ECU interchange ?
10-22-15, 12:17 PM
#16
I suppose the connectors would be a good indication of whether the ecu would work in said car or not. If Lexus was going to not have newer ones downward compatible then why not make it idiot proof and use different connectors. So are the connectors different from a Trac ecu versus a non trac ecu?
The SC400 ECU connectors are of a type very similar to the 2JZ ecu connectors (supra and sc300). I have no idea what those are either. I'd do the same thing and just RE them but I don't have an SC400 and its not an urgent matter.
10-22-15, 12:22 PM
#17
Lead Lap
Thread Starter
You made a breakout box of sorts then? I was just wondering if a connector would be different from a trac box to a non trac box. I know yours is from a certain year car. So are you 3D printing them? You ought sell them to others looking to do what you wanted to do. So did you make the male and female?
10-22-15, 01:36 PM
#18
You made a breakout box of sorts then? I was just wondering if a connector would be different from a trac box to a non trac box. I know yours is from a certain year car. So are you 3D printing them? You ought sell them to others looking to do what you wanted to do. So did you make the male and female?
The mystery connector, well I have no idea.
I'm leary of selling anything in a manner you suggest because such designs could have IP issues, I'm not in that business. I just RE'd to support my own equipment, which is perfectly legal for me to do (just like working on your own car, reflow soldering crappy ICs on an XBOX, etc etc etc)
You don't need fancy equipment to dupilicate broken or unavailable parts to support your expensive equipment. Sculpey clay and a cheap pantograph are all you need really. DIY,KISS
10-23-15, 04:16 PM
#19
Lead Lap
Thread Starter
I need to know what is different between these 2 ECU's.
89661-50020 and 89661-50042 and don't mention dates, I mean electrically or what ever with in the boxes.
They both have the same number for the ABS Ecu. So is there anything other than date that makes them different?
89661-50020 and 89661-50042 and don't mention dates, I mean electrically or what ever with in the boxes.
They both have the same number for the ABS Ecu. So is there anything other than date that makes them different?
10-24-15, 04:00 AM
#20
The one that I know of is AMP Multilock 40/70 of a specific part I don't recall offhand but it's common on other ECUs, especially Hondas.
The mystery connector, well I have no idea.
I'm leary of selling anything in a manner you suggest because such designs could have IP issues, I'm not in that business. I just RE'd to support my own equipment, which is perfectly legal for me to do (just like working on your own car, reflow soldering crappy ICs on an XBOX, etc etc etc)
You don't need fancy equipment to dupilicate broken or unavailable parts to support your expensive equipment. Sculpey clay and a cheap pantograph are all you need really. DIY,KISS
The mystery connector, well I have no idea.
I'm leary of selling anything in a manner you suggest because such designs could have IP issues, I'm not in that business. I just RE'd to support my own equipment, which is perfectly legal for me to do (just like working on your own car, reflow soldering crappy ICs on an XBOX, etc etc etc)
You don't need fancy equipment to dupilicate broken or unavailable parts to support your expensive equipment. Sculpey clay and a cheap pantograph are all you need really. DIY,KISS
10-24-15, 07:21 AM
#22
Moderator
I'd simply fix the original ECU if the original were failed. That's much quicker and easier than to do the analysis of those 2 all by myself. Those who aren't comfortable to fix can purchase a correct and working used one. There's no immobiliser system installed in early models and it's an easy job.
Or just try using the different year one at your own risk like I have tried for a 95 and a 96 after comparing all the pin-outs and parts except the software but it was quite time consuming efforts to complete though.
10-24-15, 12:23 PM
#23
Lead Lap
Thread Starter
Pin outs are the same, cars and all stuff electrical is the same, engines and sensors the same, I might try it just to see. I will fix the original, unless of course its an IC or something like that. Its just nice to know if the newer ECU would work. I think it will, and there is probably a program change that is the difference. There could also be circuit updates.
10-30-15, 04:45 PM
#24
Lead Lap
Thread Starter
I tried it. The 50042 unit would not let the 1990 start, and yeah I don't know if it is a good unit or not.
The way the engine sounded was it was advanced too far, as it did a bad kick back when the 2 attempts were tried. I had checked visually both the unit out of the car and this new to me one I tried for leaky caps, both look just fine, and I know it doesn't mean much but !
Anyway it started right up with the original ecu and after a 12 minute warm up I died once, started up and ran and idled okay, after shutting down did a code check and got 31 airmeter. I wonder what goofed it up?
The internals of both looked the same.
