Dave Posted May 10, 2018 Share Posted May 10, 2018 That's a "6 Million Dollar Question"! Many before you have asked this same question, however, either many of these have learned to live with it, or have been waaay too ignorant to post up the fix? This link https://www.google.co.uk/search?q=Toyota+Supra+fault+code+89&rlz=1C1CHBF_en-GBGB703GB703&oq=Toyota+Supra+fault+code+89&aqs=chrome..69i57.5026j0j7&sourceid=chrome&ie=UTF-8 Will take you to links for several different possible error 89 fixes including; Odo swap Delimiter/speed-converter &/or it's wiring Loom fault TPS setting Traction-Control stepper-motor operation A speed-sensor Auto to manual conversion result Traction Control ECU Engine or/& Transmission ECU. Please post up which one worked for you? Thank you. Mine was the capacitor on the ecu board ,got it repaired been good since Quote Link to comment Share on other sites More sharing options...
David P Posted May 11, 2018 Share Posted May 11, 2018 (edited) Result There should be a new sticky thread, 'Is your autobox misbehaving? overdrive issues? incorrect gear selection?' replace the ECU first!. I recall getting to the bottom of mine was like a month long childbirth. Nearly went manual! Any & all resolved "autobox" error-code threads are "stickied" in the Transmission Group here. http://www.mkivsupra.net/vbb/group.php?discussionid=184&do=discuss Edited May 11, 2018 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 11, 2018 Share Posted May 11, 2018 See my post 22 So essentially I just need to find a guy used to dealing with this sort of circuit board on a daily basis, will ask around Quote Link to comment Share on other sites More sharing options...
mattdavies Posted May 11, 2018 Share Posted May 11, 2018 I had the exact same problem spoke to Davidp who told me to swap the ecu ,couldn’t find a swap so took the ecu out and when I looked inside one of the capicitor had burst leaked on to the board ,got it repaired at my local tv repair guy and it’s been great ever since ,and it only cost me a tenner. Was it obvious when you opened up the ECU ? I am having a problem where my box wont change down to first in Manu mode ( all the lights work ) I have lived with it for nearly a year, but now I think second is starting to do it. Quote Link to comment Share on other sites More sharing options...
and1c Posted May 11, 2018 Share Posted May 11, 2018 Was it obvious when you opened up the ECU ? I am having a problem where my box wont change down to first in Manu mode ( all the lights work ) I have lived with it for nearly a year, but now I think second is starting to do it. get the capacitors replaced. Driftmotion offer a service for this but its in the US. https://www.driftmotion.com/2JZ-ECU-Cap-Service-p/dm2861.htm I am thinking of selling my car due to time constraints and not getting to drive it much at all but I am going to replace the caps on a spare ECU regardless and will post up a guide of what I used. Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 11, 2018 Share Posted May 11, 2018 A guide would be great...... I've emailed a couple of local companies to see what they can/will do/charge. Quote Link to comment Share on other sites More sharing options...
Dave Posted May 11, 2018 Share Posted May 11, 2018 (edited) Was it obvious when you opened up the ECU ? I am having a problem where my box wont change down to first in Manu mode ( all the lights work ) I have lived with it for nearly a year, but now I think second is starting to do it. Yes saw it straight away http://www.mkivsupra.net/vbb/showthread.php?343555-ECU-capacitor-leaking-FIXED-UPDATE&highlight=Capacitor Edited May 11, 2018 by Dave (see edit history) Quote Link to comment Share on other sites More sharing options...
mattdavies Posted May 11, 2018 Share Posted May 11, 2018 Yes saw it straight away http://www.mkivsupra.net/vbb/showthread.php?343555-ECU-capacitor-leaking-FIXED-UPDATE&highlight=Capacitor Thank you, Might have a look in mine then Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 13, 2018 Share Posted May 13, 2018 Yes saw it straight away http://www.mkivsupra.net/vbb/showthread.php?343555-ECU-capacitor-leaking-FIXED-UPDATE&highlight=Capacitor Whipped mine apart today and can see nothing untoward, now I'm not familiar with circuit boards but it's just a case of looking for something out of the ordinary, which I can't see!? Quote Link to comment Share on other sites More sharing options...
and1c Posted May 13, 2018 Share Posted May 13, 2018 There was nothing visible on mine either. I'm guessing it was internal breakdown and hadn't got to the stage of complete meltage. Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 13, 2018 Share Posted May 13, 2018 There was nothing visible on mine either. I'm guessing it was internal breakdown and hadn't got to the stage of complete meltage. Ah ok I thought they all 'browned up' like the photo posted. Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 14, 2018 Share Posted May 14, 2018 ok made a couple of spectulative enquiries and am going to send the duff ecu to these guys who got back to me and seem helpful, will let you know how it goes cost and effectiveness wise! http://www.asapelectronics.co.uk/services/pcb-repair Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 14, 2018 Author Share Posted May 14, 2018 I am glad that you guys found a solution for this. I will check my ecu. 4 gear works now, I don't know why. But O/D and slip control leds are blinking (O/D remains turn on if pressed) Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 30, 2018 Share Posted May 30, 2018 ok made a couple of spectulative enquiries and am going to send the duff ecu to these guys who got back to me and seem helpful, will let you know how it goes cost and effectiveness wise! http://www.asapelectronics.co.uk/services/pcb-repair Ok well they couldn't find anything wrong on inspection, did offer a full board resolder for £70 or they would just send it back, so at present I just had them send it back. So I could try another company or have a resolder done, I just wasn't sure if this was likely to be successful or more of a 'punt' and as the ecu works to a point (ie in an emergency) and my spare is working fine right now there is no urgency. Sort of in limbo, might try a very local guy that I can drop it off to for a second attempt. Quote Link to comment Share on other sites More sharing options...
