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| Illustration 1 | g01439320 |
System Schematic For The Engine Control Module | |
The purpose of the CID 0566 is to alert the operator that the GSC+P did not control the engine shutdown. A shutdown fault initiated solely by the Engine Control Module (ECM) will result in a CID 566 diagnostic code appearing on the GSC+P. The GSC+P normally controls the engine shutdown for both normal operation and fault shutdowns. If an outside influence causes an engine shutdown, the GSC+P 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:
- On an engine that is running, the GSC+P will detect if the engine's Revolutions Per Minute (RPM) drops to 0 rpm without the GSC+P initiating an engine shutdown.
- The GSC+P determines that no engine speed sensor fault is present that explains the drop in speed signal.
- The GSC+P declares a CID 0566 FMI 07 and disables 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+P has caused an engine shutdown.
The GSC+P 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. F4 is the fuse for starting the engine. F4 is located on the Relay Module (RM). F4 is removed in order to prevent cranking the engine and starting the engine. Voltage measurements must be made quickly before the total cycle crank time (setpoint P017) elapses. The total cycle crank time is ninety seconds. Refer to Systems Operation, "Engine/Generator Programming OP5-0". If the voltage measurement takes more than ninety seconds, the GSC+P 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.
- Make sure that there are NO OTHER ACTIVE FAULTS. 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 do so may result in erroneous troubleshooting and needless replacement of parts. The operator will make many voltage measurements while the GSC+P is attempting to crank the engine. If the GSC+P detects other faults, it 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 fault with the engine or the fuel system.
- Check the operation of the air shutoff solenoid (if present).
Expected Result:
The air shutoff solenoid activates and the air shutoff solenoid deactivates.
Note: If there is no air shutoff solenoid present, proceed with the "YES" statement.
Results:
- YES - The air shutoff solenoid can be activated and the air shutoff solenoid can be deactivated. Proceed to Test Step 2.
- NO - The air shutoff solenoid can NOT be activated and the air shutoff solenoid can NOT be deactivated. STOP
Test Step 2. VERIFY THE DIAGNOSTIC CODE.
- Check if the CID 0566 FMI 07 is showing. This means that the CID 0566 FMI 07 is active.
Expected Result:
The CID 0566 FMI 07 is showing as an active fault.
Results:
- OK - Only a CID 0566 FMI 07 is showing.STOP
- NOT OK - A CID 0566 FMI 07 is NOT showing. No active CID 0566 FMI 07 exists. STOP
Test Step 3. CHECK THE SYSTEM VOLTAGE.
- With the engine off, measure the system voltage at the battery. Make a note of this measurement. This measurement of the system voltage is used for comparison in future steps of this procedure.
Expected Result:
For a 24 volt system, the system voltage should be from 24.8 to 29.5 DCV. For a 32 volt system, the system voltage should be from 33.1 to 39.3 DCV.
Results:
- OK - The system voltage is correct.STOP
- NOT OK - System voltage is NOT correct.
Repair: For troubleshooting, refer to Testing And Adjusting, "CID 168 Electrical System".
STOP