SEAL-O-RING 2M0879 - Caterpillar

System Operation Description:The engine does not shut down when a shutdown fault occurs.
Illustration 1 g00794050
System Schematic For Electronic Control Relay
Illustration 2 g00794058
System Schematic For Engine Control Switch (ECS)Note: It is critical that GSC+ setpoint P023 is correct for the engine application. Ensure that setpoint P023 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.
Programming Error-Fault Is Overridden Or 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 or codes shown on the GSC+. In these cases, it is a good idea to check any setpoints related to that fault. For example, if a genset is not shutting down when an overvoltage fault occurs, make sure setpoint P104 (Overvoltage shutdown enable) is programmed correctly. It is also possible to program the engine ECM in order to override certain shutdown faults or in order to ignore certain shutdown faults. See Troubleshooting, RENR2227, "3406E and 3456 Generator Set Engines" for more information on programming the engine ECM.
Programming Error - Setpoints Incorrect For Application Or Customer Needs: 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. For example, if the genset is not shutting down when a high coolant temperature condition occurs, make sure setpoint P015 (High Water Temperature Shutdown) is correct for the application.
Faulty Component: Some examples of faulty components that could prevent the GSC+ from shutting down the engine are: engine ECM, GSC+ and a broken or shorted harness wire. In this case, the GSC+ or engine ECM will be issuing a command to shut down the engine due to a diagnostic code, but the engine remains running. 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