P1557 – Accelerator Pedal Position Sensor High (Nissan)

Description

The ECM detected a high input signal from the accelerator pedal position sensor.

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Symptoms

  • High idle
  • Surging

Causes

  • Short to power
  • Sensor failure
  • Wiring issue

Diagnosis

  • Check wiring for shorts
  • Inspect sensor
  • Scan throttle data

Repair

  • Repair wiring
  • Replace sensor