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8W - 30 - 18
DESCRIPTION AND OPERATION
AMBIENT (BATTERY) TEMPERATURE
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
AUTOMATIC SHUT-DOWN RELAY . . . . . . . . . . . 19
BATTERY FEED . . . . . . . . . . . . . . . . . . . . . . . . . 18
CAMSHAFT POSITION SENSOR (2.4L) . . . . . . . 20
CAMSHAFT POSITION SENSOR (2.5L) . . . . . . . 20
CCD BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
CRANKSHAFT POSITION SENSOR . . . . . . . . . . 20
DISTRIBUTOR (2.5L) . . . . . . . . . . . . . . . . . . . . . 22
DUTY CYCLE EVAP/PURGE SOLENOID . . . . . . 23
ELECTRONIC EGR TRANSDUCER (EET)
SOLENOID . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
ENGINE COOLANT TEMPERATURE SENSOR . . 20
FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . . 22
DESCRIPTION AND OPERATION
IGNITION SWITCH
When the ignition switch is in the START/RUN
position, it connects circuit A1 from the Power Distri-
bution Center (PDC) to circuit A21 through the igni-
tion switch. A 20 amp fuse in cavity 8 of the PDC
protects circuits A1 and A21. Circuit A1 is spliced
and provides power to the fuel pump relay, Power-
train Control Module (PCM), and the engine starter
motor relay.
The A21 circuit connects from the ignition switch
to the junction block on circuit F12. The F12 circuit
is protected by a 10 amp fuse located in cavity 10.
Circuit F12 is spliced and connects to the Powertrain
Control Module (PCM), fuel pump relay, and the ABS
Control Module, and distributor (2.5L only).
BATTERY FEED
Circuit A14 is used to provide a constant battery
feed to the Powertrain Control Module (PCM). This
circuit originates in the Power Distribution Center
(PDC) and is protected by a 20 amp fuse located in
cavity 5. It is also spliced and provides power for the
Automatic Shut- Down (ASD) relay, coil and contact
sides.
POWER (DEVICE) GROUND
Circuit Z12 connects to cavities 10 and 50 of the
Powertrain Control Module (PCM) connector. The
Z12 circuits provides ground for the PCM internal
drivers that operate high current devices like fuel
injectors and ignition coils.
8W - 30 FUEL/IGNITION SYSTEM
8W-30 FUEL/IGNITION SYSTEM
INDEX
page
FUEL PUMP MOTOR . . . . . . . . . . . . . . . . . . . . . 19
HEATED OXYGEN SENSORS . . . . . . . . . . . . . . 19
IDLE AIR CONTROL MOTOR . . . . . . . . . . . . . . . 22
IGNITION COIL PACK (2.4L) . . . . . . . . . . . . . . . . 22
IGNITION SWITCH . . . . . . . . . . . . . . . . . . . . . . . 18
INTAKE AIR TEMPERATURE SENSOR . . . . . . . . 21
KNOCK SENSOR (2.4L only) . . . . . . . . . . . . . . . 21
MANIFOLD ABSOLUTE PRESSURE SENSOR . . 21
PARK/NEUTRAL SWITCH INPUT . . . . . . . . . . . . 23
POWER (DEVICE) GROUND . . . . . . . . . . . . . . . 18
POWER STEERING PRESSURE SWITCH . . . . . 23
THROTTLE POSITION SENSOR . . . . . . . . . . . . 21
UNIVERSAL DATA LINK CONNECTOR . . . . . . . . 18
VAPOR CANISTER LEAK DETECTOR . . . . . . . . 23
VEHICLE SPEED INPUT . . . . . . . . . . . . . . . . . . 19
Internal to the PCM, the power (device) ground cir-
cuit connects to the PCM sensor return circuit from
circuit K4.
HELPFUL INFORMATION
Circuit Z12 which supplies a ground for the PCM
high current drivers, terminates at the left strut
tower.
If the system loses ground for the Z12 circuit the
vehicle will not operate.
UNIVERSAL DATA LINK CONNECTOR
Circuit M1 supplies battery voltage to the univer-
sal data link connector. This circuit is protected by a
10 amp fuse located in cavity 5 of the junction block.
Circuit M1 is the Ignition-Off Draw circuit and sup-
plies power to the Body Control Module (BCM), radio
memory, interior lamps, and other components.
A twisted pair of wires, circuits D1 and D2, connect
to the data link connector. These wires are connected
to the CCD Bus. The CCD Bus is used for diagnosing
vehicle components and modules.
Circuits D20 and D21 from the Powertrain Control
Module (PCM) connect to the data link connector.
Circuit D20 connects to cavity 75 of the PCM and is
the SCI receive circuit. Circuit D21 connects to cavity
65 of the PCM and is the SCI transmit. The D21 cir-
cuit is also spliced and connects to the Transmission
Control Module (TCM), and the Controller Anti Lock
Brakes (CAB), if equipped.
The D6 circuit is also connected to the universal
data link connector. This cirucit is used as a SCI line
from the TCM.
JX
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