Dave Posted August 31, 2018 Share Posted August 31, 2018 Mines gone again pulled the ecu and I think the capictor that was replaced has failed internally ,going to get it redone next week . Problem is No 4th gear . Quote Link to comment Share on other sites More sharing options...
and1c Posted August 31, 2018 Share Posted August 31, 2018 I still haven't got around to doing mine or making a guide unfortunately. I do recall that the capacitors are a very specific model and type though, maybe the incorrect one was used, or there is a referred fault causing a repeated failure. Quote Link to comment Share on other sites More sharing options...
auzzam Posted August 31, 2018 Share Posted August 31, 2018 May not be related, but I had a similar issue it was the error code that points to the gearbox sensor, turned out that I had to do the odo-fix and then it started shifting as normal. Does your cruise control and power steering function as expected once the warning light comes on? Quote Link to comment Share on other sites More sharing options...
Mk4Gaz Posted August 31, 2018 Share Posted August 31, 2018 I know it's been a while, but to update on the same issue I was suffering with..... I bought a spare ecu, plugged it in, and all back working as it should be [emoji106] Quote Link to comment Share on other sites More sharing options...
meister_raul Posted April 10, 2020 Author Share Posted April 10, 2020 So you had the same problem and a "new" ecu did the job? Quote Link to comment Share on other sites More sharing options...
k222bye Posted August 11, 2020 Share Posted August 11, 2020 Hi all. I have had similar issues as described by OP. Caps in my Auto ECU and traction CONTROL ECU have both leaked. I am re soldering high current capacitors and replacing them so will let you if this solved anything. Cap ratings provided below for 7 caps in auto ecu for reference if anyone is interested or finds this useful in future. 100 mf 10v x2 220 mf 10v x1 47mf 63v x2 10mf 50v x2 Quote Link to comment Share on other sites More sharing options...
mattdavies Posted August 11, 2020 Share Posted August 11, 2020 Hi all. I have had similar issues as described by OP. Caps in my Auto ECU and traction CONTROL ECU have both leaked. I am re soldering high current capacitors and replacing them so will let you if this solved anything. Cap ratings provided below for 7 caps in auto ecu for reference if anyone is interested or finds this useful in future. 100 mf 10v x2 220 mf 10v x1 47mf 63v x2 10mf 50v x2 Let us know how you get on Quote Link to comment Share on other sites More sharing options...
k222bye Posted August 11, 2020 Share Posted August 11, 2020 Hi all. I have had similar issues as described by OP. Caps in my Auto ECU and traction CONTROL ECU have both leaked. I am re soldering high current capacitors and replacing them so will let you if this solved anything. Cap ratings provided below for 7 caps in auto ecu for reference if anyone is interested or finds this useful in future. 100 mf 10v x2 220 mf 10v x1 47mf 63v x2 10mf 50v x2 So the absolute correct cap requirements for an Auto TT Supra are as follows : Auto ecu All caps are Nichicon high current capacitors (can be found on Farnell or DIGI key) 100 mf 10v x2 220 mf 10v x1 47mf 63v x2 10mf 50v x2 15mf x 35v (this one is on the second board that folds outwards) Traction ECU 47mf 63v 330mf 35v 100mf 10v 220mf 16v 820mf 35v 10mf 50v Total for these came to around £7 but direct shipping was 15 lol. Will post pictures during the soldering as well as what I used to make it easy. Quote Link to comment Share on other sites More sharing options...
k222bye Posted August 11, 2020 Share Posted August 11, 2020 Let us know how you get on Will do mate Quote Link to comment Share on other sites More sharing options...
k222bye Posted September 4, 2020 Share Posted September 4, 2020 Will do mate Update all. After extensive trouble shooting it turns out one cap leaked so badly it actually damaged through multiple layers of the Pcb. And despite replacing all caps and even attempting to repair the multi layer damage, i get an error code 31 when putting the ECU back in the car. So the car starts, and runs but runs really rough. I have tried to rebuild traces with copper and checked wiring at the ECU too but still get the error 31 ECU code. I successfully repaired the traction ECU, no problems with that as it tested OK in a friend's Auto TT, but sadly appears the ECU is a write off. FYI, removing the caps accelerated the damage to the eyelet hole but that was inevitable anyway as the components and PCB seemed to crumble away. Quote Link to comment Share on other sites More sharing options...
David P Posted September 4, 2020 Share Posted September 4, 2020 Thank you for resolving your technical thread. For the benefit of others, I have added this to the Transmission Group's collection of disgracefully few threads that have been resolved. Quote Link to comment Share on other sites More sharing options...
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