PLATE 2772537 - Caterpillar

Illustration 1 g00544121
Schematic for the alarm (action)
This diagnostic code is recorded when the main display module reads the current of the action alarm. The current for the action alarm is below normal. The action alarm does not SOUND as a result of this diagnostic code. 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.
Disconnect the machine harness from the alarm.
At the machine harness connector for the alarm, place a jumper across the two contacts. Expected Result:The CID 0271 FMI 05 is still present.Results:
YES - The CID 0271 FMI 05 remains present. The action alarm is not causing the diagnostic code. Verify that the action alarm is correct. The correct resistance for a good alarm is 200 100 ohms. Proceed to test step 2.
NO - The CID 0271 FMI 05 is NO longer present. The alarm is open.Repair: Replace the action alarm. Verify that the action alarm is open. The correct resistance for a good alarm is 200 100 ohms.STOPTest Step 2. CHECK THE HARNESS.
Turn the disconnect switch and the key start switch to the OFF position.
Remove the jumper from the connector of the alarm and reconnect the alarm to the machine harness.
Disconnect the machine harness from the main display module.
At the machine harness connector for the module, measure the resistance between contact 4 (410-WH(White)) and frame ground. Expected Result:The resistance is greater than 300 ohms.Results:
OK - The resistance is greater than 300 ohms. The harness circuit is open. Proceed to test step 3.
NOT OK - The resistance is less than 300 ohms. The harness circuit resistance is correct. Proceed to test step 4.Test Step 3. CHECK THE HARNESS.
Disconnect the machine harness from the alarm.
Check for an open in the circuit 410-WH(White). Check between the harness connector for the main display module (contact 4) and the harness connector for the action alarm (contact 1).
Check for an open in the circuit 201-BK(Black). Check between the harness connector for the action alarm (contact 2) and the frame ground. Expected Result: The machine harness is correct.Results:
OK - The machine harness is correct. STOP
NOT OK - The machine harness is not correct.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK THE MAIN DISPLAY MODULE.
Reconnect the machine harness connector to the main display module.
Reconnect the alarm to the machine harness.
Turn the disconnect switch and the key start switch to the ON position. Expected Result:The CID 0271 FMI 05 is still present.Results:
YES - The CID 0271 FMI 05 remains present. The main display module has failed.Repair: It is unlikely that the main display module has failed. 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 main display module. See Testing and Adjusting, "Module - Replace".STOP
NO