ABS is not modulating; No Warning Lights or DIC codes
Thread Starter
Cruising
Joined: May 2013
Posts: 14
Likes: 0
From: Seabrook TX
ABS is not modulating; No Warning Lights or DIC codes
I took my 2003 Z06 that I bought about a year ago
to my first HPDE this weekend and we did an all stop test to practice and my wheels locked up. I have no warning lights and no DIC codes. I looked at the fuses and 52 and 53 were both fine and all the way in. I can't find anything in the forum that matches this problem. I need help on where to trouble shoot. Thanks. By the way. The weekend was awesome.
to my first HPDE this weekend and we did an all stop test to practice and my wheels locked up. I have no warning lights and no DIC codes. I looked at the fuses and 52 and 53 were both fine and all the way in. I can't find anything in the forum that matches this problem. I need help on where to trouble shoot. Thanks. By the way. The weekend was awesome.
Last edited by SteveGreer; May 20, 2014 at 06:33 PM.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Wondering if the pump motor has failed or the connection came loose. If I recall the pump has a separate 2 pin connector just for it. Not at home with the FSM to see if that would throw a code.
Indeed, your issue is very unusual.
Indeed, your issue is very unusual.
Drifting
Joined: Oct 2002
Posts: 1,773
Likes: 66
From: SoCal
Drifting
Joined: Oct 2002
Posts: 1,773
Likes: 66
From: SoCal
Thread Starter
Cruising
Joined: May 2013
Posts: 14
Likes: 0
From: Seabrook TX
I'll try the parking lot in the rain next time I have a chance.
The Traction control and AH seemed to work fine out on the track, got some AH messages. And I can turn them both off and also go into Competitive mode. The traction handling message comes on if I accelerate and spin the tires so that system seems to be working fine.
But believe it, I have no ABS with no codes in the DIC and none on the Instrument panel. And all the lights on the panel check during ignition turn on.
I guess I'll have to take it to the shop since this is an unheard of problem.
Thanks again.
The Traction control and AH seemed to work fine out on the track, got some AH messages. And I can turn them both off and also go into Competitive mode. The traction handling message comes on if I accelerate and spin the tires so that system seems to be working fine.
But believe it, I have no ABS with no codes in the DIC and none on the Instrument panel. And all the lights on the panel check during ignition turn on.
I guess I'll have to take it to the shop since this is an unheard of problem.
Thanks again.
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Melting Slicks
Joined: Apr 2004
Posts: 2,301
Likes: 199
From: Valencia CA
With stickier tires and better brakes the ABS triggers too quickly.
ABS is a fantastic device for 90% of the drivers on the road.
I have a little different feel for what the car is doing than most drivers, I prefer to modulate the pedal based on the situtation/conditions and not some pre determined deceleration parameter.
ABS is a fantastic device for 90% of the drivers on the road.
I have a little different feel for what the car is doing than most drivers, I prefer to modulate the pedal based on the situtation/conditions and not some pre determined deceleration parameter.
Plus, ABS stopping distance can be longer than what a competent driver can do. ABS was really meant to keep poor drivers from loosing control.
Melting Slicks
Joined: Jul 2012
Posts: 2,507
Likes: 9
Thread Starter
Cruising
Joined: May 2013
Posts: 14
Likes: 0
From: Seabrook TX
Finally had England Green look at the ABS problem.
Here is the report.
Diagnose ABS system not working. Static tested
ABS module, circuits and system, ABS system
functioning correctly while static. Drove vehicle,
noticed ABS not functioning and one wheel
locking up, no pedal modulation. No outward
signs or codes to point to problem. Drove
vehicle extensively with GM Tech II diagnostics
tool. Initially suspected wheel speed sensors but
they passed all tests. Drove vehicle in small
circles and observed that the wheel speed
sensors were reporting incorrect data. Wheel
speed sensor harness was wired incorrectly -
left front for right front and vice versa.
Corrected wiring of wheel speed sensors.
Here is the report.
Diagnose ABS system not working. Static tested
ABS module, circuits and system, ABS system
functioning correctly while static. Drove vehicle,
noticed ABS not functioning and one wheel
locking up, no pedal modulation. No outward
signs or codes to point to problem. Drove
vehicle extensively with GM Tech II diagnostics
tool. Initially suspected wheel speed sensors but
they passed all tests. Drove vehicle in small
circles and observed that the wheel speed
sensors were reporting incorrect data. Wheel
speed sensor harness was wired incorrectly -
left front for right front and vice versa.
Corrected wiring of wheel speed sensors.
Thread Starter
Cruising
Joined: May 2013
Posts: 14
Likes: 0
From: Seabrook TX
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
Have you tested it since the repair? I would think in a straight line panic stop, it wouldn't make a difference. If the sensors were crossed, the active handling should not have worked properly.
Just my .02
Just my .02
Thread Starter
Cruising
Joined: May 2013
Posts: 14
Likes: 0
From: Seabrook TX
The HPDE was a straight ahead panic stop where you were supposed to let the ABS bring you to a stop. I also had it happen on the track when I braked too hard. My wheels locked up and there was no ABS. I'm not sure why the crossed wires would cause this problem but must be something with the computer calculations. Garbage in Garbage out is my guess.