99' SC300 5-Speed Swap Question
06-11-13, 04:45 PM
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99' SC300 5-Speed Swap Question
Hey CL!
It's been awhile since I've posted (you know school and such)
But now I'm on break and ready to finally do the 5-speed swap on my SC that I've been dying to do since I first bought it in late 2011.
Anyway, I've done countless research on doing the swap and read that it is fairly easy to drop a R154 or W58 into my SC and not have any problems, well except for that damn CEL error.
Each thread I've gone through seems outdated and I can't find the answer that I want.
Has anyone found a solution to the dreaded OBD2 problem when making their 98-00 VVTi stick?
Have you been able to bypass the CEL without having to pay a *****-ton using a stand alone ECU?
I'd really appreciate the help guys, cause although I can just electric tape that light and be done with it, I'd rather go the safe route just in case I do trigger the CEL in the future and don't see it.
It's been awhile since I've posted (you know school and such)
But now I'm on break and ready to finally do the 5-speed swap on my SC that I've been dying to do since I first bought it in late 2011.
Anyway, I've done countless research on doing the swap and read that it is fairly easy to drop a R154 or W58 into my SC and not have any problems, well except for that damn CEL error.
Each thread I've gone through seems outdated and I can't find the answer that I want.
Has anyone found a solution to the dreaded OBD2 problem when making their 98-00 VVTi stick?
Have you been able to bypass the CEL without having to pay a *****-ton using a stand alone ECU?
I'd really appreciate the help guys, cause although I can just electric tape that light and be done with it, I'd rather go the safe route just in case I do trigger the CEL in the future and don't see it.
Last edited by Taken; 06-12-13 at 11:18 AM.
06-11-13, 05:27 PM
#2
I remember reading something about maybe using a manual IS ecu. As for it being a valid option for your specific case I don't know, but may be an avenue to look at. It does make sense, seeing as it's the same engine and is obd2 so it in theory should be able to communicate everything is happy through the obd2 port as long as everything is happy
06-11-13, 05:58 PM
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I have done one 98 sc300 but you have to remove the solenoid out of the auto trans and plug them in the trans harness.
Or
Use the is300 ecu if the pins are the same and reprogram your key.
Option 1 is easier! !
Or
Use the is300 ecu if the pins are the same and reprogram your key.
Option 1 is easier! !
06-11-13, 06:26 PM
#4
You need to look up Cartmill's threads regarding his '99 SC300 swap. As above, part of his solution involved the transmission solenoids being removed and tied up in the undercarriage so that the ECU got the signals it wanted.
That's the proven method. I would be curious if a '98 Supra MKIV 5-speed manual ECU would also do the trick since the cars are so similar. Then again, never having tried it, that's just a guess. The Cartmill solution is probably best and unlike the 98-00 SC300 cars, 98-00 SC400's have to use his fix in order to get rid of their CEL light with a manual.
That's the proven method. I would be curious if a '98 Supra MKIV 5-speed manual ECU would also do the trick since the cars are so similar. Then again, never having tried it, that's just a guess. The Cartmill solution is probably best and unlike the 98-00 SC300 cars, 98-00 SC400's have to use his fix in order to get rid of their CEL light with a manual.
06-11-13, 07:17 PM
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You need to look up Cartmill's threads regarding his '99 SC300 swap. As above, part of his solution involved the transmission solenoids being removed and tied up in the undercarriage so that the ECU got the signals it wanted.
That's the proven method. I would be curious if a '98 Supra MKIV 5-speed manual ECU would also do the trick since the cars are so similar. Then again, never having tried it, that's just a guess. The Cartmill solution is probably best and unlike the 98-00 SC300 cars, 98-00 SC400's have to use his fix in order to get rid of their CEL light with a manual.
That's the proven method. I would be curious if a '98 Supra MKIV 5-speed manual ECU would also do the trick since the cars are so similar. Then again, never having tried it, that's just a guess. The Cartmill solution is probably best and unlike the 98-00 SC300 cars, 98-00 SC400's have to use his fix in order to get rid of their CEL light with a manual.
06-11-13, 07:27 PM
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You can also see what communication the ECU requires from the TCU in order to trigger the CEL. It may just look for a simple resistance value, which states it's operating at proper capacity which can easily be fooled.
In BMW/Subaru world (Subaru would be closer, since it uses a related DENSO ecu unit--) They are able to cheat the CEL by grounding out (to body) the pins which the ECU uses to communicate w/ the TCU unit--
The other problem would be reverse, the lights won't go on.
In BMW/Subaru world (Subaru would be closer, since it uses a related DENSO ecu unit--) They are able to cheat the CEL by grounding out (to body) the pins which the ECU uses to communicate w/ the TCU unit--
The other problem would be reverse, the lights won't go on.
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06-11-13, 09:47 PM
#9
You can also see what communication the ECU requires from the TCU in order to trigger the CEL. It may just look for a simple resistance value, which states it's operating at proper capacity which can easily be fooled.
In BMW/Subaru world (Subaru would be closer, since it uses a related DENSO ecu unit--) They are able to cheat the CEL by grounding out (to body) the pins which the ECU uses to communicate w/ the TCU unit--
The other problem would be reverse, the lights won't go on.
In BMW/Subaru world (Subaru would be closer, since it uses a related DENSO ecu unit--) They are able to cheat the CEL by grounding out (to body) the pins which the ECU uses to communicate w/ the TCU unit--
The other problem would be reverse, the lights won't go on.
No, I haven't seen one specifically but they definitely had VVT for one year only. Now, finding a manual 98 Supra ECU might be difficult for the OP.
06-12-13, 11:03 AM
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06-12-13, 11:17 AM
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