HOSE-COOLANT 2S6654 - Caterpillar

Illustration 1 g02483877
Schematic of the action alarmThe CID 0271 diagnostic code is associated with the action alarm. The FMI 3 means that the Advisor module has determined that the voltage of the alarm circuit is above normal.The possible causes of the diagnostic code are listed below:
The action alarm has failed.
The energize circuit of the action alarm is shorted to the +battery circuit.
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 diagnostic code of CID 271 FMI 3 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
Disconnect the harness connector from the action alarm.
Use jumpers to connect the respective terminals of the alarm to A+ battery and ground.Expected Result:The action alarm sounds when power is applied.Results:
OK - The action alarm sounds when power is applied. The alarm functions properly. Proceed to Test Step 2.
NOT OK - The action alarm does NOT sound. The alarm has failed.Repair: 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 ENERGIZE CIRCUIT OF THE ALARM FOR A SHORT TO THE +BATTERY CIRCUIT
Turn the key start switch and the disconnect switch to the OFF position.
The machine harness connector remains disconnected from the alarm. Disconnect the machine harness from the display module.
At the machine harness connector for the display module, measure the resistance from contact IC-23 (wire 410-WH) to all contacts that are used in the machine harness connectors for the display module.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness for the display module. The short is between IC-23 (410-WH) and the circuit that has a low resistance measurement.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation. Damage is caused by excessive heat, battery acid, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all of the harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened.
Turn the disconnect switch and the key start switch to the ON position.
Determine if the CID 271 FMI 3 diagnostic code is active.Expected Result:The CID 271 FMI 3 diagnostic code is not active.Results:
OK - The CID 271 FMI 3 diagnostic code is not active. The diagnostic code does not exist at this time.