Re: TCS Limp Home - Saab 9000 Bulletin Board - Saabnet.com
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Re: TCS Limp Home
Posted by SaabKen [Email] (more from SaabKen) on Thu, 5 Dec 2002 02:31:04
In Reply to: Re: TCS Limp Home, Chris, Thu, 5 Dec 2002 02:16:30
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Miranda & Chris,
My '93 CSE Turbo automatic went into TCS limp home mode (LHM) for the better part of the first 10 months I owned the car. Similar symptoms as you both described: rough idle, very stiff throttle, base boost only, TCS Ctrl light on. Each time I pull over, wait 1 min, turn off car and restart car resets the problem.
LHM almost always happened if I'm cruising and suddenly press the gas pedal past 1/2 way. Usually uphills. I had the TCS safety valve replaced, throttle body cleaned, vacuum hoses checked and TCS wiring contacts cleaned. Each time diagnosed with the TechII computer. Still no solution. Then finally a shop in Seattle properly diagnosed and traced the problem to the throttle body unit itself ... a US$650 part. They slapped it on, recalibrated the TCS system, test drove around town like mad and never able to invoke LHM. That was 6 months ago and I haven't had one LHM since.
I hope you don't end up replacing your throttle body or the TCS computer as they are expensive parts. But if either one is diagnosed properly to be the cultprits, you may actually start save money by replacing it than to continue getting (and paying for) misdiagnosis by shops.
PS: 5-spd std cars may go into LHM if the throttle position sensor inside the throttle body is faulty ... it's a US$60 part. Unfortunately automatic cars can't replace just that part and has to replace entire throttle body.
Good luck !
Ken in Vancouver, B.C.
1993 9000CSET, 4A "Matilda"
178,000km
posted by 209.90.16...
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