ENGINE AR 1344138 - Caterpillar

Illustration 1 g00544121
Schematic for the alarm (action)This diagnostic code is recorded when the main display module reads the voltage of the circuit for the action alarm as above 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.Expected Result:The CID 0271 FMI 06 remains present.Results:
OK - The diagnostic code remains present. The action alarm is not causing the diagnostic code. Proceed to test step 2.
NOT OK - The diagnostic code is NO longer present. The correct resistance for a good alarm is 200 100 ohms. The alarm has failed.Repair: Replace the action alarm. Stop.Test Step 2. CHECK THE HARNESS.
Turn the disconnect switch to the OFF position.
The alarm remains disconnected from the machine harness.
Disconnect the machine harness from the main display module.
At the machine harness connector for the main display module, measure the resistance between contact 4 (410-WH) and frame ground.Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. The harness resistance is correct. Proceed to test step 3.
NOT OK - The resistance is less than 5000 ohms. The harness has failed.Repair: Repair the machine harness or replace the machine harness. Stop.Test Step 3. CHECK THE MODULE.
Remove contact 4 from the machine harness connector for the main display module by using the correct service tools.
Reconnect the machine harness connector to the module.
Turn the disconnect switch and the key start switch to the ON position.
Place the same diagnostic code on hold and check the service code indicator.Expected Result:The CID 0271 FMI 06 is present.Results:
OK - The CID 0271 FMI 06 remains present. The main display module has failed.Repair: It is unlikely that the module has failed. Exit this procedure and perform this diagnostic code procedure again. If the problem has not been found, then replace the main display module. See Testing and Adjusting, "Module - Replace". Stop.
NOT OK - The diagnostic code is NO longer active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. Stop.