P1605 – Rough Idle / Forced Idle (Nissan)

Description

The ECM detected forced idle activation due to abnormal engine operating conditions.

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Symptoms

  • Rough idle
  • Limp mode

Causes

  • Air leak
  • Throttle issue
  • ECM protection

Diagnosis

  • Check vacuum lines
  • Inspect throttle body
  • Scan ECM data

Repair

  • Repair leaks
  • Clean throttle body