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Can not connect to VCM

This is a discussion on Can not connect to VCM within the Computer & Tuning forums, part of the LSx Technical Help Section category; Long story http://www.ls1.com/forums/f6/i-need-...49/index2.html Short story tired to connect my HPTuners up and it says it can not connect to VCM. ...

  1. #1
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    Can not connect to VCM

    Long story I need HELP. My car won't start

    Short story tired to connect my HPTuners up and it says it can not connect to VCM. This is the first time I have tried to connect to this car.

  2. #2
    Senior Member 2002ssslp's Avatar
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    Silver & Blue
    02 Camaro SS, 04 GTO

    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  3. #3
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    Checked all fuses and replaced battery. Still can not connect

  4. #4
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    have you checked the fuse for the obd connector? It's on the same circuit as the cig lighter. That would be the first place I would check.

  5. #5
    Blown, Stroked, & Sprayed

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    383 Procharged & N20 Vert

    Battery has a good charge?
    Harness on the VCM good and tight?

  6. #6
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    I checked ALL fuses by sight and by volt meter. Then tonight rechecked the improtant fuses. Also the cig light has power.

    Ed it is a brand new battery I bought tonight. I didn't check it, but it turns the starter with no problems.

  7. #7
    Blown, Stroked, & Sprayed

    Ed Blown Vert's Avatar
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    383 Procharged & N20 Vert

    Are you trying to scan or read your VCM? If you can't do either try reading another car just to make sure your cable is ok.

  8. #8
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    reading 12.4 volts at the battery

  9. #9
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    I have tired the scanner and the editor. Neither will connect. I have 6 of my 8 credits left. I use to on my orginal car.

    I will go try to connect to another car brb.

  10. #10
    Blown, Stroked, & Sprayed

    Ed Blown Vert's Avatar
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    Quote Originally Posted by blackcar View Post
    I have tired the scanner and the editor. Neither will connect. I have 6 of my 8 credits left. I use to on my orginal car.

    I will go try to connect to another car brb.
    You won't waste a credit if you are just reading.

  11. #11
    Veteran 0rion's Avatar
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    is this through a laptop with a usb port or are you using a usb adapter? I've seen those adapters cause problems. Can you plug the cable in and read your available credits and things like that? What version software are you using?

  12. #12
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    It hooked up to our 2001 Surburban with no problems.

    It is an old lap top but it does have USB plugs. Yes I was able to pull up my old car and read i had used two credits on it.

    I'm using the newest version of HPT off the website. Running XP on the laptop. Reformatted the laptop over the weekend and put the newest version of hpt on it.

  13. #13
    Veteran 0rion's Avatar
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    sounds like it's on the car end then. I would check for power at the plug with a volt meter

    pinout for connector
    OBD II Connector Pinout

  14. #14
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    thanks. Printed out and will check tomorow.

  15. #15
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    Couldn't wait till tomorow. Checking from the ground pin to the power pin. With the key off it checked fine. 12.? volts. With the key in run it dropped to about 4 volts. I know enough about voltage that it is the difference in the voltage that is measured. So I found a ground bolt turned the key on and the power pin had 12 volts the ground pin had 8. Turn the key off and the ground goes back to zero. So how can I tell if it is in the pcm or a ground out wire??

  16. #16
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    Start simple. Pull the connectors off the pcm and look for corrosion on the pins. That would probably be the first place I would start. I'm not sure on that OBD port harness how it runs back to the pcm but I *think* it's serial.

  17. #17
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    I will recheck the pins on the PCM, closer this time. I looked at them before but didn't see anything wrong. But there is a bunch and they are small.

  18. #18
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    Update Still no start

    Found the Crank position sensor was broken. I must have broke it while pulling the exhaust manifold out during the header install. Fixed that and it still won't start.

    I found out there are two grounds on the ODB II port. A chassis ground and a signal ground. The chassis ground is good. It is the signal ground that is showing 10 volts with the key in run. When I pull the 20 amp eng sensor fuse it goes down to about 2 volts. According to my Haynes book the eng sensor fuse powers the O2 sensors, stop lamp switch, Reverse inhibit solenoid, skip, shift solenoid, and the MAF. I unplugged everything except the stop lamp switch and the short is still there.

    How can I tell if the short is in the PCM or the PCM is bad? Anybody got any other ideas? I'm at a loss.

  19. #19
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    Still haven't found the problem. There have been some updates here I need HELP. My car won't start

    Please help. I'm ready to get this car back running and move on to other projects that have been waiting on this. I got asked again today by my wife when I'm going to get so-and-so done.

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