Electronic Modular Control Panel II (EMCP II) Caterpillar

Illustration 1	g00479560
System Schematic For Engine Coolant Loss Sensor (ECLS)

In order to find the cause of a low level shutdown, perform this procedure.

Test Step 1. CHECK THE COOLANT LEVEL.

1. Check the level of the engine coolant. See the Operation And Maintenance Manual for the engine.

Expected Result:

The coolant level should be at the proper level. The coolant level should be above the probe of the coolant loss sensor.

Results:

• OK - The coolant level is at the proper level. Proceed to Test Step A.

• NOT OK - Coolant level is not correct.

  Repair: Find the cause and correct the cause. Refer to the Engine Service Manual.

  Stop.

Test Step 2. CHECK FOR A DIAGNOSTIC FAULT.

1. Turn the engine control switch (ECS) to the OFF/RESET position and then turn the ECS to the STOP position.

2. Wait for ten seconds.

3. Check for an active CID 111 diagnostic code. CID 111 describes the coolant loss sensor. See Testing And Adjusting, "Troubleshooting Diagnostic Codes".

Expected Result:

CID 111 should not be showing. The indicator for the low coolant level should not be FLASHING.

Results:

• OK - No CID 111 diagnostic codes are active. The indicator for the low coolant level is OFF.

  Repair: Therefore, the fault may be intermittent. Check the harness and all the electrical connections of the circuit for the low coolant level. See Testing And Adjusting, "Electrical Connector - Inspect".

  Stop.

• NOT OK - CID 111 is active.

  Repair: Correct the active CID 111. See Testing And Adjusting, "Troubleshooting Diagnostic Codes".

  Stop.

• NOT OK - CID 111 is NOT active. The indicator for the low coolant level is FLASHING.

  Repair: Therefore, the sensor has failed. Replace the coolant loss sensor.

  Stop.