Component Page
Fuel Tank Module...................8W-30, 45
Fuel Temperature Sensor.................8W-30
Fuel Timing Solenoid....................8W-30
Fuses (JB)............................8W-12
Fuses (PDC)...........................8W-10
Fusible Link.....................8W-20, 21, 63
Fusible Link A0........................8W-30
Fusible Link A11.......................8W-10
Fusible Link A54.......................8W-10
Grounds..............................8W-15
Generator.............................8W-20
Glove Box Lamp........................8W-44
Glow Plug Lamp.....................8W-30, 46
Glow Plugs............................8W-30
Glow Plug Relay........................8W-30
Headlamps............................8W-50
Headlamp Dimmer Switch..........8W-10, 46, 50
Headlamp Leveling Motors...............8W-50
Headlamp Switch.......................8W-50
Headlamp Washer......................8W-53
High Beam Indicator....................8W-46
High Beam Relay....................8W-10, 50
Headlamps............................8W-50
Horns................................8W-41
Hood Ajar Switch....................8W-39, 44
Horn Relay.........................8W-39, 41
Horn Switch.....................8W-10, 39, 41
HVAC Control.........................8W-42
Idle Air Control Motor...................8W-30
Ignition Coil Pack.......................8W-30
Ignition Switch.........................8W-10
Instrument Cluster.....................8W-40
Intake Air Temperature Sensor............8W-30
Intake Air Temperature/Manifold Absolute
Pressure Sensor.....................8W-30
Interior Lamps On Switch................8W-44
Junction Block.........................8W-12
Key-In Halo Lamp......................8W-44
Knock Sensor..........................8W-30
Lamp Assemblies.......................8W-51
License Lamp..........................8W-51
Liftgate Ajar Indicator Lamp..............8W-40
Liftgate Ajar Switch...............8W-39, 40, 44
Liftgate Arm/Disarm Switch............8W-39, 61
Liftgate Flood Lamps....................8W-44
Liftgate Lock Motor.....................8W-61
Low Beam Relay.....................8W-10, 50
Low Coolant Level Switch................8W-45
Low Fuel Warning Indicator Lamp..........8W-40
Low Oil Pressure Lamp..................8W-46
Low Washer Fluid Level Indicator Lamp.....8W-40
Low Washer Fluid Switch.................8W-53
Low/Reverse Pressure Switch..............8W-31
Low/Reverse Solenoid....................8W-31Component Page
Manifold Absolute Pressure Sensor.........8W-30
Memory Power Seat Switch...............8W-63
Seat Sensors...........................8W-63
Memory Seat/Mirror Module...........8W-62, 63
Memory Set Switch..................8W-62, 63
Message Center........................8W-46
Mid Reading Lamps.....................8W-44
Mode Door Actuator.....................8W-42
Name Brand Speaker Relay...............8W-47
Needle Movement Sensor.................8W-30
Odometer.............................8W-40
Output Shaft Speed Sensor...............8W-31
Overdrive Pressure Switch................8W-31
Overdrive Solenoid......................8W-31
Overhead Console.......................8W-49
Park Brake Switch...................8W-46, 50
Park Lamp Relay.........8W-10, 12, 44, 50, 51, 54
Park/Turn Signal Lamps.................8W-50
Airbag Squibs..........................8W-43
Power Distribution Center................8W-10
Power Folding Mirror Switch..............8W-62
Power Mirror Fold Relay.................8W-62
Power Mirror Switch....................8W-62
Power Mirror Unfold Relay...............8W-62
Power Seat Circuit Breaker............8W-62, 63
Powertrain Control Module...............8W-30
PTCs (JB).............................8W-12
Radiator Fan Disconnect.................8W-42
