P1504 – Idle Air Control Valve Signal Fault (Nissan)

Description

The ECM detected a fault in the idle air control valve signal.

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Symptoms

  • Rough idle
  • Stalling

Causes

  • IACV failure
  • Wiring issue
  • ECM driver fault

Diagnosis

  • Check IACV signal
  • Inspect wiring
  • Test valve

Repair

  • Replace IACV
  • Repair wiring