CUMMINS FAULT CODE 145

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FAULT CODE 145

Engine Coolant Temperature 1 Sensor Circuit - Voltage Below Normal or Shorted to Low Source

Overview


CODE

REASON

EFFECT

Fault Code: 145

Engine Coolant Temperature 1 Sensor Circuit - Voltage Below

Possible white smoke. Fan will stay ON if controlled by

PID:

Normal or Shorted to Low Source. Low signal voltage detected at

engine control module (ECM). No engine protection for

SPN: 110

engine coolant temperature circuit.

engine coolant temperature.

FMI: 4



LAMP: Amber



SRT:



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.


Temperature (°C)

Temperature (°F)

Resistance (ohms)

0

32

30k to 37k

25

77

9.3k to 10.7k

50

122

3.2k to 3.8k

80

176

1.0k to 1.3k

95

203

700 to 800

Refer to Troubleshooting Fault Code t05-145.


Last Modified: 26-Nov-2012

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