Jeep Liberty KJ. Manual — part 740
•
When Monitored:
At engine start-up.
•
Set Condition:
The oil pressure signal is below 0.19 volts for 8 seconds after engine start-up.
Possible Causes
5-VOLT SUPPLY CIRCUIT OPEN
BCM - OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
BCM - OIL PRESSURE SENSOR SIGNAL SHORT TO GROUND
MECHANICAL PROBLEM
OIL PRESSURE SENSOR FAILURE
OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
SENSOR GROUND CIRCUIT OPEN
INTERMITTENT CONDITION
Diagnostic Test
1.
CHECKING FOR CURRENT DTC
NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs P0641 and P0651 before diagnosing
this 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.
Start the engine several times, letting the engine run for at least 30 seconds at a time.
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.
MECHANICAL PROBLEM
Refer to the Service Information and perform the Oil Pressure Test.
Is the oil pressure within specification?
Yes
>> Go To 3
No
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
9 - 1018
ENGINE DIESEL DIAG
KJ
3.
CHECKING OP SENSOR SIGNAL CKT
Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Oil Pressure Sensor Signal circuit.
Select the appropriate voltage reading.
Voltage is above 5.5 volts.
Go To 4
Voltage is between 4.7 and 5.4 volts.
Go To 5
Voltage is below 4.7 volts.
Go To 7
4.
OP SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Disconnect the BCM 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 of the Oil Pressure Sensor Signal circuit.
Is the voltage below 1.0 volt?
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
voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1019
5.
5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance of the 5-Volt Supply circuit between the BCM
harness connector and the Oil Pressure Sensor harness connector.
Is the resistance below 10.0 ohms?
Yes
>> Go To 6
No
>> Repair the 5-Volt Supply circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
6.
SENSOR GROUND CKT 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 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).
9 - 1020
ENGINE DIESEL DIAG
KJ
7.
OP SENSOR SIGNAL CKT 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
>> Go To 8
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).
8.
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 9
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).
KJ
ENGINE DIESEL DIAG
9 - 1021
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