Radiator Fan Relays.....................8W-42
Radio................................8W-47
Radio Choke...........................8W-47
Reading Lamps........................8W-44
Rear A/C Heater Unit....................8W-42
Rear Blower Control Switches.............8W-42
Rear Cigar Lighter/Power Outlet...........8W-41
Rear Defogger On Indicator...............8W-42
Rear Dome Lamp.......................8W-44
Rear Fog Lamp.........................8W-51
Rear Fog Lamp Indicator.................8W-51
Rear Washer Motor.....................8W-53
Rear Washer Switch..................8W-42, 53
Rear Window Defogger...................8W-48
Rear Window Defogger Relay..............8W-48
Rear Window Defogger Switch..........8W-42, 48
Rear Wiper Delay On Indicator.........8W-42, 53
Rear Wiper Delay Switch..............8W-42, 53
Rear Wiper Motor.......................8W-53
Rear Wiper On Indicator..............8W-42, 53
Rear Wiper On Switch................8W-42, 53
Recirculate Mode Indicator................8W-42
Recirculate Mode Switch.................8W-42
Recirculation Door Actuator...............8W-42
Remote Keyless Entry Module.............8W-61
Repeater Lamps.....................8W-51, 52
8W - 02 - 2 8W - 02 COMPONENT INDEXNS/GS
FUSES
FUSE NO. AMPS FUSED CIRCUIT FEED CIRCUIT
110AF23 18DB/YL
F87 18WT/BK F14 18LG/YL
10A
2
3- SPARE
L33 20RD 10A
4
L34 20RD/OR 10A
5
620A
L44 20VT/RD
820A INTERNAL
INTERNAL 20A
9
1115A
A20 12RD/DB 1020A
INTERNAL
F32 18PK/DB 25A
12
SPARE 20A
13
A5 18RD/DB -
14
15*20A
A14 18RD/WT*
16
INTERNAL
F41 20PK/VT
A17 12RD/BK 20A
17
1815A
30A
19
40A
2140A
2240A
2340A
2440A
2540A
2640A
2740A
2810A 20AA22 12BK/OR
A0 6RD
INTERNAL
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD
A0 6RD L9 18BK/WT
A1 12RD
A16 12GY
A10 12RD/DG
A2 12PK/BK
A4 12BK/RD
M1 20PK L43 18VT
715A
A0 6RD A0 6RD A0 6RD A0 6RD A0 6RD INTERNAL L34 20RD/OR
20**INTERNAL
INTERNAL
INTERNAL
INTERNAL
INTERNAL
INTERNAL
* GAS
** DIESEL
F23 20DB/YL
F14 20LG/YL
BUILT-UP-EXPORT
EXCEPT BUILT-UP-EXPORT
NS/GS8W-10 POWER DISTRIBUTION 8W - 10 - 3
GS001003J988W-1
87
85 86
30
1
JUNCTION BLOCKTOP OF
23456789101112
6
FUSES
789105 4321PTC'S
87A 87A
3086 8587
87A
3086 8587
87
85 86
30
30 86
858787
85 86
30
12
10 112 98
4
5
13
76
1
21 2
1
2
21
DOOR UNLOCK
RELAY RELAYDOOR LOCK COMBINATION FLASHER/
DRL MODULE
RELAY DOOR UNLOCKDRIVER D3
D1D4
D2
COURTESY
LAMP RELAY REAR WINDOW
DEFOGGER RELAY
SPEAKER RELAYNAME BRAND
1
8
15
19
23
30234567
14 13 12 11 10 9
16
20 21 2218 17
29
36 35 34 33 32 31 24 25 26 27 28
28 27 26 25 24
31 32 33 34 35 3629 17 18
22 21 20 16 910111213147 6 5 4 3 2
30 2319 15 81
28 27 26 25 24
31 32 33 34 35 3629 17 18
22 21 20 16 910111213147 6 5 4 3 2
30 2319 15 81
28 27 26 25 24
31 32 33 34 35 3629 17 18
22 21 20 16 910111213147 6 5 4 3 2
30 2319 15 81
C1
C4
C3 C2
87
85 86
30
87A 87
85 86
3087A
FOLD RELAY POWER MIRROR
UNFOLD RELAY POWER MIRROR WASHER
MODULE
P
S31
30
56
87A
87A87A
8W - 12 - 2 8W-12 JUNCTION BLOCKNS/GS
J988W-3GS001202
FUSES
FUSE NO. AMPS FUSED CIRCUIT FEED CIRCUIT
110A INTERNALL78 20DG/YL
F11 20RD/WT
2
3
L78 20DG/YL
4
5
6INTERNAL
7C16 20LB/YL
8
10
C40 12BR/WT 9
F45 20YL/RD
INTERNAL 11
12
A81 20DG/RD
L7 12BK/YL
L7 12BK/YL
INTERNAL
INTERNAL
A41 12YL
A22 12BK/OR10A
15A
15A
15A
20A
10A
10A
10A
20A
10AINTERNAL L7 12BK/YL
INTERNAL V20 18RD 15AA21 12DB
A22 12BK/OR
-
9A-
- 9A 9A-
-
- 9A-
- - -
- 9
108 7-
6 54- 32- INTERNAL 9A
1
FEED CIRCUIT FUSED CIRCUIT AMPS PTC NO.(POSITIVE TEMPERATURE COEFFICIENT)PTC'S
F21 12TN-
FOG LAMPS F39 18PK/LG
INTERNALA21 12DB
INTERNAL
INTERNAL
INTERNALINTERNAL
INTERNAL
INTERNAL
INTERNAL
INTERNAL
L78 20DG/YL
L78 20DG/YL
F39 18PK/LG
C16 20LB/YL
NS/GS8W-12 JUNCTION BLOCK 8W - 12 - 3
GS001203J988W-3
in the engine compartment next to the battery (Fig.
