P1583 – Idle Control System High RPM (Nissan)

Description

The ECM detected idle speed higher than expected.

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Symptoms

  • High idle
  • Surging

Causes

  • Vacuum leak
  • Valve stuck open
  • ECM logic fault

Diagnosis

  • Check vacuum lines
  • Inspect valve
  • Scan idle data

Repair

  • Repair leaks
  • Replace valve

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