• | 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 5-Volt Reference Circuit | P0522 | P0522 | P0523 | -- |
Engine Oil Pressure Sensor Signal Circuit | P0522 | P0523 | P0523 | -- |
Low Reference | -- | P0523 | -- | -- |
The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The engine control module (ECM) monitors the signal circuit of the EOP sensor. When the oil pressure is high, the sensor resistance is high, and the ECM senses a high signal voltage. When the oil pressure is low, the sensor resistance is low, and the ECM senses a low signal voltage. The ECM sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2 serial data circuit.
• | The engine is running. |
• | DTC P1635 is not present. |
• | The ECM detects that the EOP sensor signal circuit is greater than 4.6 volts. |
• | The above condition is present for greater than 9 seconds. |
The ECM records the operating conditions at the time that the diagnostic test fails. The ECM displays this information in the Failure Records on the scan tool.
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC is cleared after 40 malfunction-free warm-up cycles. |
• | The ECM receives the clear code command from the scan tool. |
⇒ | If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM. |
⇒ | If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If greater than 10 kPa (1.5 psi), test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for the ECM replacement, setup, and programming |