The way the engine sounded was it was advanced too far, as it did a bad kick back when the 2 attempts were tried. I had checked visually both the unit out of the car and this new to me one I tried for leaky caps, both look just fine, and I know it doesn't mean much but !
Anyway it started right up with the original ecu and after a 12 minute warm up I died once, started up and ran and idled okay, after shutting down did a code check and got 31 airmeter. I wonder what goofed it up?
The internals of both looked the same.
Last edited by dicer; 10-30-15 at 05:14 PM. Reason: More stuff to add
10-31-15, 05:29 PM
#25
Moderator
Don't be discouraged, dicer. He who makes no mistakes makes nothing. Failure teaches success. May be you should have tried a known good one. But still it had a risk.
I respect those who open a door to the new world. In the past, some have succeeded but many have failed due to the lack of preparations or some unexpected accidents.
A little knowledge or lack of information is a dangerous thing. I myself have failed many many times but there were some big success. Those losses were all compensated though. I even got some extra fringe benefits from those. Most of my patents were all resulted from repetitions of failures.
I respect those who open a door to the new world. In the past, some have succeeded but many have failed due to the lack of preparations or some unexpected accidents.
A little knowledge or lack of information is a dangerous thing. I myself have failed many many times but there were some big success. Those losses were all compensated though. I even got some extra fringe benefits from those. Most of my patents were all resulted from repetitions of failures.
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11-02-15, 06:22 PM
#26
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Don't be discouraged, dicer. He who makes no mistakes makes nothing. Failure teaches success. May be you should have tried a known good one. But still it had a risk.
I respect those who open a door to the new world. In the past, some have succeeded but many have failed due to the lack of preparations or some unexpected accidents.
A little knowledge or lack of information is a dangerous thing. I myself have failed many many times but there were some big success. Those losses were all compensated though. I even got some extra fringe benefits from those. Most of my patents were all resulted from repetitions of failures.
I respect those who open a door to the new world. In the past, some have succeeded but many have failed due to the lack of preparations or some unexpected accidents.
A little knowledge or lack of information is a dangerous thing. I myself have failed many many times but there were some big success. Those losses were all compensated though. I even got some extra fringe benefits from those. Most of my patents were all resulted from repetitions of failures.
11-26-15, 05:37 PM
#27
halt
There always were minor changes. Regarding the compatibility between different year models, Toyota/Lexus would clearly say, No. They'd say, "Use the same one except the one explained in the TIB".
Those who use a different ECU may kill their car in the worst scenario. But sometimes it shows a good result like to use a 96 ECU to a 95 model. It often improves the engine halt problem after the long high speed run.
Those who use a different ECU may kill their car in the worst scenario. But sometimes it shows a good result like to use a 96 ECU to a 95 model. It often improves the engine halt problem after the long high speed run.
11-26-15, 07:34 PM
#28
Moderator
11-29-15, 05:31 PM
#29
Thanks for this topic, the part numbers are great for reference!
However, just to mention, I would personally avoid swapping a 1993 ECU for a 1992 ECU, and would only interchange 1990-1992 ECUs with each other or 1993-1994 ECUs with each other.
Correct me if I'm wrong, but if a 1993 ECU were to be replaced by a 1992 ECU, wouldn't new features, such as the passenger side airbag, become disabled, despite the same connectors?
However, just to mention, I would personally avoid swapping a 1993 ECU for a 1992 ECU, and would only interchange 1990-1992 ECUs with each other or 1993-1994 ECUs with each other.
Correct me if I'm wrong, but if a 1993 ECU were to be replaced by a 1992 ECU, wouldn't new features, such as the passenger side airbag, become disabled, despite the same connectors?
11-29-15, 06:31 PM
#30
Moderator
Thanks for this topic, the part numbers are great for reference!
However, just to mention, I would personally avoid swapping a 1993 ECU for a 1992 ECU, and would only interchange 1990-1992 ECUs with each other or 1993-1994 ECUs with each other.
Correct me if I'm wrong, but if a 1993 ECU were to be replaced by a 1992 ECU, wouldn't new features, such as the passenger side airbag, become disabled, despite the same connectors?
However, just to mention, I would personally avoid swapping a 1993 ECU for a 1992 ECU, and would only interchange 1990-1992 ECUs with each other or 1993-1994 ECUs with each other.
Correct me if I'm wrong, but if a 1993 ECU were to be replaced by a 1992 ECU, wouldn't new features, such as the passenger side airbag, become disabled, despite the same connectors?
You will see why not reading my earlier post. There are many other design changes that affect engine managements.