beaudroix Posted September 20, 2009 Share Posted September 20, 2009 My 94 LS400 hesitates, almost shuts down and the engine light comes on when trying to accelarate over 2000 rpm's. The Toyota dealership first said the car was throwing codes for the Throttle Positioning Sensor, they replaced, car worked fine for one day then problem came back but the TPS codes went away. Then the codes for the IAC valve and the Mass Air Flow came up so Toyota relaced them, car worked for one day them problem came back but both codes went away. Finally Toyota said the ECM (car's computer) needed to be replaced because it was throwing wrong codes. I could not afford the Lexus ECM ($1,400) so I had Toyota remove the ECM, sent it to Auto & Truck Electronics (they specialize in rebuilding these ECM's), they rebuilt it, Toyota put it back in and again did fine for one day and started the problem again. I am begging for an answer here! Someone please help... Quote Link to comment Share on other sites More sharing options...
python Posted September 21, 2009 Share Posted September 21, 2009 1400! LMFAO! have ur local NAPA auto parts send it off to cardone and have it flashed...probably 250.00 Quote Link to comment Share on other sites More sharing options...
beaudroix Posted September 21, 2009 Author Share Posted September 21, 2009 1400! LMFAO! have ur local NAPA auto parts send it off to cardone and have it flashed...probably 250.00 Auto & Truck Electronics rebuilt the ECM for $99.00 plus a lifetime warranty but that has not fixed my problem... Quote Link to comment Share on other sites More sharing options...
python Posted September 21, 2009 Share Posted September 21, 2009 give exact codes,dont just say the iac code or tps code, reset ur ecu by taking out the efi fuse under the hood then drive it till the light comes on then retrieve the code(s) Quote Link to comment Share on other sites More sharing options...
beaudroix Posted September 27, 2009 Author Share Posted September 27, 2009 give exact codes,dont just say the iac code or tps code, reset ur ecu by taking out the efi fuse under the hood then drive it till the light comes on then retrieve the code(s) I disconnected the battery, nothing changed, problem still exists. Where can I find instructions on how to check codes? Quote Link to comment Share on other sites More sharing options...
amcdonal86 Posted September 28, 2009 Share Posted September 28, 2009 Take it to your local auto parts shop and have them scan it for you. Quote Link to comment Share on other sites More sharing options...
lexfourcam Posted September 29, 2009 Share Posted September 29, 2009 if you have 94 which it says you do, its obd1. they dont have these readers at the autozone. go on lexls.com and look up on how to read the codes. it can be done with a piece of wire, i used speaker wire. its a very helpful website. Quote Link to comment Share on other sites More sharing options...
Quack11 Posted September 29, 2009 Share Posted September 29, 2009 My 94 LS400 hesitates, almost shuts down and the engine light comes on when trying to accelarate over 2000 rpm's. The Toyota dealership first said the car was throwing codes for the Throttle Positioning Sensor, they replaced, car worked fine for one day then problem came back but the TPS codes went away. Then the codes for the IAC valve and the Mass Air Flow came up so Toyota relaced them, car worked for one day them problem came back but both codes went away. Finally Toyota said the ECM (car's computer) needed to be replaced because it was throwing wrong codes. I could not afford the Lexus ECM ($1,400) so I had Toyota remove the ECM, sent it to Auto & Truck Electronics (they specialize in rebuilding these ECM's), they rebuilt it, Toyota put it back in and again did fine for one day and started the problem again. I am begging for an answer here! Someone please help... I had similar problem with my 91 LS400 and after over two months of infrequent troubleshooting and headache, I changed the fuel pump and fuel pressure regulator and the problem was solved. Check the fuel delivery pressure with a gauge and see if you are having a fuel starvation problem. Good luck. Quote Link to comment Share on other sites More sharing options...
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