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TJ
DESCRIPTION AND OPERATION
AUTOMATIC SHUT DOWN (ASD) RELAY . . . . . . . 2
BATTERY FEED . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BATTERY TEMPERATURE SENSOR . . . . . . . . . . 3
CAMSHAFT POSITION SENSOR . . . . . . . . . . . . . 3
CCD BUS . . . . . . . . .
. . . .
. . . .
. . .
.
. . . . . .
. . . 5
CRANKSHAFT POSITION SENSOR . . . . . . . . . . . 3
DATA LINK CONNECTOR . . . . . . . . . . . . . . . . . . . 1
DUTY CYCLE EVAP\PURGE SOLENOID . . . . . . . 5
ENGINE COOLANT TEMPERATURE SENSOR . . . 3
FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . . . 5
FUEL PUMP MODULE . . . . . . . . . . . . . . . . . . . . . 2
FUEL PUMP RELAY . . . . . . . . . . . . . . . . . . . . . . . 2
HEATED OXYGEN SENSORS . . . . . . . . . . . . . . . 2
IDLE AIR CONTROL (IAC) MOTOR . . . . . . . . . . . 5
DESCRIPTION AND OPERATION
8W - 30 FUEL/IGNITION SYSTEMS
IGNITION SWITCH
Circuit A1 from fuse 3 in the Power Distribution
Center (PDC) and circuit A2 from PDC fuse 2 supply
battery voltage to the ignition switch. Depending
upon position, the ignition switch powers circuits
A21, A22, A31, or A41 .
START POSITION
In the START position, the ignition switch connects
circuit A2 to circuit A41 . Circuit A41 connects to cir-
cuit T141 which powers the coil side of the starter
motor relay.
Additionally in the START position, the case
grounded ignition switch provides ground for the
brake warning lamp switch .
START OR RUN POSITION
In the START or RUN position, the ignition switch
connects circuit A1 to circuit A21 . Circuit A21 feeds
fuses 9, 10, and 11 in the fuse block.
RUN (ONLY) POSITION
When the ignition switch is in the RUN position, it
connects circuit A2 to circuit A22 . Circuit A22 feeds
fuses 5, 6, 7, and 8 in the fuse block.
ACCESSORY OR RUN POSITIONS
In the ACCESSORY or RUN positions, the ignition
switch connects circuit A1 to circuit A31 . Circuit A31
feeds fuses 13, 14 and 15 in the fuse block and the
accessory relay.
8W-30 FUEL/IGNITION SYSTEMS
INDEX
page
8W - 30 - 1
page
IGNITION COIL . . . . . . . . . . . . . . . . . . . . . . . . . . 5
IGNITION SWITCH . . . . . . . . . . . . . . . . . . . . . . . . 1
INTAKE AIR TEMPERATURE SENSOR . . . . . . . . . 4
MANIFOLD ABSOLUTE PRESSURE SENSOR . . . 4
OIL PRESSURE GAUGE . . . . . . . . . . . . . . . . . . . 4
PARKMEUTRAL POSITION SWITCH . . . . . . . . . . 4
PCM GROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
POWER STEERING PRESSURE SWITCH . . . . . . 5
STOP LAMP SWITCH INPUT . . . . . . . . . . . . . . . . 5
THROTTLE POSITION SENSOR . . . . . . . . . . . . . 4
TORQUE CONVERTER CLUTCH (TCC)
SOLENOID . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
VEHICLE SPEED SENSOR . . . . . . . . . . . . . . . . . 2
SCHEMATICS AND DIAGRAMS
WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 5
BATTERY FEED
Circuit A14 from fuse 6 in the Power Distribution
Center (PDC) supplies battery voltage to cavity A22
of the Powertrain Control Module (PCM) .
HELPFUL INFORMATION
Circuit A14 also supplies power to the contact sides
of the Automatic Shut Down (ASD) relay.
PCM GROUND
Circuit Z12 connects to cavities A31 and A32 of the
PCM . The Z12 circuit provides ground for PCM inter-
nal drivers that operate high current devices like the
injectors and ignition coil .
Internal to the PCM, the ground circuit connects to
the PCM sensor return circuit (from circuit K167).
HELPFUL INFORMATION
" The grounding point for circuit Z12 is the right
rear of the engine block .
" If the system loses ground for the Z12 circuits at the
rear of the engine, the vehicle will not operate . Check the
connection at the ganged-ground circuit eyelet.
DATA LINK CONNECTOR
Circuit M1 from the Ignition Off Draw (IOD) fuse
in cavity 17 of the Power Distribution Center (PDC)
supplies battery voltage to the data link connector.
Circuit D20 connects to cavity C29 of the PCM. Cir-
cuit D20 is the SCI receive circuit for the Powertrain
Control Module (PCM). Circuit D21 connects to cavity
C27 of the PCM and cavity A3 of the Controller, Anti
Lock Brakes (CAB) . Circuit D21 is the SCI transmit cir-
cuit for the PCM . CCD Bus Circuits D1 and D2 connect
to the data link connector.
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Troubleshooting
