P0523

DTC P0523

CIRCUIT DESCRIPTION
The engine oil pressure (EOP) sensor changes voltage 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 voltage is high, and the ECM senses a high signal voltage. When the oil pressure is low, the sensor voltage is low, and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via the GMLAN 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.

CONDITIONS FOR SETTING THE DTC
- The ECM detects that the EOP sensor signal circuit is greater than 4.8 volts.
- The above condition is present for greater than 10 seconds.

ACTION TAKEN WHEN THE DTC SETS
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.

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 ECM 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.

Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

TEST DESCRIPTION

Step 1 - Step 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.