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Author Topic: Traction control CHAOS !!!  (Read 7686 times)
ccann26
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« on: April 28, 2014, 03:14:30 PM »



Just participated in my first SCCA solo event in my 04 z06 corvette in SSP

first two runs where good then BOOM ABS message, Service traction control, stability management all pop up and the traction control button stopped working. Car felt like I was driving on ICE around the corners very skittery everywhere.

I pulled the codes and noticed stop lamp control circuit checked the brake lights and sure enough they don't work. turn signals running lights and so forth do but no lite change on brake application. I checked my wiring for the trailer lite hookup and the green wire had melted and shorted to the exhaust, cut it out cleared the codes and they came back, car had the same issues.

Note : while starting the car after the codes were clear the ABS pulsates very very noticeably if you hold the brake while starting almost as if its doing a test and failing miserably.

Codes are :

P1574 stop lamp control circuit
1227 LR excessive wheel speed variation
1291 open brake lamp sw contacs during deccel
c1277 requested torque signal ckt malfunction
p1689 traction control delivered torque output cir

i'm thinking the electronic brake control module is fried or i need to investigate my wheel speed sensors more thoroughly.

Any thoughts ?

And yes this is the excuse i'm going with  :  )
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rothaus
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« Reply #1 on: April 28, 2014, 04:49:40 PM »


 Car felt like I was driving on ICE around the corners very skittery everywhere.


Now you know how it feels driving an old Porsche.

Sorry, I have no clue about Crevettes, but I really hope that you get it fixed for the next AX at VMP.

Cheers
Engelbert
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jamescarriv
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« Reply #2 on: April 28, 2014, 05:30:10 PM »

Maybe switch the wheel speed sensors around and see if the codes change.

And I was excited that I was only 0.5 second behind you on whatever PAX they made up. Smiley

Good luck
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« Reply #3 on: April 29, 2014, 01:33:07 PM »

Do you have an Optima Red Top or similar battery in there?  We had odd warning codes when we had regular batteries in ours.  The harsh vibrations from autocross would break connections between the cells in a regular battery and it would start the car but the voltage variations would make the car lose its mind.
Our vette killed an Optima about every 2 years but they have (or had) a 3 year warranty so we would get a new one for free each time.  But the optima never caused the gremlins like the regular battery.  The Optima just lost the ability to start the car and wouldn't hold a charge.

We also got weird stability and traction codes and errors when one of the wheel sensor cables got knocked loose.  Check the wires from the sensor all the way back to the body.  Our left front wire wore through and grounded on the a-arm.  That killed our ABS module.

When our ABS module went is was just gone.  Nothing, nada.  Bill Lloyd knows what driving a vette without ABS is like as we had invited him to drive the car at VMP just after the module failed.

Battery
Wires
then try swapping the sensors as previously suggested. 
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Keath
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ccann26
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« Reply #4 on: April 29, 2014, 04:26:33 PM »

 I found a blown fuse in the passenger foot-well and now have working lights. The stability control thing is still a mystery. The brakes work ABS doesn't seem to be present and I don't think the car is providing equal pressures because its quite a handful to drive now, different animal.

 I have a shorai battery and that is the next thing im going to check after all the wheel speed sensor connections for flattened female plugs that seems to be a common issue causing random ABS issues.

 It just sucks working on it in the rain

:  (
« Last Edit: April 30, 2014, 07:50:24 AM by ccann26 » Logged

If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. Mark Donohue
jloehlein
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« Reply #5 on: April 29, 2014, 04:49:30 PM »

The blown fuse was easy.  Definitely check the battery and alternator voltage.  Cars do funny things when you try to run them on like 10 volts.  We spent some time chasing our tail on Paul's Merkur with a bad alternator.  Showed up as the car cutting off randomly.
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« Reply #6 on: April 29, 2014, 06:50:24 PM »

We had similar alternator issues with the Camaro. They were tough to track down, but went away with a new alternator.

David
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ccann26
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« Reply #7 on: May 11, 2014, 06:29:52 PM »

During the Mothers day Autocross Keith Co-drove my car and the issue never came back up over the course of 13 runs. I guess its a possibility that the Brake light fuse is somehow related to all the codes the car was throwing. The ABS message came up more than normal but there was a trouble spot for me and many others after the backside Chicago box I seemed to build up a lot of speed leading into a right hand turn and not getting my braking done early.

Hopefully problem solved !
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« Reply #8 on: May 12, 2014, 11:18:32 AM »

The car did great. The guest driver wasn't used to getting to the cones so fast, even after running the Boss 302 in ESP.  SPEED KILLS!  Well, speed kills cones.

There were a couple of times when the brakes didn't seem to want to whoa me down as quickly as they should have but that could have been tires getting over heated.

Thanks again for letting me drive the Red Devil.  Can't wait to get my car and move into SSP.
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Keath
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« Reply #9 on: July 23, 2014, 07:03:15 PM »

Chris, I realize that this is an older post, but my wife's 2010 Pontiac G6 has just had a recall issued (July 2014), and although we have not had any problems with the G6 all of the problems that you had are listed in this recall.  The problem is apparently poor connector quality in the connections to the Body Control Module  (they call it "increased resistance in the BCM connection system").  You can check out the recall details by pulling up GM Recall 13036.  This could be your problem.
Gene Cooley
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ccann26
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« Reply #10 on: July 23, 2014, 08:19:29 PM »


 Looks like all the same stuff, my problem did sem to go away after i fixed the blown fuse. Are recalls free ?
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If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. Mark Donohue
GeneCooley
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« Reply #11 on: July 23, 2014, 10:16:44 PM »

IF they recall your car it is a free repair.  It's possible that when you repaired the wire and the blown fuse that it took a while for the BCM to reset itself (if that is possible) and start working normally again.
You might want to check the dealer or online for Corvette recalls.
Gene
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