CONNECTION 2882356 - Caterpillar

Illustration 1 g01132788
Schematic For The Engine Coolant Temperature SensorNote: This diagnostic code comes from the Engine ECM to the Machine ECM through the Cat Data Link. First diagnose any other diagnostic code before attempting to diagnose the CID 0110, FMI 04 diagnostic code.This diagnostic code is recorded when the monitoring system reads a low sensor signal. When this diagnostic code occurs, the gauge indicates an abnormally high value. The following symptoms could cause the diagnostic code:
The sensor has failed.
The signal circuit in the machine harness is shorted to ground.
The monitoring system has failed.Note: The monitoring system is unable to determine when a sensor is open. Also, the monitoring system is unable to determine when a harness for the sensor signal is open. This condition is recognized when the gauge constantly indicates a value at the far left side of the scale.Service Notes: Ensure that the desired diagnostic code is on hold. Ensure that the code is active. The schematic that is shown above represents a typical installation of the component. Verify the connector contact and wire numbers by using the Electrical System Schematic for the machine that is being serviced. Test Step 1. CHECK THE MONITORING SYSTEM AND THE HARNESS.
Turn the disconnect switch and the key start switch to the ON position.
The diagnostic code is active.
Disconnect the machine harness from the sensor that is causing the diagnostic code.
Observe the diagnostic code indicator.Expected Result:The diagnostic code indicator is ON.Results:
YES - The diagnostic code indicator stays ON. The harness wiring or the monitoring system has failed. Proceed to test step 2.
NO - The diagnostic code indicator turns OFF. The sensor has failed.Repair: Replace the sensor. Stop.Test Step 2. CHECK THE SIGNAL WIRE FOR A SHORT TO GROUND.
The disconnect switch and the key start switch remain in the ON position.
At the machine harness for the sensor, measure the voltage between the frame ground and the sensor signal wire.Expected Result:The voltage that is measured is within one of the following specifications.Results:
6.0 0.5 DCV - The voltage is 6.0 0.5 DCV. The voltage is correct. Verify that the diagnostic code remains.Repair: It is unlikely that the monitoring system has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. If the cause of the diagnostic code is not found, replace the monitoring system. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
LESS THAN 0.5 DCV - The voltage is less than 0.5 DCV. The harness wiring has failed. There is an open circuit or a short to ground in the signal wire for the sensor. Repair: Repair the harness or replace the harness. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. It is unlikely that the monitoring system has failed. If the cause of the diagnostic code is not found, replace the monitoring system. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
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