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P1504 – Idle Air Control Circuit Fault

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Symptoms

  • Rough idle
  • Stalling
  • High idle

Causes

  • Damaged wiring
  • Faulty IAC valve
  • Connector corrosion

Diagnosis

  • Check wiring
  • Test IAC valve
  • Inspect connector

Repair

  • Repair wiring
  • Replace IAC valve
  • Clean connector
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