P0119

DTC P0119: Engine Coolant Temperature (ECT) Sensor Circuit Intermittent

Wiring Diagram:

Circuit Description
DTC P0119 checks the rationality of engine coolant temperature sensor to compare former with current measured coolant temperature. If the difference between 2 temperature values is too big, engine coolant temperature sensor should not be rational. Engine coolant temperature is read every 500 ms.

Conditions for Setting the DTC
- Ignition ON.
- Battery voltage is higher than 10.46 V.
- Difference between the last measured ECT and measured ECT is higher than 5.25 degrees C (41.45 degrees F).

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fail. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF at the end of 3 consecutive validation cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 warm up cycles without a fault.
- DTC(s) can be cleared by using the scan tool.

Diagnostic Aids
Check for any of the following conditions:
- Check for a faulty electrical connection to the ECM.

An intermittent malfunction may be caused by a fault in the ECT sensor electrical circuit. Inspect the wiring harness and components for an intermittent condition. Repair any electrical circuit faults that were found. If a DTC P0119 cannot be duplicated, the information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC was first set.

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DTC Troubleshooting