I have 98 lexus gs300 the engin and vsc lights are on, codes P1120, P1121. where to find and how to change accelerator positopn sensor?
Thank you in advanse!!!!
I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)
My symptons were:
VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).
During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would start...it happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.
The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from RockAuto.com (exacly same part toyota OEM)
THE PART THAT FIXED THE PROBLEM:
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"Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.
The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.
I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.
GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.
The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.
I have the same problem with my 99 Lexus GS 300, I was told by a lexus repair guy, that he will fix it just by replacing the TPS Switch and the Throttle Position Sensor, which is the same thing. But base on your comments which are very helpful you mentioned that what took care of the issue was the Idle Valve Motor....a part that I can not find anywhere, the stuff I'm seeing online associates it with the AC. If you are still out there please let me know by posting the anwere. Thanks.
I have 2001 GS300 and code came up p1120 Accelerato pedal positioning sensor circi malfanction. My sister has same GS and I swapped at first sensor and drive around till same thing happen, like after 4 miles driving. So I went further and swapped electric motor that controls throttle flops and drive again about same distance and light came up again. so I replace both units on the throutle and still got same problem. What else can it be? Please post if you got answers?
how the actual testing wasdone with the ohm meter would be alot more helpful than saying that the problem is solved
i have the same gs300 98 with code p1120, does this mean that just because the codes reads a sensor problem, but the problem doesnt necessarily mean the sensor is bad but something connecting to the sensor is wrong and it is alarming the sensor if that makes any sense.
so my question is i have the same trouble with my vehicle but i should examine the idle valve motor?
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Same symptoms....at first I was told several times that it was the catalitic convertor; but was then told accelerator positioning sensor. We were going to repair it at first ourselves but the were told it would not be timed accurately so in Ga I paid $415 to have it repaired; approx $300 just for sensor and I may have burned up the membrane.
I just bought a used throttle body with all the sensors on ebay, took out my old throttle body w/sensors, cleaned up the used one a bit, then put it in and the car runs perfect now, no CELs!
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Sorry!! I ment accelerator pedal position sensor!!!
I've posted my problem on other sites too. Looks like noboby knows how to fix it.
i have this same problem for the same car....the vsc code came on ...and i couldn't switch the car into gear...please help
i have the same problems
are u talken about tha trottle body position sensor
can find the bolts
2006 Lexus gs300 unsolved problems
my lexus gs300 gear indicator is out
What could it be?
p0141 code
turn off vsc light
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