How to test a Nissan 6-wire stepper type IAC motor.

Engine Performance Diagnostics Chapter 20 pages 15-20

symptoms 50

  • stalling
  • start stall
  • high idle
  • check engine light (P0505 trouble code)

fix 50

  • replace faulty IAC valve

test shown enh 50

  • how to test a 6 - wire stepper motor
  • how to verify control circuit integrity
  • how to test a computer driver
  • IAC motor voltage waveforms

Tools used

  • test light (LED type is preferred for this test)
  • lab scope
  • scan tool
  • back-probing tools

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(Chapter 20) Idle Speed Problems and Testing

Related videos:

Idle speed control error fault codes (P0507) - vacuum leak:


Ford idle air control valve (IAC) test - stalling problems :


Ford Idle Air Control (IAC) valve test (how to adjust minimum idle speed):


Solenoid Type idle air control valve IAC test using a Picoscope - Ford:


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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