COOLING GP 5587629 - Caterpillar

will result in a CID566 diagnostic code on the GSC+. The GSC+ controls all engine shutdowns for both normal operation and for fault shutdowns. If an outside influence causes an engine shutdown, the GSC+ shows a CID 0566. There is only one failure mode for a CID 0566. This failure mode is FMI 07. FMI 07 is an improper mechanical response.The diagnostic code causes the following sequence of events:
The GSC+ detects a drop in engine speed from the rated speed to 0 rpm. The GSC+ has not called for a shutdown.
The GSC+ determines that the drop in speed signal did not generate an engine speed sensor fault.
The GSC+ generates a CID 0566 FMI 07. The GSC+ will then disable the engine from running or starting.The possible cause of a CID 0566 FMI 07 is listed below.
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 fault from the fault log after troubleshooting is complete.Note: This procedure requires many voltage measurements during simulated engine cranking. Remove the fuse "F4" in order to prevent activation of the starting motor and actual engine cranking. The fuse "F4" is located on the relay module. Voltage measurements must be made quickly before the total cycle crank time (setpoint P017) elapses. The total cycle crank time is 90 seconds. See Systems Operation, "Engine/Generator Programming OP5-0". If taking a voltage measurement is longer than 90 seconds the GSC+ will generate an overcrank fault. The overcrank shutdown indicator will FLASH. In order to continue with a voltage measurement, the overcrank fault must be reset by turning the engine control switch (ECS) to OFF/RESET. Then, turn the ECS to START.Test Step 1. PERFORM AN INITIAL CHECK FOR OTHER ACTIVE DIAGNOSTIC CODES.Note: 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.Expected Result: The previous checks are OK.Results:
OK - No problem was found after the previous checks were made. Proceed to test step 2 .
NOT OK - One or more problems are found after the previous checks are made.Repair: Refer to the Service Manual for the engine if there is an obvious fault with the engine or the fuel system. Stop.Test Step 2. CHECK THE SYSTEM VOLTAGE.
With the engine