2000 Nissan Quest Transmission repairs not always needed...

2000 NISSAN QUEST
86,000 MILES • 6 CYL • FWD • AUTOMATIC
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MOMINCARROLLTONTX
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My 2000 Nissan Quest suddenly one day seemed to have transmission trouble so I drove it very slowly about 6 miles or so at 15mph to a transmission repair shop. It came back with a T.P.S. code for the Throttle Position Sensor. They charged me almost $1900 and gave me the car back driving the EXACT SAME WAY. Then my mechanic (doesn't do transmission work so he didn't see it first) fixed the initial code- Throttle Position Sensor in about an hour for $267 and said the transmission shop should never have repaired the transmission without first replacing the TPS because the transmission symptoms might have gone away. Is this true?
Sep 13, 2009 at 3:17 AM
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SERVICE WRITER
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I would have to agree on both counts. CEL should have been checked for codes and at least given credibility towards the symptoms. If the TPS is defective and the pcm believes the throttle isn't open all the way, it won't make a/f ratio adjustments.

IT thinks the the throttle is just cracked open a little it is reasonable to expect the engine will not increase rpms.
Sep 13, 2009 at 6:31 AM
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