Not so square wave

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  • Dr Dave
    Member
    • Nov 2010
    • 51

    Not so square wave

    Can some one tell me what this square wave from a Toyota VVT oil control solenoid 4.0 means? I think that since the wiring to the ECM check out I see the ECM not able to pull a solid ground .That would be a ECM internal /transister? or maybe a bad ground to the ECM/?
  • Dr Dave
    Member
    • Nov 2010
    • 51

    #2
    attmt.

    hopefully this is it if not Ill try tomarrow at the shop
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    • Rich Shepherd
      Snap-on D&I
      • Nov 2006
      • 553

      #3
      Originally posted by Dr Dave
      Can some one tell me what this square wave from a Toyota VVT oil control solenoid 4.0 means? I think that since the wiring to the ECM check out I see the ECM not able to pull a solid ground .That would be a ECM internal /transister? or maybe a bad ground to the ECM/?
      A square wave will look like the one in your image if your black lead is not making a connection to ground. Since the waveform looks normal when you connect the black lead to the battery negative, check your ground connection at the sensor when connecting there.

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