TUBE AS 2301582 - Caterpillar

Illustration 1 g02633038
Schematic of the action alarmThe CID 0271 diagnostic code is associated with the action alarm. The FMI 05 means that the Display module has determined that the current of the alarm circuit is below normal.The possible causes of this diagnostic code are listed below:
The energize circuit of the alarm is open.
The return circuit of the alarm is open.
The alarm has failed.
The display module has failed. This condition 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 CID 0271 FMI 05 diagnostic code 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 display module.
At the machine harness connector for the alarm, place a jumper wire from the positive contact (wire 410-WH) to the negative contact (wire 201-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NO - The diagnostic is no longer active.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 display module.
The jumper wire that was installed in the previous test remains in place.
At the machine harness connector for the display module, measure the resistance from signal contact IC-23 (wire 410-WH) to contact IC-2 (wire 201-BK).Expected Result:The resistance is less than 5.0 ohms.Results:
OK - The resistance is less than 5.0 ohms. The machine harness for the display module is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness for the display module. The open is in wire 410-WH or in wire 208-BK of the machine harness.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors and clean the contacts of the harness connectors that are in the affected circuit. Check the wires for damage to the insulation that can be caused by excessive heat or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the switch circuit.
Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are fastened.
Turn the disconnect switch and the key start switch to the ON