VALVE GP-CHECK 1400685 - Caterpillar

Thoroughly inspect connectors (1) and (2). Also inspect the connector for the auxiliary temperature sensor. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 4 g01102095
ECM P1 connector (P1-4) +8 V Supply (P1-5) Return (P1-68) Auxiliary temperature sensor signal
Illustration 5 g01102110
J61 and P61 connectors (8) +8 V supply (9) Return (11) Auxiliary temperature sensor signal
Perform a 45 N (10 lb) pull test on each of the wires that is associated with the auxiliary temperature sensor circuit.
Check the torque of the allen head screws for the ECM connectors and the customer connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 3.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the connector seals are in place. Verify that the repair eliminates the problem.Verify that the repair eliminates the problem.STOPTest Step 3. Check the Sensor Supply Voltage at the Sensor Connector
Disconnect the auxiliary temperature sensor.
Turn the keyswitch to the ON position.
Use a multimeter to measure the voltage between terminal A (+8 V digital supply) and terminal B (sensor return) at the harness connector for the auxiliary temperature sensor.
Turn the keyswitch to the OFF position.Expected Result:The digital sensor supply voltage between terminal A (+8 V digital supply) and terminal B (sensor return) is 8.0 0.4 VDC.Results:
OK - The supply voltage is reaching the sensor. Proceed to Test Step 4.
Not OK - The digital sensor supply voltage is not reaching the sensor.Repair: Refer to the diagnostic functional test Troubleshooting, "Digital Sensor Supply Circuit - Test" for the appropriate troubleshooting procedure.STOPTest Step 4. Check for Active Diagnostic Codes
Connect the Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 15 seconds in order for the diagnostic codes to become active.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A 1836-08 diagnostic code is active. Proceed to Test Step 5.Test Step 5. Check for a Short in the Signal Wire
Disconnect the following connectors.
P142/J142 (auxiliary temperature sensor)
J1/P1 (ECM connectors)
J2/P2 (ECM connectors)
Measure the resistance between the suspect sensor's signal wire and every terminal on the P1 and P2 connectors.Wiggle the harness during each measurement in order to locate any opens or shorts in the harness.
Measure the resistance between the sensor's signal wire and the engine ground stud.Expected Result:Each check of the resistance indicates an open circuit.Results:
OK - Each check of the resistance indicates an open circuit. The signal wire is not shorted to another wire that is in the