TUBE AS 5087844 - Caterpillar

fault indicator on the GSC+ flashes four to five times per second (4 to 5 Hz). The displays of the GSC+ may be unclear. 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+. The fault could also be caused by extremely severe electromagnetic interference 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.
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 an identifiable display. The GSC+ should respond to the ECS. Results:
OK: The GSC+ operates correctly. Therefore, the fault is gone. STOP.
NOT OK: The GSC+ does NOT operate correctly and the fault shutdown indicator still flashes at a rate of four to five times a second (4 to 5 Hz). Therefore, the GSC+ is faulty. Replace the GSC+. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". STOP.