PIN 4V2723 - Caterpillar

Illustration 1 g02754936
Schematic of the Action Alarm for the 583T, 587T, PL83, and PL87 models.
Illustration 2 g02800718
Schematic of the Action Alarm for the 572RII.This diagnostic code is recorded when the ECM reads the voltage of the circuit for the action alarm as above normal. The result of this diagnostic code is the continuous sounding of the action alarm. The schematic that is shown above represents a typical installation of the component. Verify the connector contact and wire numbers by using the Electrical System Schematic for the machine that is being serviced. Test Step 1. CHECK THE ALARM CIRCUIT.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness from the ECM.
Turn the disconnect switch to the ON position.
Listen for the SOUNDING of the action alarm.
Turn the key start switch to the ON position.Expected Result: The alarm is sounding.Results:
YES - The alarm is SOUNDING. The harness circuit 410-WH is shorted to the +battery.Repair: Repair the harness or replace the harness.STOP
NO - The alarm does NOT SOUND. The ECM has failed.Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. If the cause of the diagnostic code is not found, replace the ECM. See Troubleshooting, "Main Display Module - Replace".STOP