traction control & check engine light are on 1995 Bonnev - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-25-2004, 04:13 PM   #1
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Default traction control & check engine light are on 1995 Bonnev

I have a 95 Bonneville SE w/150k miles on it. My niece is buying it from me, so my brother and I wanted to do everything it might need so she has a trouble free car. After doing the maintenance work the traction control light and the check engine light are on. The car seems to run ok, but they are on. The ABS light is not on. I suspect something I did with the brakes is the culprit, but here is the whole list of what was done yesterday:
Radiator hoses and thermostat. At the same time I found a bad vaccum line connection near the thermostat and replaced it. I do not know what the line is for, but it runs over near the driver'* front headlight. Might be a wheel sensor. I also had an air pocket when I started it so I needed a lot of coolant. The engine ran rough until I got all the air out of the system
Alternator.
Transimission filter and fluid
Oil change
PCV valve
Plugs and wires
Two new front calipers and flush the system. This is where I suspect I made a mistake. To flush the system I started at the rear passenger. I pumped ten times then open the bleeder and continued until done. I could never get clear fluid, but I got it much better than it was. It took me 45 mins on that one wheel alone. When I got to the fronts it was still slow going so I tried the same thing with the car running. If anybody knows a better way I would appreciate it.
Can anybody help me? Is it possible the electrical work messed me up? I replaced the power modulator valve already about 100k miles ago.

Thanks in advance for the help
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Old 07-25-2004, 04:24 PM   #2
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Bleed that sucker again. Flush the whole system from RR, LR, RF, LF sequence. At least 2 rotations. The traction control uses applied braking. You may have air in the pump/reservoir. Check the fluid reservior in the master AND ABS reserviors, and verify that all 4 wheel speed sensors are connected and clean.

You'll have to have the codes pulled for the SES light. It'* unrelated. ABS/Traction do not communicate with the PCM.
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Old 07-25-2004, 09:07 PM   #3
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Should it have taken 2 hours to bleed them? I used the sequence you have listed, pump 10 times, open bleeder until pedal is to floor and then close. I never let the master cylinder run dry. I bet I did the pump cycle a hundred times total. If I have air in the system would it cause the traction control light to come on?

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Old 07-25-2004, 09:16 PM   #4
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Humor me. Considering your problem, the traction pump pressurizes 15 seconds after the ignition is turned on. Turn on the ignition for 20 seconds after each corner, then turn it off again. 2 full rotations. It sounds like a pain, but I'm suspecting an air pocket preventing the pump from pressurizing. Get where I'm going?

The pump pressurizes the system in the PMV up to the gate valves. When wheel slip is detected, the valves release pressure to the brake cylinders as needed. This may explain why the ABS light isn't on. The pump is the non-common factor.
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Old 07-25-2004, 11:15 PM   #5
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Ok. I think I understand where you are going with this. Just to make sure I understand the procedure: Bleed wheel. Then close the bleeder and turn the car on. Repeat for all four corners. Repeat the whole process again. Do I need to bleed each wheel until the fluid runs clear? Or just bleed 1 time to get the air out?

If at any point while I am doing this the traction control light goes out would you stop? Or would you keep going?

How long should it take? Does it seem abnormal I bled so many times?

Thanks for the help
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