• | 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 |
---|---|---|---|---|
Oil Pressure Switch Signal | 1 | P0520 | 1 | -- |
Low Reference | -- | P0520 | -- | -- |
1. Engine Oil Pressure Indicator Malfunction |
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. 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 low. |
• | 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 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. |
Control Module References for scan tool information
Ignition ON, engine running, verify the scan tool Engine Oil Pressure Switch parameter is OK.
⇒ | If not the specified value, refer to Oil Pressure Diagnosis and Testing. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the PCM. |
⇒ | If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the PCM. |
⇒ | If not the specified value, test the signal circuit for an open/high resistance. If circuit test normal, replace the PCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for the PCM replacement, setup, and programming |