EDGE-CUTTING 2741360 - Caterpillar

Illustration 1 g03330938
Action alarm Schematic A CID 0271 is associated with the action alarm. An FMI 05 means that the Messenger module has determined that the current of the alarm circuit is below normal.The possible causes of this diagnostic code are listed below:
Open alarm energize circuit.
Open alarm return circuit.
The alarm has failed.
Failed Instrument cluster, but is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0271 FMI 05 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE ALARM.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the alarm with the active diagnostic code from the machine harness for the dash cluster.
At the machine harness connector for the alarm, place a jumper wire from the positive contact (wire 410-WH) to the negative contact (wire 210-BK).
Observe the status of the CID 0271 FMI 05.Expected Result:The CID 0271 FMI 05 diagnostic code remains active.Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The alarm has failed.Repair: The alarm has failed. Repeat this Test Step "CHECK THE ALARM" in order to verify the failure of the alarm. Replace the alarm. Verify that the new alarm corrects the problem.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the dash cluster.
The jumper wire that was installed in the previous test remains in place.
At the machine harness connector for the dash cluster, measure the resistance from contact 23 (wire 410-WH) to contact 2 (wire 210-BK).Expected Result:The resistance is less than 5.0 ohms.Results:
YES - The resistance is less than 5.0 ohms. The machine harness for the dash cluster is correct. Proceed to Test Step 3.
NO - The resistance is greater than 5 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness for the dash cluster.Repair: The open is in wire 410-WH or in wire 210-BK of the machine harness for the dash cluster. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK HARNESS CONNECTORS
Inspect the contacts of the harness connectors and clean the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 0271 FMI 05 diagnostic code.Expected Result:The CID 0271 FMI 05 diagnostic code is active.Results:
YES - The CID 0271 FMI 05 diagnostic code is active. The diagnostic code has not been corrected. The dash cluster may have failed.Repair: Is unlikely that the Instrument cluster has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the Instrument cluster.