
1 2
EGR SOLENOID CONTROL K35 20GY/YL
2
1A142 18DG/OR CAV FUNCTION CIRCUIT
AUTO SHUTDOWN RELAY OUTPUT
(DIESEL) EGR SOLENOID
EGR SOLENOID
21GRAY
F87 18WT/BK K35 18GY/YL
2 1 CAV FUSED IGNITION SWITCH OUTPUT EGR SOLENOID CONTROL CIRCUIT
FUNCTION
(2.4L MTX/3.3L/3.8L)
Z1 18BK
K126 20LG
Z1 18BK
K67 20BR/BK
K68 20LG/YL
K24 18GY/BK
K4 18BK/LB
Z12 18BK
K2 20TN/BK
C13 20DB/OR
C24 20DB/PK
C24 20DB/PK
BLACK
CIRCUIT
CAV
1
2
3
4
6 5
B106
(DIESEL) E97
(DIESEL)
109 8 7
C13 20DB/OR K2 20TN/BK Z122 18BK 7
8
9
10
5
6K68 18LG/YL
4K67 18BR/BK Z122 18BK
321K126 18LG CAV CIRCUIT K24 20GY/BK
K4 20BK/LB BLACK1
65
10 5
101
6 6 1
10 5
LT. GRAY
K135 18WT/BK K134 18LB/BKCIRCUIT
CAV
A142 18DG/OR
1
2
3K35 20GY/YL
K51 20DB/YL
4G7 18WT/OR
6 5
109 8
7A142 18DG/OR
K140 18TN/WT
K156 18GY
-- K156 20GY
K140 18TN/WT
A142 18DG/OR
7
8
9
10(DIESEL)E96
(DIESEL)B108
5
6G7 18WT/OR
4K51 20DB/YL K35 20GY/YL
321A142 18DG/OR CAV CIRCUIT K134 20LB/BK
K135 20WT/BK LT. GRAY5
10 1
6
8W - 80 - 28 8W-80 CONNECTOR PIN-OUTSNS/GS
J988W-3NSGS8028

MIRROR - C2 PASSENGER POWER
6 5BLUE4
213
P68 20DG/RD P66 20WT/BK P67 20YL/RD
3 2
1 CAV PASSENGER MIRROR POSITION (HORIZONTAL)
PASSENGER MIRROR POSITION COMMON PASSENGER MIRROR POSITION (VERTICAL) CIRCUIT
FUNCTION
MIRROR - C1 PASSENGER POWER
RED564
1 2 3Z1 20BK C16 20LB/YL P70 20WT P72 20YL/BK
P74 20DB
6 5 4
3
2 1 CAV GROUND FUSED B(+) MIRROR SWITCH COMMON
MIRROR SWITCH OUTPUT (VERTICAL) MIRROR SWITCH OUTPUT (HORIZONTAL)
- CIRCUIT
- FUNCTION
4
--
5
P159 20DG* PASSENGER MIRROR UNFOLD SIGNAL
6
P160 20LB* PASSENGER MIRROR FOLD SIGNAL
* BUILT-UP-EXPORT FUSED IGNITION (RUN)-
DSEAT SWITCH PASSENGER HEATEDC B A
F20 20WT- F20 20WT P86 20VT CAV
FUSED IGNITION (RUN) HEATED SEAT TEMPERATURE SENSOR CIRCUIT FUNCTION
Z1 18BK EGROUND
F
P8 20WT/BKPASSENGER HEATED SEAT SWITCH
** RKE
NS/GS8W-80 CONNECTOR PIN-OUTS 8W - 80 - 63
NSGS8063J988W-3

POWER SEAT
CIRCUIT BREAKER
2 1GRAY
2F35 14RD* F35 14RD A3 12PK/BK 1 CAV FUSED B(+) FUSED B(+) FUNCTION CIRCUIT
* MEMORY SEAT
(DIESEL) MODULE CONTROL POWERTRAIN
46 68
23
1
CONTINUED ON NEXT PAGE V37 20RD/LG SPEED CONTROL SWITCH SIGNAL- - - - - - - - SLEEVE POSITION SENSOR K134 20LB/BKA/C COMPRESSOR CLUTCH RELAY CONTROL C13 20DB/ORSPEED CONTROL LAMP DRIVER V38 20LB/RDGROUND Z12 16BK/TNDIESEL POWER RELAY OUTPUT A142 16DG/OR- ENGINE SPEED SENSOR RETURN K3 20BK/VT5 VOLT SUPPLY K7 20OR- - ACCELERATOR PEDAL SENSOR SIGNAL ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
