P0523

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The engine oil pressure sensor is a solid state transducer. The engine oil pressure sensor sends oil pressure information to the PCM. The PCM then transmits the oil pressure information to the IPC via serial data.

Engine oil pressure is displayed on the scan tool in volts. A low voltage reading indicates low oil pressure. As the oil pressure increases, the voltage level also increases. The normal range of the engine oil level sensor signal voltage is 0.5 volts at 0 kPa (0 psi) to 4.5 volts at 883 kPa (128 psi).

CONDITIONS FOR RUNNING
^ The engine is running.
^ There are no 5 Volt Reference A codes set.

CONDITIONS FOR SETTING
^ The engine oil pressure sensor voltage is equal to or more than 4.6 volts.
^ The above condition exists for 9 seconds

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the malfunction indicator lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
Check for the following conditions:
^ A faulty connection at the PCM or the engine oil pressure sensor.
Inspect the harness connectors for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals. Use a corresponding mating terminal to test for proper terminal tension.
- Faulty terminal to wire connections
^ A damaged harness - Inspect the wiring harness for damage. Monitor the scan tool while moving the related harnesses. A sudden change in the Engine Oil Pressure voltage indicates the area of the harness where a problem exists.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
12. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.