P1188

Electrical Diagram:

CIRCUIT DESCRIPTION

The Engine Oil Pressure sensor is mounted in the top rear of the engine and measures changes in engine oil pressure. The Engine Oil Pressure sensor has a 5.0 volt reference, a ground and a signal circuit. The sensor changes resistance based on engine oil pressure. When the PCM senses a signal voltage higher than the normal operating range of the sensor, this DTC will set.


CONDITIONS FOR SETTING THE DTC

^ Engine running.

^ Engine Oil Pressure sensor is greater than 4.5 volts.


ACTION TAKEN WHEN THE DTC SETS

^ The PCM stores the DTC information into memory when the diagnostic runs and fails.

^ The Malfunction Indicator Lamp (MIL) will not illuminate.

^ The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.

^ The Driver Information Center will display a message.


CONDITIONS FOR CLEARING THE MIL/DTC

^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.

^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.

^ The PCM battery voltage is interrupted.

^ Use a scan tool in order to clear the MIL/DTC.

DIAGNOSTIC AIDS:

^ The following may cause an intermittent:

- Mis-routed harness.

- Rubbed through wire insulation.

- Broken wire inside the insulation.

^ The PCM 5.0 volt reference circuits are internally connected within the PCM. If all the Engine Oil Pressure sensor circuits check to be OK, inspect related 5.0 volt reference circuits. Refer to DTC P1635. P1635


TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

3. This step determines if the malfunction is present. For any test that requires probing of the PCM or any component harness connectors, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness connector terminals.

4. Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed.

5. This step checks if the signal circuit is shorted to a voltage.

6. This step checks if a ground circuit is available at the Engine Oil Pressure sensor.