P1117 – ECT Sensor Low Input (Ford)

Description

P1117 Ford indicates the coolant temperature sensor signal is lower than expected.

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Symptoms

  • Slow warm-up
  • Poor fuel economy
  • Heater not warm

Causes

  • Short to ground
  • Faulty sensor
  • Wiring issues

Diagnosis

  • Check wiring
  • Measure ECT voltage
  • Inspect sensor

Repair

  • Repair wiring
  • Replace sensor