DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 114

DRIVEABILITY - DIESEL
P0520-OIL PRESS SENSOR CKT MALF SIGNAL VOLTAGE TOO HIGH —
Continued
TEST
3 Turn the ignition off.
Disconnect the Oil Pressure 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 of the Oil Pressure Sensor Signal circuit.
Is the voltage below 1.0 volt?
Yes → Replace and program the Engine Control Module in accordance
→ Repair the Oil Pressure Sensor Signal circuit for a short to
No
4 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
Yes → Replace the Engine Oil Pressure Sensor.
→ Repair the Sensor Ground circuit for an open.
No
5 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance of the Oil Pressure Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes → Replace and program the Engine Control Module in accordance
→ Repair the Oil Pressure Sensor Signal circuit for an open.
No
ACTION
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
106
APPLICABILITY
All
All
All