PANEL 0992831 - Caterpillar

Illustration 1 g00897468
Schematic of Tong Pressure Sensor (1) Tong pressure sensor. (2) Power train electronic control module (ECM).The CID 0455 FMI 00 service code is recorded when power train electronic control module (ECM) (2) reads the sensor signal as above normal.Note: The following procedures can create other faults that the ECM will detect. Ignore these faults and clear these faults when this fault is corrected.
Check the sensor.
Turn the disconnect switch and the key start switch to the ON position.
Access Service Mode. Place CID 0455 FMI 00 on hold. Ensure that the fault present indicator shows "SERV CODE". Refer to Systems Operation, Troubleshooting, Testing and Adjusting, SENR1394, "Caterpillar Monitoring System" for more information on accessing the service mode.
Disconnect the machine harness from pressure sensor (1) while you are observing the fault present indicator or the action alarm.Expected Result: If the sensor is not the cause of the fault, "SERV CODE" remains ON. If the sensor is faulty, "SERV CODE" goes OFF.Results:
OK - ("SERV CODE" remains ON) - Tong pressure sensor (1) is not faulty. The machine harness or the ECM may be faulty. Proceed to Step 2.
NOT OK - ("SERV CODE" goes OFF) - The machine harness and the ECM are operating properly. Tong pressure sensor (1) is faulty. Replace the sensor. STOP.
Check the harness ground circuit.Tong pressure sensor (1) remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from power train electronic control module (ECM) (2) .
At the machine harness connector for the sensor, measure the resistance from wire 229-BK (ground) to frame ground.Expected Result: The resistance should be less than 2 Ohms.Results:
OK - The resistance is less than 2 Ohms. The resistance in the harness is correct. Proceed to Step 3.
NOT OK - The resistance is greater than 2 Ohms. The ground circuit in the harness is incorrect. There is an open between wire 229-BK and frame ground. Repair the machine harness or replace the machine harness. STOP.
Check for shorted harness.Tong pressure sensor (1) remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from power train electronic control module (ECM) (2) .
At the machine harness connector for the sensor, measure the resistance from wire 164-WH (positive battery) to wire E852-YL (signal).Expected Result: The resistance should be greater than 5000 Ohms.Results:
OK - The resistance is greater than 5000 Ohms. The resistance in the harness is correct. Proceed to Step 4.
NOT OK - The resistance is less than 5000 Ohms. The machine harness is faulty. There is a short between wire 164-WH and wire E852-YL. Repair the machine harness or replace the machine harness. STOP.
Check for an open in the harness.Tong pressure sensor (1) remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from power train electronic control module (ECM) (2) .
At the machine harness connector for the sensor, measure the