K22 20OR/DB K2 20TN/BKNEEDLE MOVEMENT SENSOR SIGNAL K67 20BR/BKFUEL QUANTITY ACTUATOR SIGNAL
- -
- - FUEL QUANTITY ACTUATOR SIGNAL K140 18TN/WTGROUND Z12 16BK/TN
ENGINE SPEED SENSOR SIGNAL K159 20VT/RD
FUNCTION
-
-
-
- CIRCUIT
-
-
- ENGINE STARTER MOTOR RELAY CONTROL
LOW SPEED RADIATOR FAN RELAY NO. 2 CONTROL
CONTROL SLEEVE POSITION SENSOR
ENGINE SPEED SENSOR FEED
NEEDLE MOVEMENT SENSOR RETURN
A/C PRESSURE SWITCH SIGNAL
CLUTCH SWITCH SIGNAL
GLOW PLUG LAMP DRIVER
SENSOR GROUND
A/C SWITCH SIGNAL
BOOST PRESSURE SENSOR SIGNALCAV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40 K90 20TN
K140 18TN/WT
C24 20DB/PK
K57 20LG/OR
K24 18GY/BK
K68 20LG/YL
C18 20DB
K119 20LG/BK
K29 20WT/PK
G85 20OR/BK
K4 20BK/LB
C103 20DG/LB
K1 20DG/RD
EGR SOLENOID CONTROL K35 20GY/YL
FUSED IGNITION (ST-RUN) F87 18WT/BK
(2.0L/2.4L) PRESSURE SWITCHPOWER STEERING
21
BLACK
Z1 18BK K10 18DB/OR
2 1 CAV GROUND POWER STEERING PRESSURE SWITCH SENSE FUNCTION CIRCUIT
BRAKE SWITCH SENSE
NS/GS8W-80 CONNECTOR PIN-OUTS 8W - 80 - 69
NSGS8069J988W-3

MODULE - C1CONTROL POWERTRAIN
- -
K90 18TN ENGINE STARTER MOTOR RELAY CONTROL
C103 18DG/LB A/C SWITCH SIGNALKNOCK SENSOR SIGNAL K42 18DB/LG- - BLACK
10 20 30 40
1 11 21 31
K35 18GY/YL K1 18DG/RD K22 18OR/DB K44 18TN/YL K24 18GY/BK K41 18BK/DG K2 18TN/BK G3 18BK/PK F87 18WT/BK K12 18TN/WT K14 18LB/BR
K38 18GY K58 18BR/DB K11 18WT/DB K19 18GY/RD Z12 18BK/TN K20 18DG K13 18YL/WT
A142 18DG/OR V32 18YL/RD K17 18DB/TN K18 18RD/YL
40 39 38
37 36 35
34 33 32
31
30 29 28
27 26 25 24 23
22 21 20
19 18 17
16 15 14
13 12 11
10 9 8
7 6 5
4 3 2
1 CAV EGR SOLENOID CONTROL MANIFOLD ABSOLUTE PRESSURE SENSOR SIGNAL THROTTLE POSITION SENSOR SIGNAL CAMSHAFT POSITION SENSOR SIGNAL CRANKSHAFT POSITION SENSOR SIGNAL HEATED OXYGEN SENSOR SIGNAL ENGINE COOLANT TEMPERATURE SENSOR SIGNAL SERVICE ENGINE SOON INDICATOR LAMP DRIVER FUSED IGNITION SWITCH OUTPUT (ST-RUN) INJECTOR NO. 2 DRIVER INJECTOR NO. 4 DRIVER
INJECTOR NO. 5 DRIVER (3.3L/3.8L) INJECTOR NO. 6 DRIVER (3.3L/3.8L) INJECTOR NO. 1 DRIVER IGNITION COIL NO. 1 DRIVER GROUND GENERATOR FIELD DRIVER INJECTOR NO. 3 DRIVER
AUTOMATIC SHUT DOWN RELAY OUTPUT SPEED CONTROL ON/OFF SWITCH SENSE IGNITION COIL NO. 2 DRIVER IGNITION COIL NO. 3 DRIVER (3.3L/3.8L)
- - - - - - -
- - - - - CIRCUIT
- - - - - - -
- - - - - FUNCTION
K21 18BK/RD* INTAKE AIR TEMPERATURE SENSOR SIGNAL
* 2.0L
NS/GS8W-80 CONNECTOR PIN-OUTS 8W - 80 - 71
NSGS8071J988W-3

Component/
GroundColor Location Fig.
