P0521
P0521-OIL PRESSURE SWITCH RATIONALITYP0521 - Oil Pressure Switch Rationality:
WHEN MONITORED
While the key is on.
SET CONDITION
Oil pressure is detected with engine RPM = 0 for 30 seconds.
POSSIBLE CAUSES
- Oil pressure switch
- (G6) Signal circuit open
- Intermittent condition
- ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. OIL PRESSURE SWITCH
Turn the ignition off.
Disconnect the Oil pressure switch harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance between the oil pressure switch terminal and ground.
Q: Is the resistance less than 10 ohms?
YES: Go To 2
NO: Replace the oil pressure switch. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
2. (G6) SIGNAL CIRCUIT OPEN
Disconnect the ECM harness connectors.
Check connectors - Clean/repair as necessary.
Measure the resistance of the oil pressure switch (G6) signal circuit between the oil pressure switch harness connector and the ECM harness connector.
Q: Is the resistance less than 10 ohms?
YES: Go To 3
NO: Repair the open Oil pressure (G6) signal circuit. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
3. ECM
Reconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage between the oil pressure (G6) signal circuit at the oil pressure switch harness connector and ground.
Q: Is the voltage between 4.5 and 5.5 volts?
YES: Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
NO: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1