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FAULT CODE 144

Engine Coolant Temperature 1 Sensor Circuit - Voltage Above Normal or Shorted to High Source

Overview


CODE

REASON

EFFECT

Fault Code: 144

Engine Coolant Temperature 1 Sensor Circuit - Voltage Above Normal

Possible white smoke. Fan will stay ON if

PID:

or Shorted to High Source. High signal voltage detected at engine

controlled by ECM. No engine protection for engine

SPN: 110

coolant temperature circuit.

coolant temperature.

FMI: 3/3



LAMP: Amber



SRT:



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.


Temperature (°C)

Temperature [°F]

Resistance (ohms)

0

32

30k to 37k

25

77

9.3k to 10.7k

100

212

640 to 720

Refer to Troubleshooting Fault Code t05-144.


Last Modified: 26-Nov-2012

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