Question about 1996 Chevrolet Tahoe

8 Answers

Hey hows it going, i talked to you before about my problem with my 96 chevy tahoe. The speedometer wasnt workin, transmission wasnt shifting it was just running on in second, and the abs system was acting funny. So after much thought you pointed me to my ECM. I replaced that and its still doing the same thing. Are there any other suggestions? i dont know if I mentions this, but this all started when my starter went out and started blowing out the 40amp maxi fuse for ignition A. So like a idiot a but in a 50 amp to try and just get it started so I can get home (bad idea i know now) after i figured out it was the starter that was the problem i replaced it, and that was the start of the current problems, so is there anything else that I could of maybe shorted out in the process of putting in that higher amp fuse?

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  • jnero402 Jun 04, 2010

    when i start the car and drive the components listed work fine, until the truck warms up, then they all crash simultaneously.

  • jnero402 Jun 04, 2010

    thanks

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8 Answers

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  • Master
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Nobody can diagnose this without using a diagnostic scanner that shows data and codes. Then you will need the manufacturer diagnostic procedures when you find something wrong. I hope you did not just replace the PCM without properly diagnosing this.. If nothing happened after you put the 50amp fuse in I doubt it caused a new problem. Usually a wire will smoke if the short is still happening.. At this point its anybodys guess at what could be wrong because if the larger fuse damaged a computer there is no way to know by just guessing. Your best bet now is to go to mitchell1diy online and get the information thats needed to figure ths out. Your going to need diagnostic sklls and and the proper tools to proceed.

Posted on Jun 04, 2010

  • Susan Price Jun 04, 2010

    this is why you need a scanner, if you can't see the data for the components then the only option is to start throwing parts at this. We don't know if your loosing battery power or a component is shutting down because it hot.

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  • Master
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Hello,

Thanks for using FixYa.

The current problem may be with the vehicle's entire wiring system. After you put the 50amp fuse back there, wires will overheat and their shielding will melt. Wires will melted shield will short with other wires that suffered the same problem.

I hope this gives you an idea on what is going on. I suggest that you have your vehicle's entire wiring system checked. Thanks and good day
HotRatchet

Posted on Jun 04, 2010

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  • Master
  • 1,297 Answers

In the left wheel well is a little computer called the VCM, (vehicle control module)

basically the VSS, (vehicle speed sensor) located at the end of your transfer case or transmission, sends a signal to the VCM and then the VCM sends it to other computers including your ABS computer and the ECM, (engine control module) your "main" computer

here is a schematic of the input/outputs of the sensors and computers

hey hows it going, i - eb4a7a5.gif

had lots of problems with them
when it goes bad the ABS and ECM are confused to actual engine speed and symptoms include...

  • transmission won't shift
  • speedometer erratic or inoperative
  • ABS activation with normal braking or no activation at all
the next part I'd try is the VCM

Sean

Posted on Jun 04, 2010

  • 1 more comment 
  • jnero402 Jun 04, 2010

    i actually replaced both the ecm and the vss, is there anything else it might be?

  • Sean Reisdorf
    Sean Reisdorf Jun 04, 2010


    well then it sounds like we need to confirm some input data to the VCM

    install some jumper leads because I am assuming you do not have a GM breakout box

    you'll need 3 sets
    one for each front wheel speed sensor and one for the VSS
    run these jumpers to the interior
    then while driving you can monitor actual inputs

    I suspect that one of these sensor CIRCUITS is shorted together and the only way you are going to find them is by testing LIVE data


  • jnero402 Jun 04, 2010

    ok thanks man

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Yes the fuse with higher amp can make some wiring's short.But not always in some cases a bit  higher amp fuse supports in some it affects.So as per the problem you mentioned it indicates that the higher ampere fuse affected the wiring's.There are also many other possibilities for this problem.I will mention that too.
Most likely cause is a bad ignition switch, some of the contacts can get bad an not supply power(or enough power) to the trans. When this happens you have no PRNDL, no tach, no speedo, no automatic shifting unless manually shifted, and third gear starts unless shifted manually.If the ignition switch checks out OK. Then problem can be in a speed sensor.The transmission speed sensor/connector/wiring is bad.speedometer is generated from this transmission sensor..with no output this will cause your problems.This has to be checked.
Thanks. keep updated for any more query.You can rate this solution and show your appreciation.

Posted on Jun 04, 2010

  • jnero402 Jun 04, 2010

    i tried a new ignition switch and also a new speed sensor. When i start the car and drive, all those components i listed before run fine, until the car warms up and they call crash simultaneously. any more thoughts?

  • raj somaiya
    raj somaiya Jun 04, 2010

    Did you got your car scanned for any error code.At www.autozone.com there is free car scanning.So once you get the error code it will be very easy to locate the faulty parts.As you have replaced most of the possible part.Many a times its a short circuit problem in the wires connected between the parts which leads to overheating.So getting the car scanned will be very much helpful in this problem.

    Thanks.

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All your problems seem to be generated by a lack of the electricity needed to power the electronics of the malfunctioning devices.  Most likely some wires got overheated and they shorted. 
This is a very serious problem, wire shorts is the first cause, and by far, for car fires. The first thing you should do is to start checking if power is coming to the speedo thru the wire loom behind the dash, then the tranny and finally the ABS unit. Once you will be sure of the general location of the fault you will gonna have to dismantle the wire loom and find the melted wires.

Posted on Jun 04, 2010

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  • jnero402 Jun 04, 2010

    ok that sounds logical, thanks a lot!

  • Azrael SRL Jun 04, 2010

    In that case would you rate my answer as helpful?


  • jnero402 Jun 04, 2010

    how do i rate it?

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  • Master
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You might have blown the transmission control module, not the ecm, you don't have any problems with your engine, is ABS still acting funny? I would go for sensors first and check them out before going for any other conclusion. Have a look at it and let me know if you need more advice. Best

Posted on Jun 04, 2010

  • 4 more comments 
  • jnero402 Jun 04, 2010

    see thats the thing, i thought that as well, but when I first drive the car, its fine but as soon as it warms up, all three fail simultaneously.

  • omaromid
    omaromid Jun 04, 2010

    I know it sounds odd but I would check the output of the alternator and make sure the charge controller works fine and alternator is not overloading the system.

  • jnero402 Jun 04, 2010

    really? how do i check that?

  • omaromid
    omaromid Jun 04, 2010

    Check the voltage going to the battery with the engine on, it should be around 13-14 volts up or down.

  • jnero402 Jun 04, 2010

    ok thanks!

  • omaromid
    omaromid Jun 04, 2010

    My pleasure!

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If you have a Body Control module in this Tahoe replace that too. Some models have this if equipt. It sounds like the BCM has a short in it causing all your problems in the cluster unit

Posted on Jun 04, 2010

  • jnero402 Jun 04, 2010

    is that right, where would i find the bcm?

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I don;t know who pointed you to the ECM but they should have talked to you about either the Starter relay, or the ignition relay. These both would cause this problem with your vehicle. The nice thing is that you can actually test both of these with a multimeter and figure out which one is bad before you start just changing them. Or you can just change both of them for about 50 dollars more.

Posted on Jun 04, 2010

  • jnero402 Jun 04, 2010

    really? wow ok thanks

  • Jeremy Reddick
    Jeremy Reddick Jun 04, 2010

    Really wow you are welcome. Dont ask a question if you already think you know what you are doing or talking about. You have already spent WAY more money then you should have Think about it hot rod

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