P0523

DTC P0523

CIRCUIT DESCRIPTION
The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The powertrain control module (PCM) monitors the signal circuit of the EOP sensor. When the engine oil pressure is high, the sensor resistance is high and the PCM senses a high signal voltage. When the engine oil pressure is low, the sensor resistance is low and the PCM senses a low signal voltage. The PCM sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2 serial data circuit.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage

CONDITIONS FOR RUNNING THE DTC
- The engine is running.
- DTC P1635 for the 4.3L or DTC P0641 for the 4.8L, 5.3L and 6.0L is not present.

CONDITIONS FOR SETTING THE DTC
- The PCM detects that the EOP sensor signal circuit is greater than 4.6 volts.
- The above condition is present for greater than 9 seconds.

ACTION TAKEN WHEN THE DTC SETS
The PCM records the operating conditions at the time that the diagnostic test fails. The PCM displays this information in the Failure Records on the scan tool.

CONDITIONS FOR CLEARING THE DTC
- 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 PCM receives the clear code command from the scan tool.

DIAGNOSTIC AIDS
- Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help in determining how many miles since the DTC set. The Fail Counter and the Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

TEST DESCRIPTION

Steps 1 - 11:

The number below refers to the step number on the diagnostic table.
3. This step tests for the proper operation of the circuit in the low voltage range.