FAN DRIVE GROUP 4N3138 - Caterpillar

Operation Description:The engine does not shut down when a shutdown fault occurs.Note: It is critical that GSC setpoint 023 is correct for the engine application. Ensure that setpoint 023 is programmed correctly for the engine application before continuing with this procedure. There are several possible causes when a shutdown fault occurs and an engine does not shut down:
Operator Error: The operating conditions of the generator may not be understood by the operator. Ensure that the condition is one that should cause an engine shutdown.
The Fault Is Overridden Or The Fault Is Disabled.: It is possible to program the GSC in order to override certain shutdown faults. An overridden shutdown fault will be treated as an alarm fault. The YELLOW fault alarm indicator will be FLASHING instead of the RED fault shutdown indicator. If the GSC is programmed in order to disable a particular fault, there will not be any fault indicators. Check the setpoints. It is also possible to program the engine ECM to override certain shutdown faults. See Troubleshooting, RENR2227, "3406E and 3456 EPG Engines" for more information on programming the engine ECM.
The Setpoints Are Incorrect For The Application. : It is possible to program the GSC setpoints to a value that does not allow the situation to be recognized by the GSC as a shutdown condition. In this case, check the appropriate setpoints for correct values.
Faulty Component The following problems prevent the engine stopping procedure.engine ECM, GSC and a broken harness wire or a shorted harness wire. The controller will be shutting down the engine. Test Step 1. CHECK FOR DIAGNOSTIC CODES
Check the GSC for a diagnostic code on the upper display.Expected Result:The GSC should show a diagnostic code on the upper display.Results:
YES - The GSC shows a diagnostic code on the upper display.Repair: See theTesting and Adjusting section of this book for the diagnostic code that is displayed on the GSC. Stop.
NO - The GSC does NOT show a diagnostic code on the upper display. Proceed to Test Step 2.Test Step 2. CHECK THE YELLOW FAULT ALARM INDICATOR
Check the display of the GSC for the yellow fault alarm indicator.Expected Result:The yellow fault alarm indicator is ON CONTINUOUSLY.Results:
YES - The yellow fault alarm indicator is ON CONTINUOUSLY. The GSC has been programmed to override the normal shutdown response. The setpoints have been modified and the GSC treats the condition as an alarm fault. The engine will continue to run.Repair: In order to view the setpoints, seeSystems Operation, "Engine/Generator Setpoint Viewing OP2". In order to reprogram the setpoints, see Systems Operation, "Engine/Generator Programming OP5". Stop.
NO - The yellow fault alarm indicator is not illuminated at all. Proceed to Test Step 3.Test Step 3. CHECK FOR THE RED FAULT SHUTDOWN INDICATOR
Check the display area of the GSC for the red fault shutdown indicator.Expected Result:The red fault shutdown should be FLASHING.Results:
YES - The red fault shutdown indicator is FLASHING and the engine remains running. Proceed to Test Step 4.
NO - All fault indicators are