Jeep Liberty KJ. Manual — part 766
•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects low voltage on the Sensor Supply #1 circuit which supplies 5-volts to the CMP Sensor and
the APP Sensor #1.
Possible Causes
WIRING INSPECTION
INTERMITTENT CONDITION
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
ACCELERATOR PEDAL POSITION SENSOR
CAMSHAFT POSITION SENSOR
ENGINE CONTROL MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
CAMSHAFT POSITION SENSOR SHORTED TO GROUND
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CMP Sensor 5-Volt Supply circuit.
Is the voltage above 4.6 volts?
Yes
>> Replace the Camshaft Position Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 1122
ENGINE DIESEL DIAG
KJ
3.
ACCELERATOR PEDAL POSITION SENSOR SHORTED TO GROUND
Ensure all connectors are reconnected.
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the APP Sensor #1 5-Volt Supply circuit.
Is the voltage above 4.6 volts?
Yes
>> Replace the Accelerator Pedal Position Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 4
4.
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the CMP Sensor 5-Volt
Supply circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 5
No
>> Repair the 5-Volt Supply circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1123
5.
WIRING INSPECTION
Turn the ignition off.
Inspect the CMP Sensor 5-Volt supply circuit between the CMP harness connector and the ECM harness connector
for possible shorts to other circuits.
Inspect the APP Sensor #1 5-Volt supply circuit between the APP Sensor harness connector and the ECM harness
connector for possible shorts to other circuits.
Were any problems found?
Yes
>> Repair shorted circuit as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
9 - 1124
ENGINE DIESEL DIAG
KJ
P0645-A/C CLUTCH RELAY CIRCUIT EXCESSIVE CURRENT
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1125
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