Camshaft
Position Sensor
3.3L, 3.8LBK RT Side of
Engine9
Center Dome
LampBK At Lamp N/S
CHMSL RD Rear of CHMSL 21
Cigar Lighter BK Rear of Lighter 9
Clockspring C1 YL Rear of
Clockspring11
Clockspring C2 NAT Rear of
Clockspring11
Clutch Interlock
SwitchBK Top of Clutch
Pedal13
Controller
Anti-Lock BrakeBK RT Side of
Engine
CompartmentN/S
Crankcase Vent
HeaterAt Heater N/S
Crankshaft
Position SensorBK Rear of Engine 5, 6, 7,
9
D01 BK On Kick Panel 18
D02 BK On Kick Panel 18
Data Link
ConnectorBK LT of Steering
Column12
Downstream
Heated Oxygen
SensorBK Front Center of
Floor Pan16
Driver Airbag YL Rear of Airbag 11
E36 BK LT Frame Rail 2
E40 BK At Radiator Fan
ModuleN/S
E43 LT/GY LT Frame Rail 2
E69 BK LT Side of
Intake6, 7
E78 BK Near Throttle
Body9
EC1 Above RT
Vanity Mirror17
EGR Solenoid BK LT Rear of
Engine6, 9
Electric Wiper
De-Icer C1BK At Left Base of
Windshield11
Electric Wiper
De-Icer C2BK At Right Base
of Windshield11Component/
GroundColor Location Fig.
Engine Coolant
Temp Sensor
2.4LBK On Cylinder
BlockN/S
Engine Coolant
Temp Sensor
2.5BK On Cylinder
Head8
Engine Coolant
Temp Sensor
3.3L, 3.8LBK On Cylinder
BlockN/S
Engine Oil
Pressure SwitchGN On Cylinder
Block5, 6, 7,
8, 9
Engine Starter
MotorRear of Starter 5, 6, 7,
8, 9
EVAP/Purge
SolenoidBK RT Motor
Mount3
Evaporator
Temperature
SensorBK RT Side of
HVACN/S
F02 BK Near Throttle
Body9
F09 BK LT Side of
Intake6, 7
Front Blower
MotorBK At Motor 10
Front Blower
Motor Resistor
BlockBK RT Side Cowl 4
Front Cigar
LighterBK Rear of Lighter 9
Front Reading
Lamps/SwitchRD At Lamp 15
Front Washer
MotorBK Bottom of
Reservior4
Fuel Injection
PumpBK Near Pump 8
Fuel Injector #1 BK At Injector N/S
Fuel Injector #2 BK At Injector N/S
Fuel Injector #3 BK At Injector N/S
Fuel Injector #4 BK At Injector N/S
Fuel Injector #5 BK At injector N/S
Fuel Injector #6 BK At Injector N/S
Fuel Injectors
(2.0L)BK At Injectors 5
Fuel Pump
HeaterBK At Heater N/S
Fuel Pump
ModuleLT/GY Side of Fuel
Tank20
8W - 90 - 2 8W - 90 CONNECTOR/GROUND LOCATIONSNS/GS
DESCRIPTION AND OPERATION (Continued)

Component/
GroundColor Location Fig.
Downstream
Heated Oxygen
SensorBK Front Center of
Floor Pan16
Driver Airbag YL Rear of Airbag 11
E36 BK LT Frame Rail 2
E40 BK At Radiator Fan
ModuleN/S
E43 LT/GY LT Frame Rail 2
E69 BK LT Side of
Intake6, 7
E78 BK Near Throttle
Body9
EC1 At Top Center
of Windshield17
EGR Solenoid BK LT Rear of
Engine6, 9
Electric Wiper
De-Icer C1BK At Right Base
of Windshield11
Electric Wiper
De-Icer C2BK At Left Base of
Windshield11
Engine Coolant
Temp Sensor
2.4LBK On Cylinder
BlockN/S
Engine Coolant
Temp Sensor
3.3L, 3.8LBK On Cylinder
BlockN/S
Engine Oil
Pressure SwitchGN On Cylinder
Block5, 6, 7,
8, 9
Engine Starter
MotorRear of Starter 5, 6, 7,
8, 9
EVAP/Purge
SolenoidBK RT Motor
Mount3
Evaporator
Temperature
SensorBK RT Side of
HVACN/S
F02 BK Near Throttle
Body9
F09 BK LT Side of
Intake6, 7
Front Blower
MotorBK At Motor 10
Front Blower
Motor Resistor
BlockBK LT Side of
Engine2
Front Cigar
LighterBK Rear of Lighter 11Component/
GroundColor Location Fig.
