munkinutz

Hi Lance, been to the car today and still scratching my head... I have checked the throttle linkage and everything is exactly the same as yours. When tugging the cable it moves about half inch before moving the throttle. The car is idling at 1100 RPM and the throttle position is 16.7%. I have tried a different throttle body and nothing changes, still have same fault. I also got hold of another ECU from another IS200 and noticed a difference... Obviously the car wouldn't start as the key was not programmed but I noticed that the throttle operated properly on the replacement ECU. On the replacement ECU the throttle operated the same as this - (http://www. youtube.com/watch?v=hl4YsXjEGY4) http://www.youtube.com/watch?v=hl4YsXjEGY4 However when I use my original ECU the throttle body does not operate the same... If I twist the throttle (or push accelerator pedal), the "inner motorised" pulley wheel doesn't move at all unless I turn it manually. Would I be right in thinking that at this stage the fault is the ECU itself? I'm stumped now. Hope all of the above makes sense. Thanks again in advance.

Hi Lance, thanks for the picture... It is ideal! I will be going over to the car tomorrow so will give everything you have suggested a go. Thanks again for all your help, will report back tomorrow on how it goes.

Ok thanks for the info and the link to the manual. Looks like a worthwhile investment. I think your right... Will definitely investigate the linkage and cable. I don't suppose by any chance you have any pictures of what the linkage should look like. Would be handy to cross reference to see if anything is missing from my linkage. Thanks again Lance, your a true gent.

Hi Lance, Thanks again for the fast reply and thanks for the pdf. I will definitely have a look at the throttle body. The cable is quite loose and I have had to pull the throttle cable tighter on the engine. The cable looks to have gained around 35-45mm which is making it loose. I can't remember the exact idle speed (car is at a friends so can't check right now), but I vaguely remember it being around 830 rpm. I will check this for you though. Yes the throttle body moves when I press the peddle but only when I re-tension the cable. It used to be very responsive until the morning I came to the car and found the fault. Could I ask where you got the service manual from? The one I have is all jumbled up and all over the place making it difficult to read.

Hi Lance, thanks for your reply. I have read somewhere that several people have replaced the ECU and the fault still persists. I have been advised to check the Throttle Position Sensor but everything looks OK. I have noticed that the throttle cable is slightly loose, would this have anything to do with it? The cable never used to be slack.

Hi guys, new to the forum and the Lexus club... I am having an issue with my 1999 IS200. I bought the car around 2 weeks ago and everything was running smoothly up until a couple of days ago. I went to go out in the car and have lost acceleration, the engine management light is on, TCS light is flashing and my scantool is giving me error code P1633: ECM Malfunction (ETCS Circuit). I have tried clearing the code but as soon as I start the car the fault code comes back. I'm hoping someone can shed some light on what might be going wrong. Has anyone else had this problem and has anyone managed to solve the problem? I have googled for hours and hours but can't seem to find any kind of guide or information on how to solve this issue. I hope some one is able to help and apologise if this has been discussed in a previous thread.