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Gearbox judder: throttle position sensor (TPS) problem?
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<blockquote data-quote="YYC" data-source="post: 1064477574" data-attributes="member: 59459"><p>I have replaced my 6A12 auto box with a recond unit 3 months ago. Lately the gearbox experiences a judder occasionally whenever I release the accelerator pedal. Since the gearbox is still under warranty, I sent it back to the gearbox specialist for diagnostics. After some road testing and tinkering with scan tool, it was found that the ATF temp at oil cooler is abnormally high at 93 degree. He said there was a some clogs in the oil cooler, so he flushed it and have the gearbox TFT sensor (which he said was malfunctioning due to the excessive temp) replaced (RM350 burned). The temp seemed to return to lower reading about at 65 degree. The unfortunate thing is that the judder remains. So now he told me it would be the throttle position sensor (TPS) problem. “Come back after the 15th day of CNY I’ll adjust the TPS.” </p><p></p><p>It was late at 7pm, so I took my car to my friend’s garage next door to have the TPS data scanned. I was told TPS was within normal range. (I couldn’t understand but read the reading was 644 at idle and 664 at throttle opened) So there shouldn't be a problem with TPS.</p><p></p><p>Damn it. I have to endure the judder for another 2 weeks. What goes wrong?</p></blockquote><p></p>
[QUOTE="YYC, post: 1064477574, member: 59459"] I have replaced my 6A12 auto box with a recond unit 3 months ago. Lately the gearbox experiences a judder occasionally whenever I release the accelerator pedal. Since the gearbox is still under warranty, I sent it back to the gearbox specialist for diagnostics. After some road testing and tinkering with scan tool, it was found that the ATF temp at oil cooler is abnormally high at 93 degree. He said there was a some clogs in the oil cooler, so he flushed it and have the gearbox TFT sensor (which he said was malfunctioning due to the excessive temp) replaced (RM350 burned). The temp seemed to return to lower reading about at 65 degree. The unfortunate thing is that the judder remains. So now he told me it would be the throttle position sensor (TPS) problem. “Come back after the 15th day of CNY I’ll adjust the TPS.” It was late at 7pm, so I took my car to my friend’s garage next door to have the TPS data scanned. I was told TPS was within normal range. (I couldn’t understand but read the reading was 644 at idle and 664 at throttle opened) So there shouldn't be a problem with TPS. Damn it. I have to endure the judder for another 2 weeks. What goes wrong? [/QUOTE]
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Gearbox judder: throttle position sensor (TPS) problem?