MOTOR & MTG GP-TRAVEL 1077028 - Caterpillar

Illustration 1 g00609101
Schematic of the Parking Brake Solenoid
This diagnostic code is for the Parking Brake Solenoid.This diagnostic code is recorded when the current of the solenoid circuit is above normal. The parking brake solenoid will fail to engage the brakes. The fuse for the power train ECM will be open when the parking brake switch is in the ON position. Note: Ensure that CID 0681 FMI 06 is on hold and that the diagnostic code indicator shows "SERV CODE". This procedure can cause new diagnostic codes to be recorded. Ignore these created problems. When the procedure is completed, clear the created problems. Note: The following procedures should be performed while the engine is OFF in order to ensure that the machine will not move with the parking brake switch in the OFF position. Test Step 1. CHECK THE SOLENOID.
Place the parking brake switch in the OFF position.
Turn the key start switch to the ON position. Ensure that CID 0681 FMI 06 is on hold.
Observe the status of the diagnostic code indicator.
Disconnect the machine harness from the parking brake solenoid. Expected Result:"SERV CODE" is NOT showing when the solenoid is disconnected.Results:
YES - "SERV CODE" is NOT showing when the solenoid is disconnected.Repair: The circuit is correct. The solenoid has failed. Repeat this step in order to verify that the solenoid has failed. Replace the solenoid.STOP
NO - "SERV CODE" is showing when the solenoid is disconnected. Proceed to Test Step 2.Test Step 2. CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND.
Turn the key start switch to the OFF position.
The machine harness remains disconnected from the parking brake solenoid.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At machine harness connector J1, measure the resistance from contact J2-1 (solenoid signal) to all possible sources of ground. The possible ground sources are contact J1-2, contact J1-5, contact J1-7, contact J1-15, contact J1-16, contact J2-3 and frame ground. Expected Result:Each resistance should be greater than 5000 ohms.Results:
OK - Each resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - Each resistance is not greater than 5000 ohms.Repair: There is a short in the machine harness. The short is between J2-1 (wire G730-PK(Pink)) and the circuit that has a low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Remove connectors J1 and J2 from the ECM. Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the key start switch to the ON position.
Enter service mode of the Caterpillar Monitoring System and clear all inactive diagnostic codes.
Operate the machine.
Stop the machine and place the parking brake switch in the OFF position.
Determine if CID 0681 FMI 06 is present. Expected Result:CID 0681 FMI 06 is present. "SERV CODE" is showing.Results:
YES - CID 0681 FMI 06 is present. "SERV CODE" is showing.Repair: Exit this procedure and perform the diagnostic code procedure again. If the problem