Engine Oil Pressure Sensor/Switch Diagnosis

Refer to Engine Controls Schematic IAC PCM ENG OIL LVL Engine Oil Pressure.

Diagnostic Chart:

CIRCUIT DESCRIPTION
The PCM applies battery voltage through a pull up resistor to the Engine Oil Pressure (EOP) switch circuit. The PCM monitors the applied voltage on the EOP switch circuit. If the ignition switch is turned ON with the engine not running or engine oil pressure is below 35 kPa (5 psi), the EOP switch grounds the PCM voltage input. The PCM sends the EOP information through the Class II serial data to the Instrument Panel (IP) Cluster. The IP Cluster controls the EOP indicator.

DIAGNOSTIC AIDS
Inspect for the following conditions:

IMPORTANT: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ Poor terminal connection-Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension.
^ Damaged harness-Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault.
^ PCM and engine grounds for clean and secure connections

If the DTC is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set.