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  • Accidentally reversed the battery polarity….

    G’day everyone, I actually haven’t been on here in a while, too many reliable klms!
    I purchased a 2002 3.4l GXL auto for spare parts for my 2000 model 3.4l auto Grande. This car was already a spare parts car for someone else so is not 100% complete.
    Even though the front of the engine isn’t complete, missing the clutch fan, alternator and serpentine belt etc, it would still start and drive facilitating moving it around.
    However on the first day I went to put a battery in it and didn’t notice someone had replaced the negative cable with a red insulated cable (Why!!!?). I initially reversed the polarity on the battery, thinking red is positive. The headlights came on, as did the wipers. I simply thought they had been left on so proceeded to try starting it. After it wouldn’t, I looked at the battery and saw my error.
    I know the engine did run as the tow truck bloke drove it into my driveway. Now it won’t. I have checked all the fuses and relays I could find relating to the EFI or ignition I could find. I can only assume now (unless someone knows different?), that I have fried the ECU? I removed it and took it to my 2000 model, though it wouldn’t start it as I am guessing the immobiliser stopped it? Or it is indeed fried. How hard is it to reprogramme an ECU to another car? Can it be done with an OBD2? Or does anyone have any other suggestions on what could be the issue now, other than the ECU? I would have thought it would have been protected against a polarity mishap?

    Cheers

    Adrian

  • #2
    Check the starter motor first. Reversing polarity on the battery during a jump start can fry the starter motor I’ve heard. You’ll need to have it bench tested as being the faulty component.
    2005 120 series V6 Grande, 2 inch susp lift (King/EFS combo), 32 inch MT’s, Safari Snorkel, rear diff lock, breathers, Light Force spotlights, UHF, dual batteries.

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    • #3
      Cant say for a Prado, but I fixed a FG ford that the owner did the same. The Main fuse went, as did the fuses for the radio. I would be looking over the main fuses, plus check the alternator as the diode bridge can be shorted by reverse polarity.

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      • #4
        From what I've read, it does seem like the ECU may have been fried. Reprogramming an ECU to another car can be a bit tricky, but it's not impossible. However, it may be easier and more cost-effective to try to find a replacement ECU for your 2002 GXL. As for the issue with your 2000 Grande, it's possible that the immobilizer may have stopped it, but it's hard to say for sure without further testing. Definitely check the main fuses and the alternator diode bridge, as suggested by others on the forum. And if you need any spare parts, you could always try looking for them at pick and pull car services.
        egmonton
        Lurker
        Last edited by egmonton; 03-03-2023, 03:03 AM.

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        • #5
          Check your ALT 120/140A fuse 37 in the engine bay (Fuse Box Diagram Toyota Land Cruiser Prado (2002-2009) (fuse-box.info)) as this is designed to protect the alternator diodes from reverse polarity connection of the battery and feeds lots of the other fuses..

          The ECUs should have some sort of reverse polarity. protection i.e fuse or internal protection. Also, the Big W Catalogue may offer what you are looking for.

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          • #6
            Hello again, thanks to everyone who has responded to my post. After removing the ECU, I towed the vehicle out of the way and didn’t have time to get back to it. Am now reviving this post as I have had the ECU tested and all seems O.K. and would like to move the car under its own steam. I don’t know why I didn’t check this initially, though now after refitting the ECU I sprayed some Aerostart into the throttle body and it fires . Also I don’t hear the fuel pump prime when initially turning on the ignition. I can’t see a relay or fuse specifically mentioning “Fuel Pump”. Can anyone point me in the right direction?
            Cheers
            Adrian

            Comment


            • #7
              Hello again, thanks to everyone who has responded to my post. After removing the ECU, I towed the vehicle out of the way and didn’t have time to get back to it. Am now reviving this post as I have had the ECU tested and all seems O.K. and would like to move the car under its own steam. I don’t know why I didn’t check this initially, though now after refitting the ECU I sprayed some Aerostart into the throttle body and it fires . Also I don’t hear the fuel pump prime when initially turning on the ignition. I can’t see a relay or fuse specifically mentioning “Fuel Pump”. Can anyone point me in the right direction?
              Cheers
              Adrian

              Comment


              • #8
                maybe fues 3 or relay 1?
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