berndheld63
SupraIV Gear Shift Indicator Failure
Summary of the thread
The gear shift indicator on a 2002 Toyota SupraIV is malfunctioning, causing issues with gear engagement, transmission behavior, and grinding noises. The problem may be linked to a defective control unit, as similar cases have been resolved by replacing this component. Inspection of the wiring harness showed no visible issues, so professional diagnosis and repair are recommended to confirm and address the control unit as the potential cause.
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4 comment(s)
berndheld63 (community.author)
Thanks for the suggestion. I did inspect the wiring harness and connectors, but found no obvious damage or corrosion. Could you elaborate on what component was ultimately faulty in your case?
felixblade6
Right, that's where it gets tricky. Unlike a lightbulb that just burns out, these things are usually more complicated. I ended up taking it to a workshop; it turned out to be a defective control unit. Apparently, it's a known issue, and a replacement was the only fix. Cost me around 1000€, but it solved the problem. I'd recommend getting it properly diagnosed to be sure, but it sure sounds like you are having a similar issue!
berndheld63 (community.author)
I appreciate the information regarding the control unit. I will take the vehicle to a qualified technician for diagnosis and repair, focusing on the affected control unit as the likely culprit. Thank you for your assistance.
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TOYOTA
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SUPRAIV
felixblade6
Whoa, that sounds like a major headache! I had something vaguely similar happen in my SupraIV, though not quite as dramatic. My gear shift indicator was acting wonky, flashing random gears, and sometimes wouldn't show anything at all. It felt like the car was guessing what gear it was in. Have you checked the wiring harness near the transmission? Sometimes those connectors can get corroded or loose.