1994 SSEi - traction control problem. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-06-2006, 09:36 AM   #1
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Default 1994 SSEi - traction control problem.

Hi!
I'm a newbie here, just bought this one:


Almost everything runs well (rather strange for this year, but...) except traction control.
Seller told me, that all sensors are ok (i think so too, because ABS works fine) and he already replaced the engine computer (it had no effect, now i have spare engine control module), and the technicians suggested, that the problem is "in the bus between ECM and traction module".
If i disconnect the battery, trouble goes out (traction works well), but after about 3 starts it comes again and i have "service engine soon" and "traction control off" lights in my cluster.

Can anybody sugest, where is a problem?
Thanks!
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Old 03-06-2006, 09:40 AM   #2
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The two codes are unrelated. Your traction control problem is likely to be the PMV assembly below the airbox.

Changing the main computer (PCM) will do nothing for the TC or ABS. The EBTCM computer is located on the firewall behind the stereo to the right of the gas pedal. It'* expensive too, but not as common of a problem.

To get the codes retrieved from the system, you have to take it to a GM dealer who has the right serial reader for it. You cannot read these codes from the PCM/ALDL connector.

You may end up doing what most of us do when it fails. Live without it! That'* gotta be fun during winter in Russia, eh?

I'd say other than the TC/ABS systems, the 92-95 Bonnevilles are VERY reliable.
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Old 03-06-2006, 09:50 AM   #3
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Thanks! I'll try to find another PMV or to locate trouble near it.

Driving in winter in Russia is not pleasant, but not because a lot of snow. There is _a_lot_of mud on the roads an the windsield and headlamps are very dirty all the time. Wipers and washers could't help.
Here is my Bonny right after i've bought it:

But out of cities is much more cleaner.
I can drive without traction, but i want to care about my transaxle - it will live a bit longer without spinning wheels on ice.
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Old 03-06-2006, 09:53 AM   #4
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Sorry, Willwren!
I tried to find "PMV" in acronyms, but had ton found.
Can you explain?

Thanks a lot!!!
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Old 03-06-2006, 10:08 AM   #5
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First of all, spinning on ice transfers no force to the transaxle. It'* unloaded and protected by the ice. It'* when you ABRUPTLY regain traction that it can be a problem.

The PMV is the Pressure Modulator Valve assembly under your airbox. It has a silver pump body on it, and 6 brake lines. There is also a small reservior that feeds from the master cylinder. You can follow that rubber line down to the PMV.

What usually fails in a traction-only failure are the coils in the gate valves. The pump in the PMV pre-pressurizes some brake fluid a nd holds it in a reservior until you lose traction. Then it opens either the left or right valve (whichever is spinning faster) and releases pressurized brake fluid to the caliper that is spinning fastest. Applied braking to control traction.

The little coils corrode over time and cannot be replaced. The whole PMV must be. I'm not saying this IS your problem, but it'* the most likely scenario.
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Old 03-07-2006, 12:07 AM   #6
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Spinng on ice CAN cause transaxle problems. If only one tire is spinning that means the spider gears in the differential are spinning at a speed higher than they are designed to. This WILL eventually cause the spider gears to weld themseves to the pin they rotate on and cause extensive damage to the casing if the pin breaks and even other internal parts if framents of metal find their way thoughout the tranny.
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Old 03-07-2006, 01:19 AM   #7
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Quote:
Originally Posted by yer jealous
Spinng on ice CAN cause transaxle problems. If only one tire is spinning that means the spider gears in the differential are spinning at a speed higher than they are designed to. This WILL eventually cause the spider gears to weld themseves to the pin they rotate on and cause extensive damage to the casing if the pin breaks and even other internal parts if framents of metal find their way thoughout the tranny.
You have to be kidding me. Nothing in your diff will weld itself if the fluid is still flowing. Nobody has EVER had a failure like you describe, and when you're spinning, MOST intelligent people let off on the throttle.

Not to mention the fact that when spinning on ice, friction (tire/road) is almost eliminated, which UNLOADS the grief on the trans.

Let'* not start rumors and freak people out.
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Old 03-07-2006, 07:50 AM   #8
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Quote:
Originally Posted by Serj.ru
Driving in winter in Russia is not pleasant, but not because a lot of snow. There is _a_lot_of mud on the roads an the windsield and headlamps are very dirty all the time. Wipers and washers could't help.
Wow.. I thought I'd be the furthest to the East

besides... welcome to the club - my car looks exactly the same in winter .. no matter what I'd do
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