COVER 6B4128 - Caterpillar

Illustration 5 g02745705
Terminal locations at the P1 ECM connector for the oil level sensor (P1-4) 8 V supply (P1-5) Return (P1-35) Engine oil level
Illustration 6 g01159881
Terminal locations at the harness connector for the oil level sensor (Terminal A) 8 V supply (Terminal B) Return (Terminal C) Sensor signal
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the oil level sensor.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The harnesses and the wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or the wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Supply Voltage at the Sensor Connector
Disconnect the oil level sensor at the sensor connector.
Restore electrical power to the ECM.
Measure the voltage between terminals A (supply) and B (return) at the harness connector for the oil level sensor.
Remove electrical power from the ECM.Expected Result:The voltage measurement is 8.0 0.4 VDC.Results:
OK - The voltage measurement is 8.0 0.4 VDC. The supply voltage is reaching the sensor. Proceed to Test Step 3.
Not OK - The voltage measurement is not 8.0 0.4 VDC.Repair: The sensor supply voltage is not reaching the sensor. There is a problem in the circuit for the digital sensor supply. Refer to Troubleshooting, "Sensor Supply - Test".STOPTest Step 3. Short the Signal Wire to Ground and Monitor the Status for "Engine Off Oil Level"
Remove electrical power from the ECM.
Fabricate a jumper wire that is long enough to create a short circuit between two terminals at the oil level sensor harness connector. Crimp connector pins to each end of the jumper wire.
Install the jumper wire between terminals B (return) and C (signal) on the harness side of the connector for the oil level sensor.
Restore electrical power to the ECM.
Monitor Cat ET while the jumper wire is installed. Check