Engine Oil Sensor Performance

P0521 - ENGINE OIL SENSOR PERFORMANCE

P0521 - Engine Oil Sensor Performance:

WHEN MONITORED
With the engine running.

SET CONDITION
Anytime the Powertrain Control Module (PCM) senses the Oil Quality value is above 4.0.

NOTE: The engine oil must be changed before this test can be accurately conducted.

POSSIBLE CAUSES
- Water in the oil
- Contaminated oil
- Oil sensor signal circuit open
- Oil sensor signal circuit short to ground
- Oil sensor signal circuit short to voltage
- 5-volt supply circuit open
- 5-volt supply circuit short to ground
- 5-volt supply circuit short to voltage
- 5-volt supply circuit short to sensor ground circuit
- Oil sensor signal circuit short to sensor ground circuit
- Oil sensor signal circuit short to 5-volt supply circuit
- Sensor ground circuit open
- Manifold absolute pressure sensor
- Engine oil sensor
- Powertrain control module


DIAGNOSTIC TEST




1. CHECK FOR CURRENT DTC

Turn the ignition on.
With the DRB III(R), read PCM DTCs.

Q: Is this DTC present?

YES: For complete diagnosis of this DTC, refer to (P0521) ENGINE OIL SENSOR QUALITY PERFORMANCE.

NO: Go To 2

2. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

NOTE:
- Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and open circuits.
- Check for any Technical Service Bulletins that may apply.

Q: Were there any problems found?

YES: Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test - Ver 2

NO: The condition that caused this DTC to set is currently not present. Inspect the Related wiring harness for a possible intermittent condition.