30). A label affixed to the underside of the PDC cover
identifies the relays and fuses in the PDC.
GENERATOR FIELDÐPCM OUTPUT
The PCM regulates the charging system voltage
within a range of 12.9 to 15.0 volts. Refer to Group
8A for Battery system information and 8C for charg-
ing system information.
AUTOMATIC SHUTDOWN RELAYÐPCM OUTPUT
The Automatic Shutdown (ASD) relay supplies bat-
tery voltage to the fuel injectors, electronic ignition
coil and the heating elements in the oxygen sensors.
A buss bar in the Power Distribution Center (PDC)
supplies voltage to the solenoid side and contact side
of the relay. The ASD relay power circuit contains a
25 amp fuse between the buss bar in the PDC and
the relay. The fuse is located in the PDC. Refer to
Group 8W, Wiring Diagrams for circuit information.
The PCM controls the relay by switching the
ground path for the solenoid side of the relay on and
off. The PCM turns the ground path off when the
ignition switch is in the Off position unless the 02
Heater Monitor test is being run. Refer to Group 25,
On-Board Diagnostics. When the ignition switch is in
the On or Crank position, the PCM monitors the
crankshaft position sensor and camshaft position sen-
sor signals to determine engine speed and ignition
timing (coil dwell). If the PCM does not receive the
crankshaft position sensor and camshaft position sen-
sor signals when the ignition switch is in the Run
position, it will de-energize the ASD relay.The ASD relay is located in the PDC (Fig. 30). A
label affixed to the underside of the PDC cover iden-
tifies the relays and fuses in the PDC.
FUEL PUMP RELAYÐPCM OUTPUT
The fuel pump relay supplies battery voltage to the
fuel pump. The fuel pump relay power circuit con-
tains a 9 amp fuse. The fuse is located in the PDC.
Refer to Group 8W, Wiring Diagrams for circuit infor-
mation.
The PCM controls the fuel pump relay by switch-
ing the ground path for the solenoid side of the relay
on and off. The PCM turns the ground path off when
the ignition switch is in the Off position. When the
ignition switch is in the On position, the PCM ener-
gizes the fuel pump. If the crankshaft position sensor
does not detect engine rotation, the PCM de-ener-
gizes the relay after approximately one second.
The fuel pump relay is located in the PDC (Fig.
30). A label affixed to the underside of the PDC cover
identifies the relays and fuses in the PDC.
STARTER RELAYÐPCM OUTPUT
Double Start Override ia a feature that prevents
the starter from operating if the engine is already
running. This feature is accomplished with software
only. There was no hardware added because of this
feature. To incorporate the unique feature of Double
Start Override, it was necessary to use the PCM
(software) to control the starter circuit. To use the
PCM it was necessary to separate the starter relay
coil ground from the park neutral switch. The starter
relay ground is now controlled through Pin 60 of the
PCM. This allows the PCM to interrupt the ground
circuit if other inputs tell it that the engine is turn-
ing. If the starter system is operating properly, it can
be assumed that the override protection is also work-
ing.
IDLE AIR CONTROL MOTORÐPCM OUTPUT
The idle air control motor is mounted on the throt-
tle body. The PCM operates the idle air control motor
(Fig. 26) or (Fig. 27) or (Fig. 28). The PCM adjusts
engine idle speed through the idle air control motor
to compensate for engine load or ambient conditions.
The throttle body has an air bypass passage that
provides air for the engine at idle (the throttle blade
is closed). The idle air control motor pintle protrudes
into the air bypass passage and regulates air flow
through it.
