Tell me about my "Traction Control" - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-14-2006, 04:07 PM   #11
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Quote:
Originally Posted by Echo SSEI
Quote:
Originally Posted by BillBoost37
Give the front two wheel speed connectors and wiring a good check over since the trans was recently out of the car.
we'll do, going to replace the splash gaurds anyways, which means taking off the tires...
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Old 07-14-2006, 05:22 PM   #12
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Both front sensors are pluged in correctly, nothing outta the norm...
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Old 07-14-2006, 06:09 PM   #13
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Did you disconnect and double check the pins to make sure they didn't get bent when going back together. And how about the wiring feeding them. Most likely your cradle was removed and it'* possible wires got molested.
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Old 07-14-2006, 06:29 PM   #14
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Originally Posted by BillBoost37
Did you disconnect and double check the pins to make sure they didn't get bent when going back together. And how about the wiring feeding them. Most likely your cradle was removed and it'* possible wires got molested.
hhhmmm, no, I didn't do that. pulled onthem to make sure they were secure. I told the tranny shop I was having Traction Control issues, and I quote, they were like "Oh crap" . I think i'll have you gearheads look at it at WCBF. If not, I'm going to take it back into the tranny shop and tell them to fix it.
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Old 07-14-2006, 08:19 PM   #15
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I've been through this extensively on the Zilla.

Both systems are related, but don't always use the same PORTIONS of the same components.

TRACTION:
All 4 wheel speed sensors are used. The front spinning tires are determined to be spinning by the comparison to the rear speed sensors which cannot. The rear is the reference. If traction loss is detected, the PMV (pressure modulator valve) assembly opens small solonoids to the front calipers, allowing pressurized brake fluid from the PMV pump assembly (to whichever wheel is spinning) applying braking force to make them only spin a certain percentage faster than the rear (this is because when in a left turn, the RF is normally travelling faster). Typical failures can be (in order of likelyhood):

1. Wheel speed sensor. Corrosion, wiring, or sensor (hub).
2. PMV. Very expensive. Learn to live without traction like me. This is where the little solonoids fail from old corrosive brake fluid, and they can no longer open.
3. EBCM. Electronic brake control module. This is the brain. Also very expensive, but in all my time here, I've only seen one that PROBABLY failed.

ABS:
Works nearly the opposite as traction. While this isn't your problem, just understand that it PULSES the calipers OFF based on the wheel speed at all 4 wheels, getting an input from the VSS (vehicle speed sensor). If the vehicle is still moving (slowing down) and it detects the right rear is not moving, it will remove braking from that one in pulses to allow it to continue to spin and brake, preventing a skid.


********************************************
This is information is in GENERAL for the 92-95 cars that don't use torque management to help contol traction.
********************************************

John, some basic checks are in order for your WSS connections and wires (remember my accessory belt shredding at Woodburn back in 04? It ripped out my RF wss wiring), and the FSM should have some BASIC WSS functions you can check with a meter.
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