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OT: Scary "fix" for Toyota throttle problem....
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Posted by MI-Roger [Email] (#882) [Profile/Gallery] (more from MI-Roger) on Fri, 19 Feb 2010 06:57:25 Share Post by Email
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The Pontiac Vibe is effectively a Toyota Matrix wearing different trim and badging. I have a sister-in-law and a co-worker who each own one of these vehicles. Today I got a peek at the 16 page Technical Service Bulletin detailing how to "fix" the stick throttle issue.

The official news reports describe the fix as "installation of a precisionion steel reinforcement" to the throttle pedal. After reading all 16 pages of the TSB, I scream "Hog Wash!"

It appears the Toyota designed throttle employs a proximity sensor in the accelerator assembly to determine throttle position. The repair involves insertion of a small piece of shim stock in the actuator mechanism as the target of the proximity sensor to correct out of tolerance conditions. Approximately a dozen different shims are available to the mechanics doing this job, each shim varying in thickness steps by only 0.20mm.

Note that I said insertion of a shim. There is no means to permantly affix these thin shims in position, they just freely sit upon a movable lever (accelerator pedal) which constantly changes position based upon driver input.

Maybe I am interpreting the TSB instructions incorrectly, but I have grave concerns regarding this repair technique.

posted by 198.208.15... 
_______________________________________
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2006 9-3SC 2.0T - Wife's daily driver
2000 Viggen Convertible - Sold May, 2022
1964 Quantum IV Formula Car - Retirement project
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