Engine Oil Sensor Performance

(P0521) ENGINE OIL SENSOR PERFORMANCE





When Monitored and Set Condition
^ 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 DRBIII, read PCM DTCs.
Is this DTC present?
Yes >> For complete diagnosis of this DTC, refer to (P0521) ENGINE OIL SENSOR QUALITY PERFORMANCE. 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.

Note: Check for any Technical Service Bulletins that may apply.

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.