98+ ECU replacement / programming?
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Lexus Test Driver
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98+ ECU replacement / programming?
anyone here replaced their 98+ ECU?
i have a problem with mine (triggering the EFI relay to stay on 24/7) and i need to replace it, but of course the new ECU won't be matched to my existing electronic KEYS.
Alldata shows only the procedure that involves the Lexus programming tool, which i don't have.
i saw a thread in which someone posted a procedure to program new KEYS to match your ECU, but do you do the same thing to reprogram the ECU to match the keys?
i have a problem with mine (triggering the EFI relay to stay on 24/7) and i need to replace it, but of course the new ECU won't be matched to my existing electronic KEYS.
Alldata shows only the procedure that involves the Lexus programming tool, which i don't have.
i saw a thread in which someone posted a procedure to program new KEYS to match your ECU, but do you do the same thing to reprogram the ECU to match the keys?
They are removable.
Yea. Im not. But I just looked at a 97 yesterday and there is an EPROM on the EMS ECU main board.
So the 98 should be too. If they are not oh well. You should at least open it up and look.
What I am saying is.. IF your certain its on the EMS ECU where the information is even stored? If so it MAY be the EPROM because it's the only EPROM (progammable chip) on there. So you can just get another one here on CL and swap chips. But like Stock said your EMS might just have a blown cap or something.
So the 98 should be too. If they are not oh well. You should at least open it up and look.
What I am saying is.. IF your certain its on the EMS ECU where the information is even stored? If so it MAY be the EPROM because it's the only EPROM (progammable chip) on there. So you can just get another one here on CL and swap chips. But like Stock said your EMS might just have a blown cap or something.
Last edited by lfrers; Mar 16, 2011 at 05:14 PM.
Thread Starter
Lexus Test Driver
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Joined: Dec 2007
Posts: 1,022
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From: Nashville, TN
i removed the ECU main circuit board from its case. there is no removable EPROM chip. i could also find no blown caps or anything that looked burnt on the circuit board.
the 98+ ECUs are totally different than the 97 and earlier.
the 98+ ECUs are totally different than the 97 and earlier.
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98, aristo, computer, ecm, ecu, engine, eprom, lexus, nashville, programmer, programming, replacement, replacing, reprogramming, tn
