Electronic Modular Control Panel II (EMCP II) For MUI Engines Caterpillar

Illustration 1	g00614755
System Schematic For Fuel Control Relay On ETR Systems

Note: For 3408 and 3412 engines, the AFCR shall be connected to SR terminal 87 instead of fuel solenoid, and provided with F16.

Illustration 2	g00614757
System Schematic For Fuel Control Relay On ETS Systems

The GSC uses the fuel control relay (FCR) to activate the fuel solenoid (FS). The FCR is located within the relay module. The fuel solenoid is located in the fuel system of the engine.

There are two types of fuel system solenoids: energized to run (ETR) and energized to shutdown (ETS).

• For ETR systems, the GSC activates the FCR which energizes the fuel solenoid to run the engine.

• For ETS systems, the GSC activates the FCR which energizes the fuel solenoid to shutdown the engine.

Note: Whenever the GSC activates or attempts to activate the FCR, "K7" is shown on the lower display. When the FCR is not activated, "K7" is not shown. Also, setpoint P01 selects the fuel solenoid type: 0 = ETR or 1 = ETS.

The GSC treats this diagnostic code as an alarm fault. Active alarm faults are shown on the display when the alarm codes key is pressed. Also, the active alarm faults are shown when the ECS is in any position except the OFF/RESET position. Clear the diagnostic code from the fault log after troubleshooting is complete.

The possible cause of a CID 447 FMI 12 fault is:

• An open or shorted coil of the FCR.

The system response to this fault is:

• For ETR systems with the FCR activated - If a CID 447 fault occurs while the engine is running, then a CID 566 (unexpected shutdown) fault is declared and shutdown mode is functioning (the engine stops).

• For ETR systems with the FCR not activated - If a CID 447 fault occurs, then the engine can not start or run.

• For ETS systems with the FCR activated - If a CID 447 fault occurs, then the engine is able to run and start but the fuel solenoid will not shutdown the engine.

• For ETS systems with the FCR not activated - If a CID 447 fault occurs, then the engine is able to run and start but the fuel solenoid will not shutdown the engine.

Note: On 3500 engines equipped with an electronic governor, the status of the FCR has no effect on starting or running the engine.

The GSC treats a CID 447 fault as an alarm fault. Active alarm faults are shown on the display when the alarm codes key is pressed and the ECS switch is in any position except the OFF/RESET position. Clear the fault from the fault log after troubleshooting is complete.

This troubleshooting procedure is for an active or inactive CID 447 fault.

1. Check the status of the diagnostic code (Active/Inactive).

   1. Turn the ECS to OFF/RESET and then turn the ECS to STOP.

   2. Press the alarm codes key.

   3. Observe the upper display. Check that a CID 447 FMI 12 is showing.

   4. If the diagnostic code is not showing, enter the service mode. View the fault log (OP1). Check that the diagnostic code is showing.

      Expected Result: A CID 447 FMI 12 is showing as a active fault or an inactive fault.

      Results:

      • No - A CID 447 FMI 12 has not occurred (NOT active and NOT inactive). STOP.

      • Yes - A CID 447 FMI 12 is active or inactive. Proceed to 2.

2. Check internal cable of relay module.

   Note: Only open the relay module in a dry environment. If the inspection takes more than twenty minutes replace the desiccant bag in the GSC housing. See Testing And Adjusting, "Relay Module - Replace".

   1. Turn the ECS to OFF/RESET.

   2. Temporarily, remove the relay module from the GSC. See Testing And Adjusting, "Relay Module Replace".

   3. Check the cable that attaches the relay module to the GSC.

      Expected Result: The cable should be firmly seated in the connector. The clamp should be in place. The cable should not be damaged.

      Results:

      • OK - Reassemble the relay module to the GSC. Proceed to 3.

      • NOT OK - Replace the connector clamp if it is missing. If the cable is damaged, replace the GSC. STOP.

3. Perform a functional check for the ASR.

   1. Turn the ECS to OFF/RESET.

   2. Disconnect all wires from RM-15 of the relay module.

   3. At the relay module, measure the resistance from RM-15 to RM-4. Resistance should be greater than 5000 ohms.

   4. Turn the ECS to the START position. Make sure that "K7" is showing in the lower display.

   5. At the relay module, measure the resistance from RM-15 to RM-4. Resistance should be less than 5 ohms.

      Expected Result: For 3.c, the resistance should be greater than 5000 ohms. For 3.e, the resistance should be less than 5 ohms.

      Results:

      • OK - It is likely that a temporary bad electrical connection existed and this troubleshooting procedure corrected it. Check the electrical connectors, terminals and wiring. See Testing And Adjusting, "Electrical Connector - Inspect". STOP.

      • NOT OK - Either one of the resistance measurements are NOT correct. The relay module is faulty. Replace the relay module. See Testing And Adjusting, "Relay Module - Replace". STOP.