TOOTH GP-RIPPER 3G2089 - Caterpillar

Illustration 1 g02798560
Schematic of the parking brake switch (pull-to-engage)Note: Push-to-engage parking is configurable using Caterpillar Electronic Technician (ET).Note: The following test procedure is applicable to the pull-to-engage parking brake switch and the push-to-engage parking brake switch.This diagnostic code is associated with the parking brake switch. The switch is connected to two inputs of the Power Train Electronic Control Module (ECM). One contact is open and the other contact is grounded during proper operation.FMI 03 means that the Power Train ECM has determined that the normally open contact and the normally closed contact are open.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0070 FMI 03 is active before performing this procedure.System Response:The parking brake remains engaged when a failure exists for this diagnostic code.Test Step 1. CHECK THE CIRCUIT FOR AN OPEN CIRCUIT
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connector from the parking brake switch.
Disconnect the machine harness connector from the Power Train ECM.
At the machine harness connector for the switch, place a jumper wire from connector contact 2 (wire U735-GY) to connector contact 6 (wire U734-GN).
At the harness connector for the Power Train ECM measure the resistance between connector contact J2-54 (wire U735-GY) and connector contact J2-55 (wire U734-GN).Expected Result:The resistance is less than 5 ohms.Results:
YES - The resistance is less than 5 ohms. The harness circuit is correct. Proceed to Test Step 2.
NO - The resistance is greater than 5 ohms. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE GROUND CIRCUIT
The disconnect switch and the key start switch remain in the OFF position.
The harness connectors for the Power Train ECM and the switch remain disconnected.
Remove the jumper wire that was installed in the previous Test Step.
At the harness connector for the switch, measure the resistance from connector contact 3 (wire 202-BK)