P0634 – PCM Temperature Sensor Circuit

Description

The PCM temperature sensor circuit is malfunctioning.

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Symptoms

  • Check engine light on
  • Car has electrical problems

Causes

  • Sensor failure
  • Wiring fault
  • Connector corrosion

Diagnosis

  • Inspect wiring
  • Test sensor resistance
  • Check PCM input

Repair

  • Replace sensor
  • Repair wiring
  • Clean connector