Overview

Engine Coolant Temperature 1 Sensor Circuit

Circuit Description

The engine coolant temperature 1 sensor is used by the engine control module (ECM) to monitor the engine coolant temperature. The ECM monitors the voltage on the signal pin and converts this to a temperature value. The engine coolant temperature value is used by the ECM for the engine protection system and for engine emissions control.

Component Location

The engine coolant temperature 1 sensor is located on the thermostat housing. Use the following procedure for a detailed component location view. Refer to

Procedure 100-002 in Section E.

Shop Talk

Before troubleshooting Fault Code 144, check for multiple faults.

The engine coolant temperature 1 sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active.

Possible causes of this fault code include:

• Open return circuit in the harness, connectors, or sensor

• Open signal circuit or shorted to a voltage source.

Refer to Troubleshooting Fault Code t05-144.

Last Modified: 26-Nov-2012

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