M42 idle control valve - control method

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  • burkey001
    Mod Crazy
    • Feb 2011
    • 608
    #1

    M42 idle control valve - control method

    Hi,

    Does anyone know how the IACV is controlled?

    is it PWM or simply variable voltage from 0-12?

    Have yet to put a probe on pin 29 of ECU.


    Just interested :)

    thanks

    88 325is. S54, CSL airbox, Motec M800, Motec C127, Motec PDM15, Stoptech STR, MCS 2 way coilovers, Forgeline wheels, Recaro SPA, Eisenmann, Personal, lots of custom.

    90 318is. As new OEM+, BBS LM, AST 4210 2 way coilovers, Wilwood SL6R/SL4R, Dynaudio, Recaro Experts
    Tags: None
    • bmwman91
      No R3VLimiter
      • Oct 2004
      • 3128
      #2
      The ECU drives it with a ~100Hz PWM signal.

      Transaction Feedback: LINK

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        • burkey001
          Mod Crazy
          • Feb 2011
          • 608
          #3
          perfect, thank you
          88 325is. S54, CSL airbox, Motec M800, Motec C127, Motec PDM15, Stoptech STR, MCS 2 way coilovers, Forgeline wheels, Recaro SPA, Eisenmann, Personal, lots of custom.

          90 318is. As new OEM+, BBS LM, AST 4210 2 way coilovers, Wilwood SL6R/SL4R, Dynaudio, Recaro Experts

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