PLATE 4V7707 - Caterpillar

Illustration 1 g03741303
Schematic of the parking brake oil pressure sensorThis diagnostic code is associated with the parking brake oil pressure sensor. The sensor is connected to two inputs of the Power Train ECM. One of the inputs is open and the other input is grounded during proper operation.The FMI 04 means that the ECM has determined that the normally open and normally closed circuits are grounded.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0627 FMI 04 is active before performing this procedure.Test Step 1. CHECK THE HARNESS
Turn the battery disconnect switch and key start switch to the OFF position.
Disconnect the machine harness from the sensor.
Disconnect the machine harness connectors from the ECM.
Measure the resistance between contacts J2-53 (wire D735-PK) and J2-52 (wire D756-YL) of the machine harness to all the contacts that are used in machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5 ohms.Results:
YES - Each resistance measurement is greater than 5 ohms. Proceed to Test Step 2.
NO - One or more of the resistance measurements are less than 5 ohms. The harness has failed. The short is between J2-53 (wire D735-PK) and the circuit with the lowest resistance or the short is between J2-52 (wire D756-YL) and the circuit with the lowest resistance.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean the connectors.
Reconnect all harness connectors.
Turn the battery disconnect switch and key start switch to the ON position.
Operate the machine.
Determine if CID 0627 FMI 04 is active.Expected Result:The CID 0627 FMI 04 is active. Results:
YES - The CID 0627 FMI 04 is active. The diagnostic code has not been corrected. The ECM may have failed.Repair: The ECM may have failed, but is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - The CID 0627 FMI 04 is not active. The diagnostic code does not exist at this time. Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors when disconnected and reconnected. Resume normal machine operation.STOP