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Diagnostic Procedure

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DIAGNOSTIC PROCEDURES - P0520-OIL PRESS SENSOR CIRCUIT MALF PLAUSIBILITY

TEST ACTION APPLICABILITY
1
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 DRB 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 DRB, erase ECM DTCs.Start the engine several times, letting the engine run for at least 30 seconds at a time.With the DRB, read ECM DTCs.Did this DTC set again?Yes --> Go To 2No --> Go To 10		 All
2 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 ROAD TEST VERIFICATION - VER-2 .		 All
3 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		 All
4 Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Disconnect the FCM 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 Front Control Module in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Repair the Oil Pressure Sensor Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
5 Turn the ignition off.
Disconnect the FCM harness connectors.
Disconnect the Oil Pressure Sensor harness connector.
Measure the resistance of the 5-Volt Supply circuit between the FCM 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 ROAD TEST VERIFICATION - VER-2 .		 All
6 Turn the ignition off.
Disconnect the FCM 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 ROAD TEST VERIFICATION - VER-2 .
No --> Repair the Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
7 Turn the ignition off.
Disconnect the FCM 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 ROAD TEST VERIFICATION - VER-2 .		 All
8 Turn the ignition off.
Disconnect the FCM 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 ROAD TEST VERIFICATION - VER-2 .		 All
9 Turn the ignition off.
Disconnect the FCM 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 Front Control Module in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Repair the Oil Pressure Sensor Signal circuit for a short to the Sensor Ground circuit.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
10
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Test Complete.		 All
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