Jeep Liberty KJ. Manual — part 742
4.
SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes
>> Replace the Engine Oil Pressure Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance of the Oil Pressure Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
>> Replace and program the Body Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Oil Pressure Sensor Signal circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 1026
ENGINE DIESEL DIAG
KJ
P0520-OIL PRESS SENSOR CKT MALF SIGNAL VOLTAGE TOO LOW
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1027
•
When Monitored:
With the engine running.
•
Set Condition:
The Oil Pressure Sensor signal is below 0.19 volt for 0.5 seconds.
Possible Causes
ENGINE OIL PRESSURE SENSOR
BCM - OIL PRESSURE SENSOR SIGNAL SHORT TO GROUND
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
INTERMITTENT CONDITION
Diagnostic Test
1.
CHECK FOR CURRENT 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.
Perform several engine run cycles, turning the ignition off for at least 10 seconds between run cycles.
With the scan tool, read 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.
ENGINE OIL PRESSURE SENSOR
Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Measure the voltage of the Oil Pressure Sensor Signal circuit.
Is the voltage between 4.7 and 5.3 volts?
Yes
>> Replace the Engine Oil Pressure Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 1028
ENGINE DIESEL DIAG
KJ
3.
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance between ground and the Oil Pressure Sensor
Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 4
No
>> Repair the Oil Pressure Sensor Signal circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance between Sensor Ground and the Oil Pressure
Sensor Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Replace and program the Body Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Oil Pressure Sensor Signal circuit for a short to
Sensor Ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1029
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