GEAR-RING 5505497 - Caterpillar

Operation Description:Fault shutdown indicator on the GSC flashes at the rate of four to five times per second (4 to 5 Hz). The displays of the GSC may not be responding. The GSC does not respond to any position of the engine control switch (ECS).This is an internal fault of the GSC that can be temporary or permanent. The fault is caused by a component failure in the GSC. Also, the fault may be caused by severe electromagnetic fields or radio frequency interference. The relays in the relay module are automatically turned off when this fault occurs. The effect of this fault on the engine depends on the type of fuel system.Test Step 1. RESET THE GSC
Turn the ECS to OFF/RESET. If the GSC does not power down, remove the jumper that connects terminals 6 and 9 on the ECS.
Turn the ECS to STOP.Expected Result:The GSC should power up with a normal display and the GSC should respond to the ECS.Results:
OK - The GSC is operating normally. Stop.
NOT OK - The GSC does NOT operate correctly and the fault shutdown indicator still flashes at the rate of four to five times per second (4 to 5 Hz).Repair: The GSC has failed. Replace the GSC. See Testing And Adjusting, "EMCP Electronic Control (Generator Set ) - Replace". Stop.