P1143 – Swirl Control Valve Vacuum Cut Valve (Nissan)

Description

The ECM detected improper operation of the swirl control valve vacuum cut valve.

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Symptoms

  • Rough idle
  • Poor acceleration
  • Hesitation
  • Reduced power
  • Check engine light

Causes

  • Faulty vacuum cut valve
  • Vacuum leak
  • Stuck swirl flaps
  • Wiring issues

Diagnosis

  • Inspect vacuum lines
  • Test valve operation
  • Check wiring
  • Scan live data

Repair

  • Replace vacuum cut valve
  • Repair wiring
  • Fix vacuum leaks
  • Clean swirl flaps

Related Problems

Related Fault Codes