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Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 145 PID: P110 SPN: 110 FMI: 4/4 LAMP: Amber SRT: |
Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at engine coolant temperature circuit. |
Marine: calibration dependent. |
 Engine Coolant Temperature Sensor Circuit
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Circuit Description
The engine coolant temperature sensor is used by the electronic 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 engine emissions control.
Component Location
The engine coolant temperature sensor is located on the thermostat housing.
Refer to Procedure 100-002 for a detailed component location view.
Shop Talk
The engine coolant temperature 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.
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Temperature (°C)
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Temperature (°F)
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Resistance (ohms)
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0
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32
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30k to 37k
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25
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77
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9.3k to 10.7k
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50
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122
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3.2k to 3.8k
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80
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176
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1.0k to 1.3k
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95
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203
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700 to 800
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Refer to Troubleshooting Fault Code t05-145
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