Front Reading
Lamps/SwitchBL At Lamp 17
Front Washer
MotorBK Bottom of
Reservior4
Fuel Injector #1 BK At Injector N/S
Fuel Injector #2 BK At Injector N/S
Fuel Injector #3 BK At Injector N/S
Fuel Injector #4 BK At Injector N/S
Fuel Injector #5 BK At Injector N/S
Fuel Injector #6 BK At Injector N/S
Fuel Pump
ModuleGY Side of Fuel
Tank20
G100 LT Frame Rail 3
G101 2.4L Rear of
Cylinder Head6, 7
G101 3.3L, 3.8L Rear of
Cylinder Block9
G102 LT Frame Rail 3
G103 2.4L Rear of
Cylinder Head6, 7
G103 3.3L, 3.8L Rear of
Cylinder Block9
G104 Near T/O for
RT HeadlampN/S
G200 Left of I.P.
Center Stack10
G201 I.P. Center
Support10
G202 I.P. Center
Support10
G204 I.P. Center
Support10
G300 BK LT Kick Panel 13
G301 RT Kick Panel 13, 14
G302 BK LT Quarter
Panel21
G400 BK In Liftgate 23
Generator BK Rear of
Generator5, 6, 7,
8, 9
Glove Box
LampBL Rear of Glove
Box11
Headlamp
Dimmer SwitchBK Part of
Multifunction
Switch11
8W - 90 - 32 8W - 90 CONNECTOR/GROUND LOCATIONSNS/GS
DESCRIPTION AND OPERATION (Continued)

(5) Test resistance of spark plug cables. Refer to
Group 8D, Ignition System.
(6) Test ignition coils primary and secondary resis-
tance. Replace parts as necessary. Refer to Group 8D,
Ignition System.
(7) Check fuel pump pressure at idle and different
RPM ranges. Refer to Group 14, Fuel System for
Specifications.
(8) The air filter elements should be replaced as
specified in Group 0, Lubrication and Maintenance.
(9) Inspect crankcase ventilation system as out-
lined in Group 25, Emission Control Systems.
(10) Road test vehicle as a final test.
HONING CYLINDER BORES
(1) Used carefully, the cylinder bore resizing hone
C-823 equipped with 220 grit stones, is the best tool
for this job. In addition to deglazing, it will reduce
taper and out-of-round as well as removing light
scuffing, scoring or scratches. Usually a few strokes
will clean up a bore and maintain the required lim-
its.
(2) Deglazing of the cylinder walls may be done
using a cylinder surfacing hone, Tool C-3501,
equipped with 280 grit stones, if the cylinder bore is
straight and round. 20-60 strokes depending on the
bore condition, will be sufficient to provide a satisfac-
tory surface. Inspect cylinder walls after each 20
strokes, using a light honing oil.Do not use engine
or transmission oil, mineral spirits or kerosene.
(3) Honing should be done by moving the hone up
and down fast enough to get a cross-hatch pattern.
When hone marksintersectat 50-60 degrees, the
cross hatch angle is most satisfactory for proper seat-
ing of rings (Fig. 2).(4) A controlled hone motor speed between
200-300 RPM is necessary to obtain the proper cross-
hatch angle. The number of up and down strokes per
minute can be regulated to get the desired 50-60
degree angle. Faster up and down strokes increase
the cross-hatch angle.
(5) After honing, it is necessary that the block be
cleaned again to remove all traces of abrasive.
CAUTION: Ensure all abrasives are removed from
engine parts after honing. It is recommended that a
solution of soap and hot water be used with a
brush and the parts then thoroughly dried. The bore
can be considered clean when it can be wiped
clean with a white cloth and cloth remains clean.
Oil the bores after cleaning to prevent rusting.
MEASURING MAIN BEARING AND CONNECTING
ROD BEARING CLEARANCES
PLASTIGAGE METHOD
Engine crankshaft bearing clearances can be deter-
mined by use of Plastigage or equivalent. The follow-
ing is the recommended procedure for the use of
Plastigage:
NOTE: The total clearance of the main bearings
can only be determined by removing the weight of
the crankshaft. This can be accomplished by either
of two methods:
PREFERRED METHOD
Shimming the bearings adjacent to the bearing to
be checked in order to remove the clearance between
upper bearing shell and the crankshaft. This can be
accomplished by placing a minimum of 0.254 mm
(0.010 in.) shim (e. g. cardboard, matchbook cover,
etc.) between the bearing shell and the bearing cap
on the adjacent bearings and tightening bolts to
14-20 N´m (10-15 ft. lbs.). The number of main bear-
ing will vary from engine to engine.
