GEAR-RING 6P8302 - Caterpillar

Illustration 1 g00824088
Schematic for the parking brake pressure switchThis diagnostic code is associated with the parking brake pressure switch. The switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation. This FMI 03 means that the 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.Test Step 1. CHECK THE GROUND CIRCUIT OF THE SWITCH IN THE HARNESS
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector(s) from the ECM.
Measure the resistance between contact J1-16 (wire 962-OR) of the machine harness for the ECM and the contact A (wire 962-OR) .Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.
NOT OK - The resistance is greater than 5000 ohms. The circuit is open. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT
Turn the disconnect switch and the key start switch to the OFF position.
The machine harness remains disconnected from the switch.
Disconnect the machine harness connector(s) from the ECM.
Measure the resistance between contacts J1-27 (wire G764-PK) and J1-36 (wire 419-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 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. Proceed to Test Step 3.
NOT OK - One or more of the resistance measurements are less than 5000 ohms. The harness has failed. The short is between J1-27 (wire G764-PK) and the circuit with the lowest resistance or the short is between J1-36 (wire 419-YL) and the circuit with the lowest resistance.Repair: Repair the wiring harness or replace the wiring harness.STOPTest Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS
The machine harness remains disconnected from the ECM and the switch.
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