969868 Volvo.Penta Six point socket scr

Illustration 1 g00479969
System Schematic For Electronic Governor Relay (EGR)
Illustration 2 g00488518
System Schematic For Air Shutoff Relay (ASR)The CID 566 alerts the operator that the GSC+ did not control the engine shutdown. Any fault shutdown that is initiated solely by the engine ECM will result in a CID 566 on the GSC+. If an outside influence causes the engine to shut down, the GSC+ indicates a CID 566. There is only one failure mode for a CID 566 and the mode is FMI 7 (faulty mechanical response).The diagnostic code causes the following sequence of events:
The engine is running.
The engine speed drops to 0 rpm.
The GSC+ detects the drop to 0 rpm.
The GSC+ has not called for a shutdown.
The GSC+ determines that no fault for the engine speed sensor is present.
The GSC+ indicates a CID 566 FMI 7 and the GSC+ disables the engine from running. ProcedureA component which is not controlled by the GSC+ could possibly cause a CID 566 FMI 7. This component would need to have caused an engine shutdown. The GSC+ treats this diagnostic code 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. The fuse for the starting motor "F4" on the relay module is removed in order to prevent the activation of the starting motor. Voltage measurements must be made quickly before the total cycle crank time (setpoint P17) elapses. The total cycle crank time is set to the default. The default time is ninety seconds. See Systems Operation, "Engine/Generator Programming OP5". The time that is required to take a voltage measurement is only 90 seconds. If this time is exceeded, the GSC+ indicates an overvoltage fault. The indicator for the overcrank shutdown will FLASH. In order to continue with a voltage measurement, the overcrank fault must be reset by turning the ECS to OFF/RESET. Then turn the ECS to START.
Perform an initial check. Before you perform the troubleshooting procedures, perform the following steps:
Make sure that there are NO OTHER ACTIVE FAULTS. Erroneous troubleshooting and needless replacement of parts can be caused by a failure to check for other diagnostic codes. The operator will make many voltage measurements while the GSC+ is attempting to crank the engine. The GSC+ detects other diagnostic codes. If the GSC+ detects other diagnostic codes, the GSC+ will prevent the starting of the engine by shutting off the fuel and the air.
Check the fuel level and the fuel quality.
Check for a plugged fuel filter.
Check for a plugged air filter.
Refer to the Engine Service Manual if there is an obvious engine fault. Also, refer to the Engine Service Manual if there is an obvious fault with the fuel system.
Check the air shutoff solenoid for activation. If the air shutoff solenoid is activated and the air shutoff solenoid cannot be deactivated, begin troubleshooting with 15. Otherwise begin troubleshooting with 2.
Verify the diagnostic code.
Observe the upper display. Check that the CID 566 FMI 7 is showing.Expected Result: A CID 566 FMI 7 is showing as an active fault.Results:
OK: Only a CID 566 FMI 7 is showing. Proceed to 3. If an inactive CID 566 FMI 7 is showing in the fault log, check the history of the genset and proceed to 3.
NOT OK: A CID 566 FMI 7 is NOT showing. No active CID 566 FMI 7 exists. STOP.
Check the system voltage.
Ensure that the engine is off. Measure the system voltage at the battery. Make a note of this measurement. The measurement for the system voltage is used for comparison in future steps of this procedure.Expected Result: For 24 volt systems, the system voltage should be from 24.8 to 29.5 DCV. For 32 volt systems, the system voltage should be from 33.1 to 39.3 DCV.Results:
OK: Proceed to 4.
NOT OK: System voltage is NOT correct. For troubleshooting, see the procedure for system voltage. STOP.
Check the setpoint P01.
Check the setpoint P01 for proper programming. For an ETR, the P01 is set at "0". For an ETS, the PO1 should be "1". See Systems Operation, "Setpoint Viewing OP2".Expected Result: Setpoint P01 should be programmed to match the type of fuel control solenoid that is used on the genset.Results:
OK: Proceed to 5.
NOT OK: Setpoint P01 is NOT programmed correctly. Reprogram setpoint P01. See Systems Operation, "Engine/Generator Programming OP5".
Check the fuses.
Turn the ECS to OFF/RESET.
Check fuses "F2" and "F10" on the relay module.Expected Result: None of these fuses should be blown. Results:
OK: Proceed to 6.
NOT OK: One or more of the fuses are blown. Proceed to 7.
Check the voltage at the relay module.Fuse "F4" remains removed from the relay module.
Prepare to measure the voltage from RM-15 to the B- terminal of the relay module.
Turn the ECS to OFF/RESET and then turn the ECS to START.
At the relay module, measure the voltage from RM-15 to the B- terminal. Expected Result: The voltage should be 2.0 DCV of the system voltage that was previously measured in 3.Results:
OK: Therefore, there is an open circuit between RM-15 of the relay module and the fuel control solenoid. Repair the circuit. See the preceding System Schematic. STOP.
NOT OK: Voltage is low. Proceed to 8.
Troubleshoot the blown fuse.This test continues troubleshooting from 5. For reference, see the preceding System Schematics and Testing And Adjusting, "Schematics and Wiring Diagrams".
The ECS remains in the OFF/RESET position.
Remove the fuse that is blown.
If the blown fuse is "F2", measure the resistance from RM-15 of the relay module to ground (B-).
If the blown fuse is "F10", measure the resistance from RM-39 of the relay module to ground (B-).Expected Result: The resistance of the circuit should be less than 3 ohms for the circuit with the fuse that is blown.Results:
OK: The resistance is greater than 3 ohms and the fuse is no longer blowing. Carefully check ALL wires that are connected to the appropriate terminal of the relay module for abrasion or worn spots in the insulation that could be causing the short. Check the wires in the panel. Check the generator panel.