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(P0521) ENGINE OIL SENSOR QUALITY PERFORMANCE (CONTINUED) 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 For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA- Diagnostic Test 1. PRE-DIAGNOSTIC CHECK OUT Note: Always perform diagnostics with a fully charged battery. Note: Check connectors — Clean/repair as necessary. Poor pin to Note: Check for applicable TSBs related to the problem. With the DRB III T , read PCM DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and Perform this procedure prior to symptom diagnosis. Continue Go To 2 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 533 |