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P1660 – Idle Speed Control Auxiliary Output Fault

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Symptoms

  • Rough idle
  • Stalling

Causes

  • ECU driver fault
  • Wiring issue
  • IAC valve issue

Diagnosis

  • Inspect wiring
  • Test IAC valve
  • Scan ECU

Repair

  • Repair wiring
  • Replace IAC valve
  • Repair ECU
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