Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Interfacing with the ECU

  1. #1
    Maximum Bitrate
    Join Date
    Sep 2001
    Posts
    744

    Interfacing with the ECU

    Hey Aaron or anyone else,
    Have you ever messed with the powertrain control module on your car? According to my 1997 Chevrolet Malibu's wiring diagrams, the automatic transmission shifting is controlled by all of the on/off combinations of 2 solenoids; corresponding to 1, 2, 3 and overdrive. It appears the input signal to these 2 solenoids is attached to the diagnostic port under the dash; pins 11 and 17 I think. Could it be possible then, if I grounded pins 11 and 17 according to the way I want the automatic transmission to shift, that I could make my car shift tiptronically?

    Just wondering if anyone else has tried this. I got ahold of Mitchell's On-Demand 2002 software. It has all the technical information on import and domestic cars from 1983 - 2002 you could ever want.

  2. #2
    Retired Admin Aaron Cake's Avatar
    Join Date
    Jan 2000
    Location
    London, Ontario, Canada
    Posts
    2,464
    I haven't done anything like that...The RX-7 ECU is very primitive, and most people replace it if they get into any serious modding...

    Sorry, can't help. I know there are some past threads on this, but I don't know how much info they contain...
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  3. #3
    Rob
    Rob is offline
    Maximum Bitrate Rob's Avatar
    Join Date
    Aug 2001
    Location
    Missing In Action
    Posts
    779
    I think Ashley Powers interfaced his ECU to his PC, but that was only to read engine info, might be a starter for ten.

    Rob
    And you say people actually pay money for M$ Windows?
    www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
    Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)

  4. #4
    Constant Bitrate
    Join Date
    Dec 1999
    Location
    Austin, TX
    Posts
    117
    You might want to look up OBD-II. That's the On Board Diagnostics that post 1995 cars have. I know there's at least one company selling OBD-II -> serial adapters, but I do not know if they are both read and write.

  5. #5
    Newbie
    Join Date
    Jun 2001
    Location
    Cape Coral, Florida
    Posts
    32
    This can be done very easly.
    I currently do it with my 94 Trans Am, which is a OBD 1 Car. So Software is Free and easy to come by. I just have a ALDL Cable pluged into my cars Diagnostic Port under the dash. And it is interfaced with my Laptop. I also have specialty software that will let me mod. any of the settings on the onboard computer for racing and tuning reasons.

    For most of you, I think that it would be a waste. I have invested lots of money and lots of down time from screwing **** up from doing this, one wrong move and your onboard GM PCM is dead. I am my thrid PCM, which has lots of features in it so that I can not **** it up. It is cool for me to have these features in my car do to the mass amount of modafications that i have done.

    Just my $.02 on the subject, but if you have a 96 and newer car check out www.autotap.com, they make systems for GM, Ford, Chrysler, And Import cars, These are all serial based systems that interface with your cars PCM (ECU). ATap will only do diagnostics, there is no tuning with that system, that is the standard for personal use diagnostics.

    ~Gary
    1994 Pontiac Trans Am
    LT1 350 - Fully Built Motor

  6. #6
    Maximum Bitrate
    Join Date
    Sep 2001
    Posts
    744
    So GMJArts, are you saying you control your shifting via the laptop then? If so, is what I'm saying correct? Can it be done without software?
    You gave a link to the autotap software, but like I stated in my original post, I'm looking to control when the automatic transmission shifts, not just obtain measurements.

  7. #7
    Newbie
    Join Date
    Jun 2001
    Location
    Cape Coral, Florida
    Posts
    32
    What kind of car do you have, I only know of a few high performace cars that have direct conection software to make these changes without the use of like a hex editer.

    Late Model GM's, Mustangs. That is about all I in know of.

    ~Gary
    1994 Pontiac Trans Am
    LT1 350 - Fully Built Motor

  8. #8
    Maximum Bitrate
    Join Date
    Sep 2001
    Posts
    744
    I have a 1997 Chevrolet Malibu. I"m not sure you know what i'im asking. I want to control my transmission shifts on the fly, like an F1 transmission, with the press of a button. Not change at what point that the computer shifts automatically. I also want to do this without software.

    Seeing the diagram of my car's wiring show me that solenoids A and B control the transmission shifts, made me think it might be as simple as varying whether or not pin 11 and 17 are connected to ground or not.

  9. #9
    Maximum Bitrate
    Join Date
    Nov 1999
    Location
    Sydney NSW Australia
    Posts
    581

    Re: Interfacing with the ECU

    Originally posted by SuperMatty
    Just wondering if anyone else has tried this. I got ahold of Mitchell's On-Demand 2002 software. It has all the technical information on import and domestic cars from 1983 - 2002 you could ever want.
    I havn't done anything like this but im planing to... If you could help me that is
    Well as you said you got this software "Mitchell's On-Demand 2002"... does it have any info on Mazda 323 GT/GTX/GTR or Ford Laser TX3, Ford Capri Turbo? 86-89 model is what im after...
    I had a long post one one of the forums talking about this topic.
    Search for "Mp3car to control your car".
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  10. #10
    Maximum Bitrate
    Join Date
    Sep 2001
    Posts
    744
    Unfortunately it does not have any of the cars you mentioned listed.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •