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Old 03-02-11, 07:56 PM   #46
tom steele
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Quote:
Originally Posted by Och View Post
Hey, sorry, didn't realize you had an earlier one.

Yours actually still has a throttle cable I believe, but only a partial cable - the throttle body still has a motor that operates the butterfly. Your pedal however doesn't have the sensor to the best of my knowledge.

Refer to the link below for part reference. Repace ******* with t o y o d i y (no spaces)

http://www.*******.com/parts/p_U_199...AQKA_7801.html
the pedal sensor is in the throttle body i had a freind with this issue swaped out my throttle body with his still the same problem his ended up being the ecu i replaced the motor and tps but it was the ecu so i would check that as well.
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Old 03-06-11, 10:52 AM   #47
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So I ended up ordering a new Throttle Position Sensor (TPS), hopefully this solves the problem. Now the only thing is getting a diagnostic tool that can help me adjust it to the factory specs (14.4 - 16%). Do you guys think I'll be able to exactly mark the position of my old one and just install the new one in the same position?

BTW, it's for a GS430, so there is no cable at all that needs to be adjusted, all electronic.
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Old 03-06-11, 11:42 AM   #48
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^ I can try to help you with the install.
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Old 03-16-11, 03:05 PM   #49
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Quote:
Originally Posted by habeeb89 View Post
So I ended up ordering a new Throttle Position Sensor (TPS), hopefully this solves the problem. Now the only thing is getting a diagnostic tool that can help me adjust it to the factory specs (14.4 - 16%). Do you guys think I'll be able to exactly mark the position of my old one and just install the new one in the same position?

BTW, it's for a GS430, so there is no cable at all that needs to be adjusted, all electronic.
No, dont even try to do it without calibrating it.
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Old 04-05-11, 11:43 PM   #50
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So, here is our latest with this ongoing headache. After having put on 4 new tires, we had the dealer do the 4-wheel alignment. While there, my wife let them know we are still experiencing the "loss of power" in the pedal after taking off from a stop as well as occasionally while cruising on the highway. Having already replaced the plugs, MAF sensor, and TPS, the only thing left in my mind was the Accelerator Pedal Position Sensor.

The (Parts Specialist) tells her the whole pedal assembly would need to be changed, not just a sensor. Part is $215, not including labor. However, the Parts Specialist also said the more likely culprit is the the whole throttle body and that he has not seen many APPS go bad. Cost of the throttle body assembly is $800 without labor.

Looking for honest opinions here, but do you think the throttle body itself could be causing the issue to arise again? I know it has been cleaned recently. Is it worth spending the money to just have it done, or starting out with the cheaper sensor and see how long that lasts if it is not the issue?

For now, she just has to deal with it and hope it doesn't end up causing some serious accident or keep her from avoiding one as these huge labor costs every month are hard to come up with.
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Old 04-23-11, 12:26 PM   #51
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Quote:
Originally Posted by PHX-GS430 View Post
So, here is our latest with this ongoing headache. After having put on 4 new tires, we had the dealer do the 4-wheel alignment. While there, my wife let them know we are still experiencing the "loss of power" in the pedal after taking off from a stop as well as occasionally while cruising on the highway. Having already replaced the plugs, MAF sensor, and TPS, the only thing left in my mind was the Accelerator Pedal Position Sensor.

The (Parts Specialist) tells her the whole pedal assembly would need to be changed, not just a sensor. Part is $215, not including labor. However, the Parts Specialist also said the more likely culprit is the the whole throttle body and that he has not seen many APPS go bad. Cost of the throttle body assembly is $800 without labor.

Looking for honest opinions here, but do you think the throttle body itself could be causing the issue to arise again? I know it has been cleaned recently. Is it worth spending the money to just have it done, or starting out with the cheaper sensor and see how long that lasts if it is not the issue?

For now, she just has to deal with it and hope it doesn't end up causing some serious accident or keep her from avoiding one as these huge labor costs every month are hard to come up with.
The throttle body plate is motor operated, and if the motor is bad, then yes, you will need a new throttle body. But then if the motor is bad, the problem should be getting more and more persistent, and eventually the motor would die completely and you wont be able to accelerate at all.

