SEAL 3285492 - Caterpillar

Conditions Which Generate This Code:
Illustration 1 g00519201
System Schematic For Unexpected ShutdownThe purpose of the CID 0566 is to alert the operator that the GSC+ did not control the engine shutdown. The GSC+ normally controls all engine shutdown functions, for both normal operation and fault shutdowns. If an outside influence causes an engine shutdown, the GSC+ declares a CID 0566. There is only one failure mode for a CID 0566 and it is FMI 07. FMI 07 is an improper mechanical response.This diagnostic code causes the following sequence of events:
On a running engine, the GSC+ detects that engine speed has dropped from rated to 0 rpm when the GSC+ has not called for a shutdown.
The GSC+ determines that no engine speed sensor fault is present that explains the drop in speed signal.
The GSC+ declares a CID 0566 FMI 07 and disables the engine from running or starting.Note: An unexpected shutdown fault (CID 0566) will initiate a circuit breaker shunt trip signal.Note: Diagnostic codes are created when the harness connector (40 contact) is disconnected from the GSC+ during these troubleshooting procedures. Clear these created diagnostic codes after the particular diagnostic codes is corrected and cleared. The possible cause of a CID 0566 FMI 07 is a component that is not under the control of the GSC+ has caused an engine shutdown.The GSC+ treats a CID 0566 FMI 07 as a shutdown fault. Clear the diagnostic code from the fault log after troubleshooting is complete.Note: This procedure requires many voltage measurements during simulated engine cranking. Starting motor fuse F4 on the relay module is removed to prevent activating the starting motor and actual engine cranking does not occur. Voltage measurements must be made quickly before the total cycle crank time (setpoint P017) elapses. The total cycle crank time is usually 90 seconds. See Systems Operation, "Engine/Generator Programming OP5-0". If a voltage measurement takes more than 90 seconds the GSC+ declares an overcrank fault and the overcrank shutdown indicator will FLASH. In order to continue with a voltage measurement, the overcrank fault must be reset by turning the ECS to OFF/RESET and then turn the ECS to START.Test Step 1. PERFORM AN INITIAL CHECK.
Make sure that there are NO OTHER ACTIVE DIAGNOSTIC CODES. This means that there are no diagnostic codes which are showing on the upper display. This means that no shutdown or alarm indicators are flashing. Failure to make sure that there are NO OTHER ACTIVE DIAGNOSTIC CODES may result in erroneous troubleshooting and needless replacement of parts. The operator will make many voltage measurements while the GSC+ is attempting to crank the engine. If the GSC+ detects other faults, the GSC+ will prevent starting by shutting off the fuel and air to the engine. The resulting voltage measurements would then be the exact opposite of the voltage which is expected in the procedures.
Check the fuel level and quality.
Check for a plugged fuel filter.
Check for a plugged air filter.
Refer to the Service Manual for the engine if there is an obvious