VDCoff and slip light problems please help! - 6MT.net Infiniti G35/G37/GTR Forums
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post #1 of 29 Old 12-01-2013, 03:39 PM Thread Starter
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Default VDCoff and slip light problems please help!

I recently had a legit computer alignment that found my toe was way out of wack, which was causeing extreme inside tire wear on my front tires. After the alignment, when I hit around 40 or 50 mph, my vdcoff and slip light comes on. Now sometimes before the failsafe lights come on and Im making a right turn, for example on a freeway on ramp, the car will try to brake itself as if it is on ice. Besides that, the car drives as usual. Any thoughts? Thanks 03 g35 coupe.
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post #2 of 29 Old 12-02-2013, 02:30 AM
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What is your history with the car?

Assuming you've owned it a while and never had anything like this pop up before, I wonder if a wheel sensor was bumped out of place or something. Others here know more about their placement.

That ABS pulsed braking you get is the car thinking it has to control wheel speed/spin. The sensor is probably being fooled.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #3 of 29 Old 12-02-2013, 11:17 AM
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Wheel sensor would be one guess. Another is the shop disconnected the steering column and did not realign it properly making the car think the wheel is off center when it really isn't. Either one should be a quick and easy check.

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post #4 of 29 Old 12-02-2013, 01:33 PM Thread Starter
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This may sound crazy but the failsafe (the slip and vdc off lights) dont come on until i hit around forty mph. While its NOT on failsafe, if I am turning right and on a downslope, like entering the freeway on ramp, the car tries to brake as if I am on ice. ONLY when im on a downslope and turning right. No other time. Maybe that will narrow down what it could be. Thanks
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post #5 of 29 Old 12-02-2013, 02:00 PM
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Originally Posted by stuntdub View Post
This may sound crazy but the failsafe (the slip and vdc off lights) dont come on until i hit around forty mph. While its NOT on failsafe, if I am turning right and on a downslope, like entering the freeway on ramp, the car tries to brake as if I am on ice. ONLY when im on a downslope and turning right. No other time. Maybe that will narrow down what it could be. Thanks
I've had similar happen. On my car a right-hand curve at 40 mph or more gets the VDC nervous. It happens pretty consistently on one part of road I travel getting to work.

I'm pretty sure VDC is not active at lower speeds or the threshold is higher than the body roll for the yaw sensor- maybe in my case.

I noticed mine happen after I went up to a bigger rear tire size that is likely beyond the size ratio range for the f/r tire differential. (Over 3% and 2.7 is OEM spec with stock sizes).
I'm on 255 45 18's and 225 45 18's until my fronts wear down, then I'll get the sizing right and see if it helps.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #6 of 29 Old 12-02-2013, 05:21 PM Thread Starter
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I'm on 275/40 18's and 235/40 18's I've been on those for about 6 months and, as I said before, it started happening when I had a computerized alignment done. I have a friend that that works for a honda dealership in town take it in and service the differential. I dont know if he is blowing smoke or talking out the side of his neck, but he said that the differential fluid was real low and that I would have to drive it for awhile before the lights go off. Do you think that I could have damaged the differential by the size of rear tires I put on it? Thanks for your input.
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post #7 of 29 Old 12-02-2013, 09:55 PM
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I don't think the differential has anything to do with it.

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
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post #8 of 29 Old 12-02-2013, 11:40 PM Thread Starter
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I didnt think so either. Is it possible that something from the front end could be causing it? or is the slip strickly confined to the rear of the vehicle? The reason I ask is because while the car was on the rack for the alignment, I went underneath and noticed that both lower control arms were pushed forward blowing out the bushing on both of them. I bought two new complete lower control arms hoping that would fix the problem, but no luck. Besides, those looked to have gone bad way before the lights ever appeared. I still think that as Bachman and GZire commented, something happened to a wheel sensor or steering angle sensor. Although would that create the actual slip i get when turning right headed downhill. Hmmm
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post #9 of 29 Old 12-03-2013, 03:34 AM
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Although would that create the actual slip i get when turning right headed downhill. Hmmm
No.
The 'slip' isn't actual but the car thinks it is. The system is pretty complex and monitors alot of things at once. Any of the 4 wheel sensors could be the issue. I'm thinking a mild bump from correct sensor postion can cause intermittent lights at certain driving conditions related to speed and curves.

As for the rear wheels, the differential won't have a problem unless you drove the car with different sizes at the rear wheels like a 255 45 18 on the dirver side and a 275 on the passenger side.

As to the sizing you have- 275's versus 235's, I'm amazed you don't get the lights on a lot and this being a new issue. I'll check my math but I think you are a long ways out of the VDC tire size differential range.

** Added; Revolutions per mile; that difference is 4.5 % to 5 % on a few tire samples at 275 compared to 235's I looked up so you are well away from the VDC spec range for size diff f/r.
On your next tires, I'd move to a 255 up front or drop to a 255 on the rear. That alone might make it go away. I understand it's a new problem but the variation in tire size could easily exacerbate the VDC lights and whatever the other variable/s.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16

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post #10 of 29 Old 12-03-2013, 03:59 PM Thread Starter
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Thanks, thats good advice. I will go to 255 in thew back. Maybe when the alignment was put correct, the system noticed the tire size variation and thats why the issue started right after I got the alignment. Thanks
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post #11 of 29 Old 12-04-2013, 01:01 AM
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Well, I hope it helps or even cures it but it sure won't hurt.

If you ever want to look at tire size options, tirerack.com list tire specs for all sizes and the rev/miles is stated there as well. Just divide r/m of the two sizes you are looking at and 2.7% is spot on. 3 is still pretty safe. I think some run one size all around w/o problems but the stance of the car won't look the same.

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #12 of 29 Old 12-06-2013, 10:22 PM Thread Starter
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Update: I spoke with the guy who did my alignment and previously i had mentioned to him that I was getting inside wear on my tires. Anyways, he let me know that at the time of the alignment, he took all the neg. out of my rear tires so that, as he put it, the tires stood straight up to minimize the tire wear. From what I understand, the G35 comes and is expected to have a negative camber for performance. Light bulb went on and I told him that maybe if we set the rear wheels back to a small neg. camber the slip light will go off. We were going to do this Thursday. What do you think? Possible?
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post #13 of 29 Old 12-07-2013, 12:56 AM
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Not sure but it's pretty handy to know that if you do indeed fix the issue, you've gone about it the correct way ie;

If a sensor was slightly out of position and the alignment change affected it, this would possibly "fix it" but the sensor would still not be in the correct position (as an example).

'04 G35 6MT, DG Coupe, Prem/Nav, purchased 06/2011 @97k mi / 119,650 as of 07.06.16
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post #14 of 29 Old 12-07-2013, 01:03 AM
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The speed sensors for the rear are located on each side of the rear differential. Adjusting the rear camber should not have any effect on hoe the sensor reads wheel speed.

Have you checked that your brake fluid is topped off?

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
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post #15 of 29 Old 12-07-2013, 01:48 AM Thread Starter
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Yes, I've checked the brake fluid and made sure it was topped off. Here's something that happened today that was a little different. Usually the lights kick on right around 45 mph or when i hit 3rd gear. Today, one time they didn't come on until i was at 70mph. The car will be up in the air on Thursday so I'm going to check the speed sensors at that time. Each side of the differential. What should I look for as far as them being in a correct position?
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