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

Illustration 1	g00596060
Schematic For Temperature Sensor (Engine Coolant)

In order to find the cause of a shutdown due to a high water temperature, perform this procedure.

1. Check for a diagnostic fault.

   1. Check for an active CID 110 or CID 269 diagnostic code. See Testing And Adjusting, "Troubleshooting Diagnostic Codes".

      Expected Result: CID 110 or CID 269 should not be showing.

      Results:

      • OK - Proceed to 2.

      • Not OK - Correct the active CID 110 or CID 269 prior to proceeding with this procedure. See Testing And Adjusting, "Troubleshooting Diagnostic Codes". STOP.

2. Check obvious causes.

   1. Check water level.

   2. Check fan drive belts.

   3. Check for other obvious causes of high water temperature.

      Expected Result: No obvious cause should exist.

      Result:

      • OK - Proceed to 3.

      • Not OK - Correct the active CID 110 or CID 269 prior to proceeding with this procedure. See Testing And Adjusting, "Troubleshooting Diagnostic Codes". STOP.

3. Check Setpoint P15 (high water temperature).

   1. View the setpoint P15. See Systems Operation, "Engine/Generator Setpoint Viewing OP2".

   2. Compare the setpoints that are viewed with the specified setpoints of the particular generator set.

      Expected Result: The setpoint value that is viewed and the setpoint value that is specified should agree.

      Results:

      • OK - Proceed to 4.

      • Not OK - The setpoints do not agree. Reprogram setpoint P15. See Systems Operation, "Engine/Generator Programming OP5". STOP.

4. Check the function of the high water temperature.

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

   2. Allow water temperature to stabilize.

   3. Check the actual water temperature that is showing on the lower display.

   4. Compare the actual temperature that is showing on the lower display with setpoint P15.

      Expected Result: The actual temperature that is showing on the lower display should be less than setpoint P15. This actual temperature should not cause a shutdown due to a high water temperature.

      Results:

      • OK - The actual temperature is less than the setpoint P15 and the high water temperature indicator does not FLASH. The problem is not present now. The problem may be intermittent. Check the harness and all the electrical connections of the circuit for the water temperature. See Testing And Adjusting, "Electrical Connector - Inspect". STOP.

      • OK - The actual temperature is less than the setpoint P15 and the high water temperature indicator remains FLASHING. Therefore, the GSC is faulty. Replace the GSC. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". STOP.

      • Not OK - Actual temperature that is showing is greater than the setpoint P15. The temperature is correct for shutdown due to a high water temperature. Therefore, the engine should shut down and the indicator for high water temperature should FLASH. The GSC is operating properly. Refer to the Engine Service Manual in order to find the cause of high water temperature. STOP.

      Note: The following procedure checks the accuracy of the temperature that is shown on the lower display of the GSC. Install an accurate engine coolant temperature gauge with the sensing element in an area of high coolant flow. Also, install the gauge as close as possible to the coolant temperature sensor of the EMCP II.