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Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 334 PID: P110 SPN: 110 FMI: 2 LAMP: Amber SRT: |
Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect. The engine coolant temperature reading is not changing with engine operating conditions. |
The ECM will estimate engine coolant temperature. |
 Engine Coolant Temperature Sensor
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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 use by the ECM for the engine protection system and engine emission control.
Component Location
The engine coolant temperature sensor is located on the thermostat housing. Refer to Procedure 100-002 (Engine Diagrams) in Section F for a detailed component location view.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
Two different failure modes of the engine coolant temperature sensor can trigger this fault code. Either the sensor is not reading ambient air temperature after an extended period with the engine not running or the engine coolant temperature is not changing with engine operating conditions.
Possible causes of this fault code include:
- Stuck in-range engine coolant temperature sensor
- High resistance in the engine coolant temperature sensor signal or return lines.
Refer to Troubleshooting Fault Code t05-334
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