ALTERNATOR GP-CHARGING 1264311 - Caterpillar

Illustration 1 g01035973
Schematic of the switch circuit for the interlock override and hydraulic lockoutThis diagnostic code is associated with the switch for interlock override. The FMI 04 means that the ECM determined that the voltage is below normal. The circuit is possibly shorted to ground.Test Step 1. CHECK THE CONTINUITY OF THE SWITCH
Remove the switch from the headliner.
Unplug the switch from the wire harness.
With the switch in the center position, check the resistance from terminal 6 to terminal 5.Expected Result:The resistance should be greater than 5000 Ohms.Results:
OK - The resistance is greater than 5000 Ohms. Proceed to Test Step 2.
NOT OK - The resistance was less than 5000 Ohms.Repair: The switch has failed. Replace the switch. Stop.Test Step 2. CHECK THE SWITCH CIRCUIT
Remove the floorplate in order to get to the ECM.
Remove the wire harness from the ECM.
Measure the resistance from contact 6 to contact 64 of the wiring harness connector.Expected Result:The resistance should be greater than 5000 Ohms.Results:
OK - The resistance is greater than 5000 Ohms.Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NOT OK - The resistance was less than 5000 Ohms.Repair: The circuit is shorted to ground in the wire harness. Locate the short. Repair the wire harness or replace the wire harness. Stop.