Overview

Engine Coolant Temperature 1 Sensor Circuit

Circuit Description

The engine coolant temperature 1 sensor is used by the 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 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

The engine coolant temperature 1 sensor shares return wires in the engine harness with other sensors. A shorted return can cause multiple fault codes to be active. Before troubleshooting Fault Code 145, check for multiple fault codes.

Possible causes of this fault code include:

• Signal shorted to ground in the harness

• Signal shorted to return or ground in the sensor.

Refer to Troubleshooting Fault Code t05-145.

Last Modified: 26-Nov-2012

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