P1509 – Idle Air Control Valve High Voltage (Nissan)

Description

The ECM detected high voltage in the IACV circuit.

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Symptoms

  • Check engine light
  • Rough idle

Causes

  • Short to power
  • Valve failure
  • ECM driver issue

Diagnosis

  • Check wiring for shorts
  • Inspect valve
  • Scan idle data

Repair

  • Repair wiring
  • Replace valve