FUNCTION
1 F14 18LG/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
2- -
3 R76 18YL/DB RIGHT CURTAIN SQUIB LINE 2
4 R74 18YL/BR RIGHT CURTAIN SQUIB LINE 1
5 Z100 18BK/YL GROUND
6- -
7- -
8 D25 18YL/VT PCI BUS
RIGHT SIDE MARKER LAMP (EXCEPT BUILT-UP-EXPORT) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 L78 18DG/YL FUSED PARK LAMP RELAY OUTPUT
2 L62 18BR/RD RIGHT TURN SIGNAL
RIGHT SIDE REPEATER LAMP (BUILT-UP-EXPORT) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 L62 18BR/RD RIGHT TURN SIGNAL
2 Z142 18BK/WT GROUND
RIGHT SPEED CONTROL SWITCH (EXCEPT BASE) - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1- -
2 K4 20BK/LB SENSOR GROUND
3 V37 20RD/LG SPEED CONTROL SWITCH SIGNAL
4- -
RIGHT TAIL/STOP LAMP - BLACK 6 WAY
CAV CIRCUIT FUNCTION
1 L38 18BR/WT (BUILT-UP-EXPORT) REAR FOG LAMP RELAY OUTPUT
2 L78 18DG/YL FUSED PARK LAMP RELAY OUTPUT
3 L50 18WT/TN BRAKE LAMP SWITCH OUTPUT
4 L10 18BR/LG BACK-UP LAMP FEED
5 Z151 18BK/WT GROUND
6 L62 18BR/RD RIGHT TURN SIGNAL
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-93

RIGHT VISOR/VANITY LAMP (EXCEPT BASE) - WHITE 2 WAY
CAV CIRCUIT FUNCTION
1 M1 20PK FUSED B(+)
2 M20 20BR COURTESY LAMP LOAD SHED
SENTRY KEY IMMOBILIZER MODULE (EXCEPT BASE) - BLACK 6 WAY
CAV CIRCUIT FUNCTION
1 F33 20PK/RD FUSED B(+)
2 Z11 20BK/WT GROUND
3 F1 20DB FUSED IGNITION SWITCH OUTPUT (RUN-START)
4 Z110 20BK/TN GROUND
5 D25 20YL/VT/BK PCI BUS
6- -
SHIFTER ASSEMBLY - WHITE 6 WAY
CAV CIRCUIT FUNCTION
1 E2 20OR FUSED PANEL LAMPS DIMMER SWITCH SIGNAL
2 Z21 20BK/LG GROUND
3 T6 20VT/WT OVERDRIVE OFF SWITCH SENSE
4 Z21 20BK/LG GROUND
5 F22 18DB/PK FUSED IGNITION SWITCH OUTPUT (RUN)
6 K29 20WT/PK BRAKE SWITCH SENSE
SIREN (BUILT-UP-EXPORT)-3WAY
CAV CIRCUIT FUNCTION
1 Z142 18BK/WT GROUND
2 X75 18DG SIREN SIGNAL CONTROL
3 M1 18PK FUSED B(+)
SPEED CONTROL SERVO - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 V36 18TN/RD SPEED CONTROL VACUUM SOLENOID CONTROL
2 V35 18LG/RD SPEED CONTROL VENT SOLENOID CONTROL
3 V30 18DB/RD SPEED CONTROL BRAKE SWITCH OUTPUT
4 Z212 18BK/OR GROUND
8Wa - 80 - 94 8W-80 CONNECTOR PIN-OUTSKJ

TRANSMISSION CONTROL MODULE (3.7L) - BLACK 60 WAY
CAV CIRCUIT FUNCTION
1 T1 18LG/BK TRS T1 SENSE
2 T4 18PK/OR TRS T2 SENSE
3 T3 18VT TRS T3 SENSE
4- -
5- -
6 K24 18GY/BK CRANKSHAFT POSITION SENSOR SIGNAL
7 D21 18PK SCI TRANSMIT
8 F45 18YL/BR FUSED IGNITION SWITCH OUTPUT (START)
9 T9 18OR/BK OVERDRIVE PRESSURE SWITCH SENSE
10 T10 18YL/DG TORQUE MANAGEMENT REQUEST SENSE
11 F1 18DB FUSED IGNITION SWITCH OUTPUT (RUN-START)
12 K22 18OR/DB THROTTLE POSITION SENSOR SIGNAL
13 T13 18DB/BK SPEED SENSOR GROUND
14 T14 18LG/WT OUTPUT SPEED SENSOR SIGNAL
15 K30 18PK TRANSMISSION CONTROL RELAY CONTROL
16 T16 14RD TRANSMISSION CONTROL RELAY OUTPUT
17 T16 14RD TRANSMISSION CONTROL RELAY OUTPUT
18 T591 18YL/DB PRESSURE CONTROL SOLENOID CONTROL
19 T119 18WT/DB 2C SOLENOID CONTROL
20 T20 18LB LOW/REVERSE SOLENOID CONTROL
21 - -
22 - -
23 - -
24 - -
25 - -
26 - -
27 - -
28 - -
29 T29 18GY UNDERDRIVE PRESSURE SWITCH SENSE
30 T38 18VT/TN LINE PRESSURE SENSOR SIGNAL
31 - -
32 - -
33 - -
34 - -
35 - -
36 T16 14RD TRANSMISSION CONTROL RELAY OUTPUT
37 Z113 14BK/YL GROUND
38 T39 18GY/LB 5 VOLT SUPPLY
39 Z113 14BK/YL GROUND
40 T140 18VT/LG MS SOLENOID CONTROL
41 T411 18WT/PK TRS T41 SENSE
42 T42 18VT/WT TRS T42 SENSE
43 D25 18VT/YL PCI BUS
44 - -
45 - -
46 D20 18LG SCI RECEIVE
47 T147 18LB 2C PRESSURE SWITCH SENSE
48 T48 18DB 4C PRESSURE SWITCH SENSE
49 T6 18OR/WT OVERDRIVE OFF SWITCH SENSE
50 T50 18DG LOW/REVERSE PRESSURE SWITCH SENSE
51 K4 18BK/LB SENSOR GROUND
52 T52 18RD/BK INPUT SPEED SENSOR SIGNAL
53 Z112 14BK GROUND
8Wa - 80 - 98 8W-80 CONNECTOR PIN-OUTSKJ

