P1117 2009 FORD FUSION - Engine Coolant Temperature Sensor Intermittent

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3

P1117 2009 FORD FUSION Causes

  • Low Engine Coolant Level
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
  • Faulty Engine Coolant Thermostat
  • Damaged Powertrain Control Module (PCM)
  • P1117 2009 FORD FUSION Notes

    Monitor the ECT on a scan tool. Look for sudden changes in the reading when the harness is wiggled or the sensor is tapped.

    First diagnose P1117 2009 FORD FUSION code

      Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

    Cost of diagnosing the P1117 2009 FORD FUSION code

      Labor: 1.0

      The cost of diagnosing the P1117 2009 FORD FUSION code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

    P1117 2009 FORD FUSION Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine Overheating
  • P1117 2009 FORD FUSION More Information

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    P1117 2009 FORD FUSION Description

    The Engine Coolant Temperature (ECT) Sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.

    Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor (pull-up resister) in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.

    The ECT measures the temperature of the engine coolant. The PCM uses the ECT input for fuel control and for cooling fan control. There are 3 types of ECT sensors; threaded, push-in, and twist-lock. The ECT sensor is located in an engine coolant passage.