I'd still say its your APPS sensor. I've replaced mine when I had similar issues and its perfect now. You can find the part a lot cheaper and the install is super easy.
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Old 06-07-11, 05:25 PM   #52
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I'm currently still experiencing this problem, and I'd like to diagnose it. I'm leaning towards the APP sensor, but I can't seem to find the part # online for a '98 GS4.
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Old 06-09-11, 11:05 AM   #53
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For anyone who is still having this problem, I was getting the usual P1121 error code and loss of power. I changed the TPS, didn't fix the problem. Like Och said, the thing that finally fixed it was the APPS, I just ordered the entire accelerator pedal assembly w/ sensor from Sewell. Don't waste your time and money on changing unnecessary parts like the TPS.
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Old 06-10-11, 10:14 PM   #54
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I am having the same problem since 2002 and have just lived with it until it has progressively gotten worse.
I have a 2000 GS 300.
It has not thrown any codes but I cleaned the MAF and it seems to help a bit. I am crossing my finger that is all I need to do. Did anyone else repair their ECU? If so where? and what needs to be repaired in it?



FOr those of you looking for parts check out my research so far. Please post part numbers for Pedal sensor

MAF
http://shop.advanceautoparts.com/web...GRPSENSAMS____

PCV Valve
http://shop.advanceautoparts.com/web...GRPFILTAMS____

I think this is the throttle positional sensor everyone is talking about. (someone please confirm)
http://shop.advanceautoparts.com/web...GRPSENSAMS____


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Old 06-13-11, 08:00 PM   #55
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For anyone with a GS 400. If you get a P1121 code by itself. It is most definitely your acceleration position sensor that is going bad. I've done extensive research within the past month and everyone who had this code replaced that sensor. Also I replaced mines today and my car is riding perfect.

Last edited by Trouble-T; 06-13-11 at 08:09 PM. Reason: error
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Old 06-13-11, 08:34 PM   #56
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Quote:
Originally Posted by Trouble-T View Post
For anyone with a GS 400. If you get a P1121 code by itself. It is most definitely your acceleration position sensor that is going bad. I've done extensive research within the past month and everyone who had this code replaced that sensor. Also I replaced mines today and my car is riding perfect.

Whats the cost?
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Old 06-14-11, 08:27 AM   #57
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I got mines from Toyota dealer for 270 plus tax. They originally wanted 347 plus tax but I told them I could get the part from sewell for 247.
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Old 06-27-11, 09:18 PM   #58
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It seems like I FIXED MY PROBLEM..

As stated in previous posts. I was having the delay but no codes.

I changed the MAF (no results)
I changed the PVC valve (no results)

I finally decided it was time to CLEAN the throttle body. After I removed the throttle body I figured I would do the spark plugs.
After removing everything to get to the spark plugs I noticed there was a significant amount of oil that leaked from the valve cover into the space of the spark plugs.

I never noticed this because the valve cover was not leaking on the outside area where it was easily seen. I replaced the valve cover gaskets and the spark plug as well as cleaned the throttle body. I went ahead and tighten the accerlator cable as well.

Since then (5 days now) it has been perfect. NO problems yet.

Will let you guys know if it comes back.
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Old 06-28-11, 09:32 AM   #59
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Quote:
Originally Posted by Och View Post
The throttle body plate is motor operated, and if the motor is bad, then yes, you will need a new throttle body. But then if the motor is bad, the problem should be getting more and more persistent, and eventually the motor would die completely and you wont be able to accelerate at all.

I'd still say its your APPS sensor. I've replaced mine when I had similar issues and its perfect now. You can find the part a lot cheaper and the install is super easy.
Dude when did you change that? Come by, I want to see if I can still rip you.
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Old 08-08-12, 12:11 PM   #60
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My 430 is hesitating too. Espcially first thingin the morning. When I put it in reverse and just press the gas, it bogs then surges. I cleaned the throttle body, and that seemed to help the fading when driving constant 45mph. New MAF sensor didn't do anything, nor new air filter. No codes being thrown.
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470, 98, accelerator, gs300, gs400, lexus, ls430, lx, out, pedal, position, sc300, sensor, symptoms, toyota

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