COVER 1W2076 - Caterpillar

Illustration 1 g00564313
Schematic For The Pressure Sensor (Engine Oil)Illustration 1 is applicable to the following engines: 3500 MUI engine, the 3412 MUI engine and the 3412 PEEC engine. Note: Ensure that the desired diagnostic code (CID FMI) is on hold. Ensure that the "SERV CODE" indicator is ON. To find the connector contact on the Main Display Module that corresponds to the current CID that is shown, the operator should use the wiring diagram for the engine that is being serviced.The diagnostic code is recorded when the Main Display Module reads an abnormal sensor signal. The sensor signal is not identifiable to the input circuitry of the main display module. This diagnostic code will make the corresponding Alert indicator flash and the Gauge Needle will move to the warning region. The following examples are possible causes.
The engine oil pressure sensor has a problem.
The ground circuit of the engine oil pressure sensor for the engine harness is open.
The signal circuit of the engine oil pressure sensor for the engine harness is shorted to +Battery.
The signal circuit of the engine oil pressure sensor for the engine harness is open or the connector is disconnected.
The Main Display Module has a problem.
Check The Display Area And The Harness.
Turn the "ECS" switch to the OFF/RESET position.
Check for loose terminal connections or corroded terminal connections.
Clean corroded terminals and tighten loose connections.
Turn the "ECS" to the COOLDOWN/STOP position. The "SERV CODE" indicator should be ON for CID 0100 FMI 08.
Measure The Voltage Of The Supply Wire For The Engine Oil Pressure Sensor.
Turn the "ECS" switch to the COOLDOWN/STOP position.
Use the 7X-1710 Multimeter Probe to measure the voltage from the ground wire of the oil pressure sensor (pin B) to the supply wire (pin A).The Expected Result - The voltage should be 8.0 DCV ( 0.5 DCV).Results:
OK: The voltage is 8.0 0.5 DCV. The voltage is correct. Proceed to Step 3.
Not OK: The voltage is less than 8.0 0.5 DCV. The harness wiring has a problem. There is an open circuit, a short to ground in the supply wire of the engine oil pressure sensor, or a poor connection. Repair the harness or replace the harness. If the cause of the diagnostic code is not found, proceed to Step 3.
Measure The Signal Voltage Of The Engine Oil Pressure Sensor.
Turn the "ECS" to the COOLDOWN/STOP position.
Use the 7X-1710 Multimeter Probe to measure the voltage from the ground wire of the engine oil pressure sensor (pin B) to the supply wire (pin C).Expected Result: The voltage should be between 1.0 DCV and 7.0 DCV.Results:
OK: The voltage is between 1.0 DCV and 7.0 DCV. The signal voltage at the sensor is correct. Proceed to Step 4.
Not OK: The voltage is NOT between 1.0 DCV and 7.0 DCV. The signal voltage at the sensor is not correct. If the voltage is greater than 7.0 DCV, proceed to Step 5. If the voltage is less than 1.0 DCV, proceed to Step 6.
Measure The Signal Voltage Of The Engine Oil Pressure