ENGINE - 3.7L
TABLE OF CONTENTS
page page
ENGINE - 3.7L
DESCRIPTION..........................3
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION............4
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - PERFORMANCE............4
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - MECHANICAL..............6
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - LUBRICATION..............7
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE..............8
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE.......8
STANDARD PROCEDURE
STANDARD PROCEDURE - ENGINE
GASKET SURFACE PREPARATION.........9
STANDARD PROCEDURE - REPAIR
DAMAGED OR WORN THREADS..........9
STANDARD PROCEDURE - ENGINE CORE
AND OIL GALLERY PLUGS..............10
REMOVAL.............................10
INSTALLATION.........................11
SPECIFICATIONS
TORQUE............................12
3.7L ENGINE.........................12
SPECIAL TOOLS
3.7L ENGINE.........................15
AIR CLEANER ELEMENT
REMOVAL - 3.7L........................19
INSTALLATION - 3.7L....................19
CYLINDER HEAD - LEFT
DESCRIPTION - VALVE GUIDES...........19
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - HYDRAULIC
LASH ADJUSTER.....................19
DIAGNOSIS AND TESTING - CYLINDER
HEAD GASKET.......................19
REMOVAL.............................20
CLEANING............................22
INSTALLATION.........................22
CAMSHAFT(S)
DESCRIPTION.........................23
REMOVAL.............................24
INSTALLATION.........................25
CYLINDER HEAD COVER(S)
DESCRIPTION.........................25
REMOVAL.............................25INSTALLATION.........................26
INTAKE/EXHAUST VALVES & SEATS
DESCRIPTION.........................26
STANDARD PROCEDURE - REFACING......26
REMOVAL.............................27
INSTALLATION.........................28
ROCKER ARM
DESCRIPTION.........................29
VALVE GUIDE SEALS
DESCRIPTION.........................29
VALVE SPRINGS
DESCRIPTION.........................29
REMOVAL.............................29
INSTALLATION.........................29
CYLINDER HEAD - RIGHT
DESCRIPTION
DESCRIPTION - CYLINDER HEAD........30
DESCRIPTION - VALVE GUIDES..........30
DESCRIPTION........................30
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - HYDRAULIC
LASH ADJUSTER.....................30
DIAGNOSIS AND TESTING - CYLINDER
HEAD GASKET.......................30
REMOVAL.............................31
CLEANING............................31
INSPECTION..........................32
INSTALLATION.........................32
CAMSHAFT(S)
DESCRIPTION.........................33
REMOVAL.............................33
INSTALLATION.........................33
CYLINDER HEAD COVER(S)
REMOVAL.............................34
INSTALLATION.........................34
INTAKE/EXHAUST VALVES & SEATS
STANDARD PROCEDURE - REFACING......34
REMOVAL.............................35
INSTALLATION.........................36
ROCKER ARM
DESCRIPTION.........................37
REMOVAL.............................37
INSTALLATION.........................37
VALVE GUIDE SEALS
DESCRIPTION.........................38
VALVE SPRINGS
DESCRIPTION.........................38
REMOVAL.............................38
INSTALLATION.........................38
KJENGINE - 3.7L 9 - 1

DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either per-
formance (e.g., engine idles rough and stalls) or
mechanical (e.g., a strange noise).
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING)ÐPERFORMANCE and (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)ÐMECHANICAL for
possible causes and corrections of malfunctions.
(Refer to 14 - FUEL SYSTEM/FUEL DELIVERY -
DIAGNOSIS AND TESTING) and (Refer to 14 -
FUEL SYSTEM/FUEL INJECTION - DIAGNOSIS
AND TESTING) for the fuel system diagnosis.Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following diagnosis:
²Cylinder Compression Pressure Test (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
²Cylinder Combustion Pressure Leakage Test
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING).
²Engine Cylinder Head Gasket Failure Diagnosis
(Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNO-
SIS AND TESTING).
²Intake Manifold Leakage Diagnosis (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
DIAGNOSIS AND TESTING).
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery 1. Charge or replace as necessary.
2. Corroded or loose battery
connections.2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to the terminals.
3. Faulty starter. 3. (Refer to 8 - ELECTRICAL/
STARTING - DIAGNOSIS AND
TESTING).
4. Faulty coil or control unit. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
5. Incorrect spark plug gap. 5. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
6. Incorrect right bank cam timing. 6. Refer to engine timing in this
section.
7. Dirt or water in fuel system. 7. Clean system and replace fuel
filter.
8.Faulty fuel pump, relay or wiring. 8.Repair or replace as necessary.
9. Faulty cam or crank sensor 9. Refer to Ignition system.
ENGINE STALLS OR ROUGH IDLE 1. Vacuum leak. 1. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
2. Faulty crank position sensor 2. Replace crank position sensor.
4. Faulty coil. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
9 - 4 ENGINE - 3.7LKJ
ENGINE - 3.7L (Continued)