ECM replacement ES300

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03-14-18, 09:18 AM

#31

wmj259

Intermediate

Join Date: Jan 2016

Location: Maryland

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Quote:

Originally Posted by wsrivers

I don't see any testing instructions from @tomf if someone could assist me with locating this it would be greatly appreciated. I can head over to Walmart to get a multimeter and hopefully resolve this issue. Thanks.

https://www.clublexus.com/forums/es-...olenoid-2.html
You will want to look at posts # 9,10,11,12, 23, and 24
Quick Note: You will want to open your glove compartment to do the tests, as it will help you test the connection from ECM to the Transmission at the same time.

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07-29-20, 05:47 PM

#32

69torino

Driver School Candidate

Join Date: Mar 2020

Location: GA

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Security module is separate?

Quote:

Originally Posted by mitmaks

I wouldn't think that theft protection would kick in as this is your OEM ECU. Our 96es300 has some theft protection/factory alarm (same one you're probably talking about) and once I put in ECU there were no alarms,etc whatsoever. Car has been running great ever since.

I was told when looking for a computer for my 95 that the security module is separate from the engine module. If true, it makes things much easier.