Jeep XJ. Manual — part 859
Symptom:
*CHECKING THE PCM POWER AND GROUNDS
POSSIBLE CAUSES
PCM FUSED B+ CIRCUIT
PCM FUSED IGNITION SWITCH OUTPUT CIRCUIT
PCM GROUND CIRCUITS
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the PCM harness connector.
Using a 12-volt test light connected to ground, probe the PCM Fused B+ circuit in the
PCM harness connector.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Fused B+ circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Turn the ignition off.
Disconnect the PCM harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the PCM Fused Ignition Switch
Output circuit in the PCM harness connector.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Ignition Switch Output circuit
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3
Turn the ignition off.
Disconnect the PCM harness connector.
Using a 12-volt test light connected to battery voltage, probe the PCM ground circuits
in the PCM harness connector.
Does the test light illuminate brightly?
All
Yes
→
Test Complete.
No
→
Repair the PCM ground circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
197
DRIVEABILITY - GAS
Symptom:
*CHECKING THROTTLE POSITION SENSOR OPERATION WITH
NO DTC’S
POSSIBLE CAUSES
THROTTLE POSITION SENSOR VOLTAGE ABOVE 1.5 VOLTS
THROTTLE POSITION SENSOR SWEEP
TP SENSOR
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure that the throttle and linkage is not binding and is operating
properly.
Turn the ignition on.
With the DRBIII
t, read the Throttle Position Sensor voltage.
Is the voltage above 1.5 volts?
All
Yes
→
Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
2
Turn the ignition on.
With the DRBIII
t, monitor the Throttle Position Sensor voltage.
Slowly open the throttle from the idle position to the wide open throttle position.
Does voltage start at approximately 0.8 volts and go above 3.5 volts with a smooth
voltage change?
All
Yes
→
Test Complete.
No
→
Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
198
DRIVEABILITY - GAS
Symptom:
P0645-A/C CLUTCH RELAY CIRCUIT
When Monitored and Set Condition:
P0645-A/C CLUTCH RELAY CIRCUIT
When Monitored:
With the ignition key in the run position and battery voltage above 10.4
volts.
Set Condition:
An open or shorted condition is detected in the A/C clutch relay control
circuit.
POSSIBLE CAUSES
A/C CLUTCH RLY CIRCUIT WIRING HARNESS OBSERVABLE PROBLEM
A/C CLUTCH RLY CIRCUIT WIRING HARNESS INTERMITTENT PROBLEM
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
A/C CLUTCH RELAY CONTROL CIRCUIT OPEN
A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND
A/C CLUTCH RELAY
PCM (A/C CLUTCH RELAY)
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running
With the DRBIII
t, actuate the A/C Clutch Relay.
Is the A/C Clutch Relay clicking?
All
Yes
→
No
→
2
Turn the ignition off.
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
3
Ignition on, engine not running.
With the DRBIII
t, actuate the A/C Clutch Relay.
Wiggle the Wiring Harness from the Relay to the PCM.
Did the wiggling interrupt the clicking?
All
Yes
→
Repair as necessary where wiggling caused the clicking to be
interrupted.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Test Complete.
199
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C Clutch harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the Fused Ignition Switch Output Circuit voltage at A/C clutch relay.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the open Fused Ignition Switch Output Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
5
Turn the Ignition Off.
Disconnect the A/C Clutch Relay harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between Terminals 1(85) and 2 (86) of the A/C Clutch Relay.
Is the resistance between 50.0 and 90.0 ohms?
All
Yes
→
No
→
Replace the A/C Clutch Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
6
Turn the ignition off.
Disconnect the PCM harness connector(s).
Remove the A/C Clutch Relay from the PDC.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the A/C Clutch Relay Control Circuit from the Relay
harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open A/C Clutch Relay Control Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
Turn the Ignition Off.
Disconnect the PCM harness connector(s).
Disconnect the A/C Clutch Relay harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the A/C Clutch Control Circuit resistance at PCM connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the A/C Clutch Relay Control Circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
8
If there are no possible causes remaining, replace the Powertrain Control Module.
View repair options.
All
Repair
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
200
HEATING & A/C
P0645-A/C CLUTCH RELAY CIRCUIT —
Continued
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