P1508 – Idle Air Control Valve Circuit Fault (Nissan)

Description

The ECM detected a malfunction in the IACV circuit.

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Symptoms

  • Rough idle
  • Hesitation

Causes

  • Open circuit
  • Shorted wiring
  • Valve failure

Diagnosis

  • Check wiring continuity
  • Test valve
  • Inspect connectors

Repair

  • Repair wiring
  • Replace valve