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Discussion Starter #1
Hi All,

I have searched the forums and tried a few things, but cant seem to resolve my issues.

I purchased a 2007 sequoia about 6 months ago with 165k miles. The truck has been great, but one thing has been bugging me. When ever I accelerate from a stop when in 4HI, the traction control engages and a lose power for a few seconds. this happens both when going straight and turning. The truck needed an alignment so I had that done to DJ's specs, and performed a zero point calibration using the paper clip method afterwards, but did not help. When I unplug the connector to the master cylinder, the issue goes away, so I have narrowed it down the the VSC system and to confirm, this only happens in 4HI.

What else should I be looking at? the yaw sensor or the wheel speed sensors? anything else that needs to be recalibrated?

Thanks in advance
 

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Hi All,

I have searched the forums and tried a few things, but cant seem to resolve my issues.

I purchased a 2007 sequoia about 6 months ago with 165k miles. The truck has been great, but one thing has been bugging me. When ever I accelerate from a stop when in 4HI, the traction control engages and a lose power for a few seconds. this happens both when going straight and turning. The truck needed an alignment so I had that done to DJ's specs, and performed a zero point calibration using the paper clip method afterwards, but did not help. When I unplug the connector to the master cylinder, the issue goes away, so I have narrowed it down the the VSC system and to confirm, this only happens in 4HI.

What else should I be looking at? the yaw sensor or the wheel speed sensors? anything else that needs to be recalibrated?

Thanks in advance
 

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My son had a Sequoia that had a defective VSC...he didn't know it until it suddenly went out of control on a down hill at 35 MPH, cost his insurance over 4 grand. There was a recall on them & some Tundras, but I don't remember what years. I would check 1st to see if there is a recall. I have a 06 Tundra DC Limited, defective VSC, but no recall, so I simply disconnected the same connector as you. Everything works fine except the limited slip differential & a few idiot lights showing, but I don't care since mine showed the defect & it threw me into the opposite lane at 60 MPH. Good thing no oncoming traffic as I had absolutely no control until I managed to slow down. I would advise you to leave yours unplugged untill you know for certain & it is repaired.
 

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PS- My son was in 4X4, but I was in 2 wheel drive. I took it to the dealer to check on a recall & was told there was none...about $285 to put it on the computer to test plus labor & parts to fix IF they could find the problem. Easier to pull the plug...no issues since.
 

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An 07 probably has a slightly different system than my 02, but a wheel speed sensor or pick-up ring missing a tooth might be a culprit. I just recently "tested" the VSC and Trac on mine and they only come on when I'm really ham fisting around, so for them to come on just from moving from a stop is abnormal.
 

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VSC is garbage. I pulled the plug on my VSC entirely because the system is not only faulty but has done more harm than good. Sadly I'll have to deal with not having A-Trac either until I get new gears and lockers. :/
 

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Discussion Starter #7
Thanks for the input. When I get some spare time, I will take a look at the front wheel speed sensors and hopefully that is my problem. I'll report back any findings.
 
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