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23-14
ENGINE CONTROLS: 4.2L
Cooling
fan
speed
signal
Generator
field
duty
cycle signal
AC
refrigerant
pressure
sensor
signal
POWERTRAIN
CONTROL
MODULE
(PCM)
Connector
Generator
turn-on
signal
GRY
0.35
BLK
0.35
RED/BLK
0.35
GRY
0.35
GRY
0.35
WHT/BLK
0.35
RED
0.35
GRY
0.35
Charging System
Engine Cooling Fans
43
60
2
51
C2
54
14
41
60
C3
57
C1
C1
Air Conditioning: Manual
Air Conditioning: Automatic
DK BLU
0.35
C3
Cooling
fan clutch
control
Low
reference
5 volt
reference
Low
reference
5 volt
reference
DK GRN/WHT
0.35
42
A/C
compressor
clutch
relay
control
DK GRN
0.35
29
Crank
request
signal
PNK/WHT
0.35
4
C3
Damping
lift/dive
signal
Starting
System
(Not used)
C100
A
Air Conditioning: Manual
Air Conditioning: Automatic
Circuit Schematic
23-15
ENGINE CONTROLS: 4.2L
(Refer to Section 201 for photographs.)
Component
Photo No.
A/C Refrigerant Pressure
Sensor (4.2L)
Bottom right side of engine
32
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accelerator Pedal Position
(APP) Sensor (4.2L)
On the accelerator bracket
63
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camshaft Actuator Solenoid
Assembly (4.2L)
Right front of engine
14
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camshaft Position (CMP)
Sensor (4.2L)
Right front of engine
14
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Fan
Top left side of radiator fan shroud
2
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crankshaft Position (CKP
Sensor (4.2L)
Left side of engine
27
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Brake Control
Module (EBCM)
Inner left side frame rail (near transmission)
41
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Coolant Temperature
(ECT) Sensor (4.2L)
Left front of engine
5
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil Pressure (EOP)
Switch (4.2L)
Bottom right side of engine
33
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporative Emission (EVAP)
Canister Purge Solenoid
(4.2L)
Left side of engine
27
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporative Emission (EVAP)
Canister Vent Solenoid
Rear of the fuel tank
115
. . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 1 (4.2L)
Left side of engine
26
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 2 (4.2L)
Left side of engine
26
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 3 (4.2L)
Left side of engine
26
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 4 (4.2L)
Left side of engine
26
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 5 (4.2L)
Left side of engine
26
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injector 6 (4.2L)
Left side of engine
26
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump and Sender
Assembly
Inside the fuel tank
. . . . . . . . . . . . . . . .
Fuel Tank Pressure (FTP)
Sensor
At top left rear of fuel tank
115
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block-Rear
Under the left rear seat
52
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block-Underhood
Left side of engine compartment
3
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated Oxygen Sensor
(HO2S) 1 (4.2L)
Right front of engine
13
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated Oxygen Sensor
(HO2S) 2 (4.2L)
Right side of transmission
45
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel Cluster
(IPC)
On the left side of the IP, above the steering column
59
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
Intake Air Temperature (IAT)
Sensor (4.2L)
Right rear of engine compartment
15
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Knock Sensor (KS) 1 (Front)
(4.2L)
Left side of engine
27
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Knock Sensor (KS) 2 (Front)
(4.2L)
Left side of engine
27
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manifold Absolute Pressure
(MAP) Sensor (4.2L)
Top rear of engine
6
. . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location Index
23-16
ENGINE CONTROLS: 4.2L
(Refer to Section 201 for photographs.)
Component
Photo No.
Powertrain Control Module
(PCM) (4.2L)
Left front of engine
5
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stop Lamp Switch
On brake pedal support
64
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Actuator Control
(TAC) Sensor (4.2L)
Top rear of engine
6
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Body (4.2L)
Top rear of engine
6
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle Speed Sensor (VSS)
(2WD)
Right rear of transmission
42
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle Speed Sensor (VSS)
(4WD)
Left rear of transfer case
44
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector
C100 (4.2L) (10-BLK)
Left front of engine
5
. . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C101 (38-BLK)
Left side of engine compartment
3
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C104 (4.2L) (8-BLK)
Top of engine
16
. . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C105 (10-BLK)
Left side of engine compartment
4
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C310 (2-BLK)
Right side of transmission
45
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
G107 (4.2L)
Lower left side of engine
37
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G108 (4.2L)
Lower left side of engine
37
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G305
Outside of left frame rail, near fuel tank
36
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location Index
24
ENGINE CONTROLS: 5.3L
Accelerator Pedal Position (APP) Sensor (5.3L)
Camshaft Position (CMP) Sensor (5.3L)
Crankshaft Position (CKP) Sensor (5.3L)
Electronic Brake Control Module (EBCM)
Engine Coolant Temperature (ECT) Sensor (5.3L)
Evaporative Emission (EVAP) Canister Purge Solenoid
(5.3L)
Evaporative Emission (EVAP) Canister Vent Solenoid
Fuel Injector 1 (5.3L)
Fuel Injector 2 (5.3L)
Fuel Injector 3 (5.3L)
Fuel Injector 4 (5.3L)
Fuel Injector 5 (5.3L)
Fuel Injector 6 (5.3L)
Fuel Injector 7 (5.3L)
Fuel Injector 8 (5.3L)
Fuel Pump and Sender Assembly
Fuel Tank Pressure (FTP) Sensor
Fuse Block-Rear
Fuse Block-Underhood
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 (5.3L)
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 (5.3L)
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 (5.3L)
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 (5.3L)
Instrument Panel Cluster (IPC)
Knock Sensor (KS) 1 (Left) (5.3L)
Knock Sensor (KS) 2 (Right) (5.3L)
Manifold Absolute Pressure (MAP) Sensor (5.3L)
Mass Air Flow (MAF) Sensor/Intake Air Temperature
(IAT) (5.3L)
Powertrain Control Module (PCM) (5.3L)
Stop Lamp Switch
Throttle Actuator Control (TAC) Module (5.3L)
Throttle Body (5.3L)
Vehicle Speed Sensor (VSS) (2WD)
Vehicle Speed Sensor (VSS) (4WD)
Component Index
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