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Speedometer issue - abs problem!? No VSS on transfer case

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  • Speedometer issue - abs problem!? No VSS on transfer case

    Hi,

    I've had an issue with my speedo not working for a while. I've spent a $500 at 2 different auto electricians who couldn't diagnose the problem. Hopefully here can help. I have a 2002 prado 95 3.4l auto petrol with the active traction control.

    The fault code is Po500 obd2 complaint. Vehicle speed sensor circuit. No speedo working, handbrake light always on, abs and traction control light with all 4 wheels lit up suggesting that the abs and trc are disabled all the time.

    The OD light flashes and engine warning light comes on after starting to drive.

    This car doesnt have the VSS on the transfer case like other models and we assume the speed is picked up through the abs wheel speed sensors. Nobody can find the fault. All the abs sensors have been tested and are producing voltage with all the same resistance.

    All the wiring diagrams suggest it has a VSS attached to the transfer case and we cannot find the correct wiring diagrams for this model.

    Does anybody have the correct wiring diagrams or can suggest if there is a speedo sensor attached to a part of the car we cannot find. I'm out of options now as 2 recommended auto electricians are stumped too so maybe someone here can help!?

    We are about to drive to the cape and are on dual fuel so I would love to fix this problem asap to help with our fuel management.

    Thanks

  • #2
    If you have no luck fixing before trip a cheap GPS will give you speed and distance for about $100+ or put an app on your phone. Wont solve the lights problem and abs etc tho.

    Comment


    • #3
      The wheel speed sensors need to be scoped for the correct waveform. Has anyone removed them and checked for metallic contamination on them?
      Silver '04 KZJ120~Manual~GXL~Dobinson/Kings lift~Custom valved Ironmans~Detroit Locker~Endless Air~X9 Superwinch~Madman EMS1~TJM Dual Battery~Rhino Roof Tray~120W solar panel~Foxwing awning~Bushskinz UVP~Long Ranger water tank~Bushman fridge~Steinbauer P-Box~Beaudesert 2 3/4"~Airtec Snorkel~TJM Sliders~Prico Boost Gauge~BFG-KO2s~TPMS~GME TX3420~Front and Rear Cameras~Ultimate Camper hanging off the back!

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      • #4
        Thanks, yeah gps is our last option but we have considered it.

        The wheel speed sensors have been removed and cleaned according to the auto electrician. Not sure he checked the waveform but he said he got the same voltage and resistance off each sensor which was around 400mv from memory.

        As he cannot find the correct manual/wiring diagram I'm not sure he know what the exact specifications where he is testing for.

        Do you guys think it would likely be the abs sensors causing the issue?

        Comment


        • #5
          Im having the exact same issue.
          I have checked all ABS sensors and all okay. all fuse's etc all good. anyone had any luck solving this issue?

          Cheers
          Josh

          Comment


          • #6
            Hey Mate,

            So im having the exact same issue. EXACT. only difference is i do have a VSS on the transfer case. i will attach a image of the location of it.

            Are you sure yours doesn't have one? when i drive the engine light comes on, i have plugged in to techstream and it says its a fault with the VSS but i dont think its the issue. i have checked the sensor and appears to be working just like all the ABS wheel speed sensors. Techstream however wont read the ABS ECU, and the toyota dealer cant read it either so may be a wiring issue.

            i have a 2000 model prado 3.4 petrol.

            What i have done so far

            - checked all fuse's and relays - all okay

            - checked ABS wheel sensors - all okayÂ

            - checked VSS - all okayÂ

            - checked master cylinder - appears all okay

            - replaced ECU - due to immobiliser issue - no change after ECU change.Â


            Next steps are to check the wiring to the ABS/TRC ECU.

            Please let me know if you get anywhere with your troubleshooting.


            Here are some info on the wiring diagrams you're potentially after, in both the early and late 95 series diagram both show VSS



            Click image for larger version

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            • #7
              Hi all. Thought I’d share my resolution.
              I bought a second hand abs/trc ECU (super difficult to source)
              and that resolved the fault!
              yewwww

              Comment

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