The PCM adjusts engine idle speed by moving the
idle air control motor pintle in and out of the bypass
passage. The adjustments are based on inputs the
PCM receives. The inputs are from the throttle posi-
tion sensor, crankshaft position sensor, coolant tem-
perature sensor, and various switch operations
Fig. 30 Power Distribution Center (PDC)
14 - 42 FUEL SYSTEMNS
DESCRIPTION AND OPERATION (Continued)
(22) Check the accessory drive belt tension.
(23) Check the 40-way electrical connectors at the
Powertrain Control Module (PCM) (Fig. 59) for dam-
age or spread terminals. Verify that the connectors
are fully inserted into the PCM sockets. Ensure the
wires are not stretched or pulled out of the connector.
(24) Inspect fuses in the Power Distribution Cen-
ter (PDC). Verify all fuses and relays are fully
inserted into the PDC (Fig. 60). A label affixed to the
underside of the PDC cover identifies the relays and
fuses in the PDC.(25) Inspect battery cable connections for corro-
sion.
(26) Check the power brake booster hose connec-
tion (without anti-lock brake systems) (Fig. 61).
(27) Inspect the speed control vacuum connection.
(28) Inspect hose and wiring connections at fuel
pump module. Check that wiring connector is making
contact with terminals on pump.
Fig. 56 Map Sensor
Fig. 57 Upstream Heated Oxygen Sensor
Fig. 58 Downstream Heated Oxygen Sensor
Fig. 59 Powertrain Control Module (PCM)
Connectors
NSFUEL SYSTEM 14 - 51
DIAGNOSIS AND TESTING (Continued)
terminals. Verify the connectors are fully inserted
into the socket of the PCM (Fig. 74). Ensure that
wires are not stretched or pulled out of the connector.
(24) Inspect fuses in the Power Distribution Cen-
ter (PDC). Verify all fuses and relays are fully
inserted into the PDC (Fig. 74). A label affixed to the
underside of the PDC cover identifies the relays and
fuses in the PDC.
(25) Check Battery Cable Connections.
(26) Check hose and wiring connections at fuel
pump module. Check that wiring connector is making
contact with terminals on pump.
VISUAL INSPECTIONÐ3.3/3.8L ENGINES
A visual inspection for loose, disconnected, or mis-
routed wires and hoses should be made before
attempting to diagnose or service the fuel injection
system. A visual check helps save unnecessary test
and diagnostic time. A thorough visual inspection will
include the following checks:
(1) Check ignition cable routing from the coil pack
to the spark plugs. Verify the cable are routed in the
correct order and are fully seated to the coil and
spark plug.(2) Check direct ignition system (DIS) coil electri-
cal connection for damage and a complete connection
to the coil pack (Fig. 75).
(3) Verify the camshaft position sensor electrical
connector is connected to the harness and not dam-
aged (Fig. 76).
(4) Ensure the engine temperature sensor electri-
cal connector is connected to the sensor and not dam-
aged (Fig. 77).
(5) Verify the quick connect fuel fitting is fully
inserted on the fuel supply tube.
(6) Check the oil pressure sending unit electrical
connection (Fig. 78).
Fig. 74 Powertrain Control Module (PCM)
Fig. 75 Ignition Coil Pack Electrical Connection
Fig. 76 Camshaft Position Sensor
NSFUEL SYSTEM 14 - 55
DIAGNOSIS AND TESTING (Continued)
(19) Check the heated oxygen sensor electrical con-
nectors for damage (Fig. 87) and (Fig. 88).(20) Verify the engine ground strap is attached at
the engine and dash panel. Inspect the strap for cor-
rosion or damage.
(21) Inspect the generator wiring connections for
damage.
(22) Check the accessory drive belt tension.
(23) Check the 40-way electrical connectors at the
Powertrain Control Module (PCM) (Fig. 89) for dam-
age or spread terminals. Verify that the connectors
are fully inserted into the PCM sockets. Ensure the
wires are not stretched or pulled out of the connector.
(24) Inspect fuses in the Power Distribution Cen-
ter (PDC). Verify all fuses and relays are fully
Fig. 85 Crankshaft Position Sensor
Fig. 86 MAP Sensor
Fig. 87 Upstream Heated Oxygen Sensor
Fig. 88 Downstream Heated Oxygen Sensor
Fig. 89 Powertrain Control Module (PCM)
Connectors
14 - 58 FUEL SYSTEMNS
DIAGNOSIS AND TESTING (Continued)