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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. |
Automotive: Possible white smoke. Fan will stay ON if controlled by ECM. No engine protection for engine coolant temperature. 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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On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines):
- The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The ECM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. The MIL lamp and fault code can also be cleared using the INSITE™ service tool.
- The fault code will be cleared from memory after 40 consecutive drive cycles where the diagnostic runs and passes.
On-Board Diagnostics (OBD) Information (Euro 4 Stage 1+ Certified Engines):
- The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- An engine torque derate will be activated after 50 hours of engine operation with the fault code active.
- The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The MIL lamp cannot be cleared using the INSITE™ service tool.
- The fault code will be cleared from memory after 400 days or 9600 hours of engine operation.
Refer to Troubleshooting Fault Code t05-145
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