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The mkiv Supra Owners Club

Electrical Gremlins after alternator change


Jamie698

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Stumped, alternator went and lit up my dash like a Christmas tree, installed another and it's seems to be charging fine getting 14.4v under idle and no flat battery yet so all good. However, I have the warning light indicator still illuminated red triangle one, have reset the ecu a couple of times, can't get a code out of the ecu via bridging with paper clip. Don't think it works on early supras just flashes the over drive light on key turn 2 like some other members have reported. Brake fluid fine and all doors closed, handbrake down too ;)

 

Should I have a fuse in ecu b slot in footwell, tried chucking one in and illuminates the headlights low beam iirc even with lights off?

 

Final symptom is that the traction control button has no effect, trc off does not illuminate?

 

Thoughts appreciated.

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Do you have an active spoiler? I had to unplug the active spoiler ecu to clear the triangle. Also try bridging with a decent bit of wire when checking for codes. I used a paper clip and got nothing but a code with wire. And drive around for 15 mins or so before checking and don't reset ecu before you do as you will wipe codes. Probly already know this but just thought I would make sure lol

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Tried speaker wire to try and get codes but no joy. Active spoiler is fine. So it's got to be this ecu-b circuit, abs, traction control are both on this fuse. When a put a new fuse in it doesn't blow but illuminates the headlights, I can't think what's blown to cross the two to put power to the headlights. Maybe time for an auto electrician :(

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Yeah Brake fluid is on the max line, tried disconnecting the fluid sensor as well, didn't change anything. ECU-B circuit im 99% sure now is the problem, just scratching my arse to where to start troubleshooting the circuit. I'll hopefully have time to tinker tonight.

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