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Weird as hell issue...

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  • #1

    Weird as hell issue...

    I am going to do my best to describe this situation as it doesn't really make sense even to me. There are 2 problems that seem to be semi co-related so after replacing pieces I am turning to you guys for some advice.

    Problem #1
    My 4WD drive light comes on at random. Seems to be no pattern to how this light functions, when I go to look for the problem it goes off, when I want to enjoy a non-broken vehicle it comes on.

    So how do I check the 4wd faults? How do I figure out what this light is trying to tell me?

    Problem #2
    I will be driving somewhere and out of the blue my car starts to chunk. Pedal to the floor and throttle will cut in and out, mind you this problem can happen (and has happened) anywhere in the throttle range. It feels like the car dies, but it chunks in and out, seems to be the worst at 3000RPM in the first 3 gears.
    Now I have logged this on my ECU and the problem appears to be a bunk TPS, but I figure that should make my car drive funny all the time? The ECU is also giving me a fault code saying the An V3 (TPS voltage) above error high value. I don't know what the TPS voltage should be, but it gives this error all the time and the problem only happens some of the time. Have replaced the TPS twice

    In addition to this, the 4WD drive light seems to correlate to the severity of the chunk...

    So lost, help a brother out
    Originally posted by archaeic_bloke
    hows the warp drive? i've seen far too many GTR's lately that just arent able to hit warp speed.
    Tags: None
  • #2
    Disconnect your TPS, and hook up an ohmmeter from the reference voltage wire connection to the signal out wire connection. Then do a throttle sweep test, by slowly/smoothly turning the sensor input across it's full range. The resistance through the sensor should smoothly rise/decrease as you do this. If there are any hangups or glitches in the ohmmeter reading, then your TPS is likely shot.

    If all is well there, then hook it back up. Back probe with a voltmeter from the TPS signal out wire where it connects at the PCM and put the ground side of the voltmeter at battery -tive. With KOEO check the signal voltage, make sure it does a full sweep as well. If not, you have a short in the signal wire, that is either grounding it out before it gets to the PCM, or it is receiving voltage from another source and is obviously giving false information to the PCM.

    The "out of range" term in regards to codes is usually an issue with electrical shorts. The sensors usually provide a signal of for example 0 - 5 volts, but the PCM is programmed to have a deadzone on either end. This means the computer will only recognize .3 - 4.7 volts. If the signal it gets is in either deadzone, the PCM will set an "out of range" code. Keep that in mind when you are testing.

    Not sure what you mean by a "chunk" noise though. Where does it seem to come from?

    Hope that helps!

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    • #3
      Start with checking the fluid lid under the hood on the power steering if it is frayed at all where the wires go in that is most likely the problem and sounds like bad mafs

      Comment

      • #4
        TPS overvoltage seems to be what is causing it so far from what I can gather from the ECU logs. The 4WD light is the light that comes on when TPS is out of range so that why it was on
        Originally posted by archaeic_bloke
        hows the warp drive? i've seen far too many GTR's lately that just arent able to hit warp speed.

        Comment

        • #5
          Not sure if it helps but I noted when my alternator died the 4WD light came on. If you suspect a voltage issue might be worth looking into. Whats the guage say when the problem is happening?
          2015 Audi RS7 Sepang Blue
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          • #6
            Originally posted by Joker View Post
            Not sure if it helps but I noted when my alternator died the 4WD light came on. If you suspect a voltage issue might be worth looking into. Whats the guage say when the problem is happening?
            I've never even thought to look at that, I just had the darn thing rebuilt. But thank you I will have to check that out
            Originally posted by archaeic_bloke
            hows the warp drive? i've seen far too many GTR's lately that just arent able to hit warp speed.

            Comment

            • #7
              Ok... extra weirdness to my problem.

              So the TPS has a range that it doesn't read in... But only when the car is running? The TPS is killer accurate and reads from top to floor when the car is only aux powered on, when the car is running the pedal doesn't read anything till past about 3000rpm but by then the car is chunking cause its mix is off.

              What in the name of Zeus could this mean?
              Originally posted by archaeic_bloke
              hows the warp drive? i've seen far too many GTR's lately that just arent able to hit warp speed.

              Comment

              • #8
                could be as simple as a loose connector or old TPS sensor that gets faulty when it gets hot? see if you can borrow one from someone and try it out.
                Check out my RB30 build at
                http://forums.gtrcanada.com/gt-r-pro...b30-build.html

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                • #9
                  Going up to the shop I will let everyone know what caused this mess
                  Originally posted by archaeic_bloke
                  hows the warp drive? i've seen far too many GTR's lately that just arent able to hit warp speed.

                  Comment

                  • #10
                    Originally posted by hozer View Post
                    Ok... extra weirdness to my problem.

                    So the TPS has a range that it doesn't read in... But only when the car is running? The TPS is killer accurate and reads from top to floor when the car is only aux powered on, when the car is running the pedal doesn't read anything till past about 3000rpm but by then the car is chunking cause its mix is off.

                    What in the name of Zeus could this mean?
                    Sorry I didn't see this earlier... This indicates that you are getting a short to a power supply that is only active when the car is running. Hope that helps!

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