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Lazy boost after board swap

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  • Lazy boost after board swap

    Recently I swapped my SM4 1.09 plugin for another identical board because mine has hardware issues (huge thanks to Ian for helping me diagnose it!)

    I noticed boost issues, where boost would build very slow, and would not hit target even with boost offset compensations - and the according the the logger the valve doesn't seem to increase the duty to try and hit target boost...
    I thought I had a leak, or my turbo was dying - checked to confirm there are no leaks, and connected manual boost controller instead - that did the trick! instant boost, and hits any target I set

    so either the MAC valve is faulty (for no reason, as I didn't touch it) or there is something odd with the new board... I don't have another MAC valve handy, so before I go buy another one, is there anything I can inspect?

    the only other thing I did, was removing the purge solenoid (EVAP) from the car, and deleted it from the cal
    Last edited by Hyper; June 12th, 2016, 02:36 AM.

  • #2
    Put the purge valve back and see if the issue is resolved. Then trace the problem. The main problem
    is usually between the steering wheel and driver's seat however.
    He gets his lap dogs to do his talking for him. Buzzard is a good example.

    Comment


    • #3
      no Chris, the problem is not between the steering wheel and driver's seat
      I am not getting any ground out of pin D24 with either engine on or off, and this is what's causing the problem
      seems I have another faulty ECU, great...
      Last edited by Hyper; June 12th, 2016, 04:02 PM.

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      • #4
        Your cal doesn't seem to have anything on Output 6 (pin 16 of the same connector). Do you want to swap the pins and change the assignment in the cal.

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        • #5
          That's almost what I ended up doing - I broke my pin extraction tool, so I had to throw a wire from the purge valve connector is to the boost valve connector, and assigned Output 6 (pin 16) for now - happy boosting is back!

          I checked the manual, and it doesn't seem D24 is jumper dependent, so I assume there is a hardware issue? Could you tell me what I should trace/diagnose with a multi meter? I guess it would be cheaper to fix both boards at once

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          • #6
            I believe those outputs are pretty robust so that is an unusual failure. I will check if there is a test procedure for that output. In the normal installation for that ECU do you know if the output is connected to anything?

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            • #7
              It was being used on a normally aspirated car with 2002 AVCS wiring harness, so I don't think so, but I will try to find out

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              • #8
                confirming, D24 was not used in the car it was installed in
                before that, the board was used on our old drag car 5 years ago, didn't have any problems with boost back then, and has been laying on the shelf ever since

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