P1204 – Injector Circuit Malfunction (Cylinder 4, Nissan)

Description

The ECM detected an injector circuit malfunction on cylinder 4.

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Symptoms

  • Misfire
  • Rough idle
  • Poor acceleration
  • Check engine light

Causes

  • Faulty injector
  • Open/short wiring
  • Connector corrosion

Diagnosis

  • Check injector pulse
  • Inspect wiring
  • Test injector resistance

Repair

  • Replace injector
  • Repair wiring
  • Clean connectors