• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Engine Oil Pressure Sensor Signal Circuit | -- | P0520 | P0520 | -- |
Engine Oil Pressure Sensor Ground Circuit | -- | P0520 | -- | -- |
The engine oil pressure (EOP) switch is a normally closed switch that opens with the proper oil pressure. With the ignition switch turned ON and the engine not running, the powertrain control module (PCM) should detect a low signal voltage input. With the engine running, the oil pressure switch opens and the PCM detects a high signal voltage input. The PCM tests the state of the EOP signal circuit with the ignition switch turned ON, and the engine turned OFF. When the oil pressure is low, the PCM sends a serial data message to the instrument panel cluster (IPC) requesting the EOP indicator turned ON. The IPC illuminates the EOP indicator when the IPC receives a serial data message from the PCM requesting the EOP indicator turned ON.
• | The ignition is ON, with the engine ON. |
• | Engine temperature is 10°C (50°F) less than the last key off temperature. |
• | The PCM detects that the EOP switch signal circuit is pulled high. |
• | The above condition is present for greater than 10 seconds. |
• | The PCM records the operating conditions at the time the diagnostic test fails. The PCM displays this information in the Failure Records on the scan tool. |
• | The instrument panel cluster (IPC) displays the engine oil pressure indicator. |
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC clears after 40 malfunction-free warm-up cycles. |
Important: Do not turn the key to the crank position or engage the starter at any time during diagnosis.
⇒ | If greater than the specified value, test the ground circuit terminal B for an open/high resistance. |
⇒ | If not Low, test the signal circuit terminal A for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for the PCM replacement, setup, and programming |