P1500 – Alternator FR Signal Circuit (Nissan)

Description

The ECM detected a fault in the alternator FR (field response) signal circuit.

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Symptoms

  • Battery light
  • Low charging

Causes

  • Wiring issue
  • Alternator fault
  • ECM signal error

Diagnosis

  • Check FR signal
  • Inspect wiring
  • Test alternator

Repair

  • Repair wiring
  • Replace alternator