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| Illustration 1 | g00527056 |
System Schematic For The Engine Oil Pressure Sensor (EOPS) | |
This diagnostic code is for the pressure sensor (engine oil).
The EMCP II+ monitors the engine oil pressure in order to protect the engine from a problem with the oil pressure. The oil pressure sensor is mounted on an oil gallery of the engine. The exact location of the engine oil pressure sensor varies depending on the engine model.
The sensor is powered by an 8 volt sensor supply from the GSC+. The oil pressure signal is a pulse width modulated signal. The base frequency of the signal is 500 ± 150 Hz. As pressure changes, the duty cycle of the signal varies from 10 to 95 percent.
- 0 kPa (0 psi) is approximately a duty cycle of 13%. The voltage will be approximately 1.0 DCV.
- 690 kPa (100 psi) is approximately a duty cycle of 85%.
System Response:
Note: The GSC+ is usually programmed to treat a problem with the oil pressure sensor as an alarm fault. The factory default for P004 is 0. If the GSC+ is programmed to shutdown for a problem with the oil pressure sensor, then it is not necessary to press the alarm codes key in order to view the CID FMI. P004 is equal to 1 for a shutdown fault. The CID and the FMI are automatically displayed on the upper display panel of the EMCP II+.
The possible causes of a CID 0100 FMI 02 diagnostic code are listed below:
- The base signal of the sensor is beyond accepted limits.
- The duty cycle of the sensor signal is beyond accepted limits.
Begin performing these procedures only when CID 0100 FMI 02 is showing and the "DIAG" indicator is FLASHING on the upper display. The flashing indicator means that the fault is active. The GSC+ treats a CID 0100 FMI 02 as an alarm fault. Active alarm faults are shown on the display when the "Alarm Codes" key is pressed and the engine control switch (ECS) is in any position except the OFF/RESET position. For an inactive diagnostic code, the problem may be intermittent. Use Illustration 1, and see Testing And Adjusting, "Electrical Connector - Inspect" in order to troubleshoot a diagnostic code. Clear the diagnostic code from the fault log after troubleshooting is complete.
Note: The operator may choose to troubleshoot the sensor signal with a meter that is capable of measuring frequency instead of performing this procedure. The meter must also measure a duty cycle.
Note: If a CID 0269 for the sensor supply is active, correct the diagnostic code before performing this procedure.
Test Step 1. CHECK THE GSC+ AND THE HARNESS.
- Make sure that CID 0100 FMI 02 is showing on the display.
- Turn the ECS to the OFF/RESET.
- Disconnect the sensor from the engine harness. The sensor remains fastened to the engine.
- Turn the ECS to the STOP position.
- Press the "Alarm Codes" key. The "Alarm Codes" key does not need to be pressed for a shutdown fault.
- Monitor the display. Check whether the CID 0100 FMI 02 is showing on the display. If CID 0100 FMI 02 is not showing, then CID 0100 FMI 02 is inactive. Now, the CID 0100 FMI 03 should be showing. CID 0100 FMI 03 is active.
Expected Result:
CID 0100 FMI 02 is not showing and CID 0100 FMI 03 is showing.
Results:
- OK - CID 0100 FMI 02 is not showing and CID 0100 FMI 03 is showing.
Repair: The GSC+ and the harness function properly. Therefore, the sensor has failed. Replace the sensor. See Testing And Adjusting, "Pulse Width Modulated (PWM) Sensor - Test" for more information.
Stop.
- NOT OK - The CID 100 FMI 02 is still showing. The harness or the GSC+ has failed. Proceed to Test Step 2.
Test Step 2. CHECK THE GSC+.
- Turn the ECS to the OFF/RESET position.
- Disconnect the harness connector from the GSC+. Turn the GSC+ to the STOP position.
- Press the "Alarm Codes" key.
- Check if the CID 0100 FMI 02 is not showing. This means that the CID 0100 FMI 02 is inactive. CID 0100 FMI 03 is now showing. CID 0100 FMI 03 is now active.
Expected Result:
CID 0100 FMI 02 is not showing. The CID 0100 FMI 03 is now showing.
Results:
- OK - CID 0100 FMI 02 is not showing. The CID 0100 FMI 03 is now showing.
Repair: The GSC+ functions properly. Troubleshoot the signal wire in the harness. The harness is located between the sensor connector and the GSC+ connector. See Testing And Adjusting, "Electrical Connector - Inspect" for procedures on checking the electrical connectors and terminals.
Stop.
- NOT OK - CID 0100 FMI 02 is still showing.
Repair: The GSC+ may have failed. It is unlikely that the GSC+ has failed. Exit this procedure and perform this entire procedure again. If the problem remains, replace the GSC+. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
Stop.