Jeep Liberty KJ. Manual — part 765
P0641-SENSOR SUPPLY 1 VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
9 - 1118
ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects a short to voltage for 0.1 second on the Sensor Supply #1 circuit which supplies 5-volts to
the CMP Sensor and the APP Sensor #1.
Possible Causes
WIRING INSPECTION
APP SENSOR #1 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
CMP SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
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.
Turn the ignition off for 10 seconds.
Turn the ignition on.
Monitor the scan tool for ECM DTCs.
Did this DTC reset?
Yes
>> Go To 2
No
>> Go To 4
2.
APP #1 SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Accelerator Pedal Position Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage on the Accelerator Pedal Position Sensor #1 5-Volt
Supply circuit.
NOTE: Remove the jumper wire and reinstall the ASD Relay.
Is the voltage below 1.0 volt?
Yes
>> Go To 3
No
>> Repair the APP #1 5-Volt Supply circuit for a short to volt-
age.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1119
3.
CMP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Camshaft Position Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage on the Camshaft Position Sensor 5-Volt Supply cir-
cuit.
NOTE: Remove the jumper wire and reinstall the ASD Relay.
Is the voltage below 1.0 volt?
Yes
>> Go To 4
No
>> Repair the CMP Sensor 5-Volt Supply circuit for a short to
voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
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 - 1120
ENGINE DIESEL DIAG
KJ
P0641-SENSOR SUPPLY 1 VOLTAGE TOO LOW
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1121
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