ELBOW 4N5878 - Caterpillar

Conditions Which Generate This Code:
Illustration 1 g00527056
System Schematic For Engine Oil Pressure SensorThis 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 0100 FMI 03. P004 is equal to 1 for a shutdown fault. The CID 0100 FMI 03 is automatically shown on the upper display.The possible causes of a CID 0100 FMI 03 are listed below:
The sensor signal is shorted to +battery.
The sensor signal is open.Begin performing these procedures only when CID 0100 FMI 03 is showing and the "DIAG" indicator is FLASHING on the upper display. The diagnostic code is active. The GSC+ treats a CID 0100 FMI 03 as an alarm fault. Active alarm faults are shown on the display when the "Alarm Codes" key is pressed. The engine control switch (ECS) must NOT be in the OFF/RESET position. For an inactive diagnostic code, the problem may be intermittent. Use Illustration 1 in order to troubleshoot an inactive diagnostic code. Also see Testing And Adjusting, "Electrical Connector - Inspect". Clear the diagnostic code from the fault log after troubleshooting is complete.Note: If a CID 0269 for the sensor supply is active, correct the diagnostic code before performing this procedure.Test Step 1. CHECK THE SUPPLY CIRCUIT.
Turn the ECS to the OFF/RESET position and then turn the ECS to the STOP position.
Disconnect the sensor from the engine harness. The sensor remains fastened to the engine.
At the engine harness side of the connector, measure the DC voltage that is between contact "A" and contact "B". Contact "A" is the supply. Contact "B" is the sensor ground.Expected Result:The voltage should be 8.0 0.5 DCV.Results:
OK - The voltage is 8.0 0.5 DCV. The sensor voltage supply circuit functions properly. Proceed to Test Step 2.
NOT OK - The voltage is not 8.0 0.5 DCV. The sensor voltage supply circuit has failed or the engine harness has an open circuit. Proceed to Test Step 5.Test Step 2. CHECK