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The mkiv Supra Owners Club

Ecu problem maybe


Paul372

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I had a problem with my auto box where it just kept slipping when putting the power down as the clutch packs had gone so I swapped it over with a uk spec auto box with new filter and oil and also fitted a titan 3200 high stall. Supe drove absolutely fine but I had some lights flashing on the dash. The overdrive and slip con lights are flashing alternately to each over and the main triangle light is very faintly on. Then the overdrive bottom stopped working as in it doesn’t pick up the revs now, the car still drives fine but now it won’t let me put any power down it’s like it’s in some kind of limp mode, seems like an electrical problem, any ideas or do you think the ecu is playing up thanks 

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On 4/14/2024 at 9:15 AM, Paul372 said:

I had a problem with my auto box where it just kept slipping when putting the power down as the clutch packs had gone so I swapped it over with a uk spec auto box with new filter and oil and also fitted a titan 3200 high stall. Supe drove absolutely fine but I had some lights flashing on the dash. The overdrive and slip con lights are flashing alternately to each over and the main triangle light is very faintly on. Then the overdrive bottom stopped working as in it doesn’t pick up the revs now, the car still drives fine but now it won’t let me put any power down it’s like it’s in some kind of limp mode, seems like an electrical problem, any ideas or do you think the ecu is playing up thanks 

What error code are you seeing? Code 53 by any chance?

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  • 2 weeks later...
2 minutes ago, Paul372 said:

These are the lights showing on the dash when driving, slip control not working and overdrive doesn’t work

This is becoming quite common now. I know an owner that has tried swapping multiple ECU’s, traction ECU’s, speed sensor on the box, and still the problem persists. It must be something we are all missing for some reason. I thought it could be an abs error, but also apparantly not. So no idea what’s causing this problem for some owners. 

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I learned that dry solder joints on the odometer can cause the OD and Slip Cont lights to flash with no error codes. I resoldered mine and the problem went away. Cruise control not working and/or the auto box hunting for gears or changing erratically can also be symptoms caused by dry solder in the same area, but I’m not sure whether they could cause the limp mode you’re experiencing. Some of the wires to the odo do connect with the speed sensor though. Could be worth a look. 

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I did read on here that possibility could be the speedo converter, might be worth a shot changing it, so i thought I’ll check it out, doesn’t look the best installation and unsure what brand was used 

 

IMG_8462.jpeg

IMG_8463.jpeg

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  • 1 month later...

Update, I took the ecu out and found a couple of capacitors had blown / leaked so I sent off the ecu for repair had all the capacitors changed. It has fixed most of the problems, overdrive now working, auto box now back to normal with changing up and down gear and powers back but I still have the overdrive light flashing and slip con light on. 

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If the trac motor or TPS aren’t right, it’ll upset the OD and Trac lights. It operates the traction control and will activate during gearchanges - The OD light I believe is the only transmission fault light. Count the flashes.

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