Fig. 2 Cylinder Bore Cross-Hatch Pattern
Fig. 3 Plastigage Placed in Lower Shell
NSENGINE 9 - 3
GENERAL INFORMATION (Continued)

cause of low compression unless some malfunc-
tion is present.
(11) Clean or replace spark plugs as necessary
and adjust gap as specified in Group 8, Electrical.
Tighten to specifications.
(12) Test resistance of spark plug cables. Refer to
Group 8, Electrical Ignition System Secondary Cir-
cuit Inspection.
(13) Test coil output voltage, primary and second-
ary resistance. Replace parts as necessary. Refer to
Group 8, Electrical Ignition System.
(14) Check fuel pump pressure at idle and differ-
ent RPM ranges. Refer to Group 14, Fuel System for
Specifications.
(15) The air filter elements should be replaced as
specified in Group 0, Lubrication and Maintenance,.
(16) Inspect crankcase ventilation system as out
lined in Group 0, Lubrication and Maintenance. For
emission controls see Group 25, Emission Controls
for service procedures.
(17) Inspect and adjust accessory belt drives refer-
ring to Group 7, Cooling System, Accessory Drive
Belts for proper adjustments.
(18) Road test vehicle as a final test.
CYLINDER COMBUSTION PRESSURE LEAKAGE
TEST
The combustion pressure leakage test provides an
accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
²Exhaust and intake valve leaks (improper seat-
ing).
²Leaks between adjacent cylinders or into water
jacket.
²Any causes for combustion/compression pressure
loss.
WARNING: DO NOT REMOVE THE RADIATOR CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
Check the coolant level and fill as required. DO
NOT install the radiator cap.
Start and operate the engine until it attains nor-
mal operating temperature, then turn the engine
OFF.
Clean spark plug recesses with compressed air.
Remove the spark plugs.
Remove the oil filler cap.
Remove the air cleaner.
Calibrate the tester according to the manufactur-
er's instructions. The shop air source for testing
should maintain 483 kPa (70 psi) minimum, 1 379
kPa (200 psi) maximum and 552 kPa (80 psi) recom-
mended.Perform the test procedures on each cylinder
according to the tester manufacturer's instructions.
While testing, listen for pressurized air escaping
through the throttle body, tailpipe and oil filler cap
opening. Check for bubbles in the radiator coolant.
All gauge pressure indications should be equal,
with no more than 25% leakage.
FOR EXAMPLE:At 552 kPa (80 psi) input pres-
sure, a minimum of 414 kPa (60 psi) should be main-
tained in the cylinder.
LASH ADJUSTER (TAPPET) NOISE DIAGNOSIS
A tappet-like noise may be produced from several
items. Check the following items.
(1) Engine oil level too high or too low. This may
cause aerated oil to enter the adjusters and cause
them to be spongy.
(2) Insufficient running time after rebuilding cylin-
der head. Low speed running up to 1 hour may be
required.
(3) During this time, turn engine off and let set for
a few minutes before restarting. Repeat this several
times after engine has reached normal operating
temperature.
(4) Low oil pressure.
(5) The oil restrictor pressed into the vertical oil
passage to the cylinder head is plugged with debris.
(6) Air ingested into oil due to broken or cracked
oil pump pick up.
(7) Worn valve guides.
(8) Rocker arm ears contacting valve spring
retainer.
(9) Rocker arm loose, adjuster stuck or at maxi-
mum extension and still leaves lash in the system.
(10) Faulty lash adjuster.
a. Check lash adjusters for sponginess while
installed in cylinder head. Depress part of rocker
arm over adjuster. Normal adjusters should feel very
firm. Spongy adjusters can be bottomed out easily.
b. Remove suspected lash adjusters, and disassem-
bleDo not reuse retainer caps. Do not inter-
change parts and make sure that care and
cleanliness is exercised in the handling of parts.
c. Clean out dirt and varnish with solvent.
d. Reassemble with engine oil.
e. Check for sponginess.
f. If still spongy, replace with new adjuster.
INSPECTION (ENGINE OIL LEAKS IN GENERAL)
Begin with a through visual inspection of the
engine, particularly at the area of the suspected leak.
If an oil leak source is not readily identifiable, the
following steps should be followed:
(1) Do not clean or degrease the engine at this
time because some solvents may cause rubber to
swell, temporarily stopping the leak.
9 - 8 ENGINENS
DIAGNOSIS AND TESTING (Continued)