Slip Sensor = No Power

[northern feller]

Has anyone else had this happen? At highway speeds 100 km/hr + and only twice my slip light has started flashing on dry surfaces. When it happens the truck can maintain it's current speeds and accelerate slowly however I can not accelerate with the power the 4.0 L can deliver.

I've seen a wet harness after a car wash with an under spray cause minor issues on my old 2003. Just wondering if it might be something like this. Has anyone heard of it, dealt with it etc etc before I head over to Nissan and offer them my butthole.

thanks

[studum]

I've read about the ABS sensors giving the newer trucks some headaches over on clubfrontier. If your ABS sensor isn't reading correctly it will make the truck think it's slipping when it's not. When you experience the loss of power it's the truck trying to reduce the slip that it thinks is happening.

That's my guess...

[Miner]

Hey you're alive...and with a new X no less!

Yes a problem with the ABS could be the culprit, however with my ABS experience with the Titan a sensor problem shows up as an ABS light before it affects the traction control. Does the problem occur in a turn or in a straight line?

[northern feller]

Alive yes! Sane, not sure.
It happens in a straight line and only at highway speeds. There is also a distinct humming which starts, but may be unrelated because the humming happens all the time and the slip has only occurred twice.

[Miner]

Well the front wheel bearings start as a hum at highways speeds, then get louder, then at lower speeds .... and then the ABS sensor goes and throws the light on. There must be a ABS self diagnostic that the truck runs when you hit 80 kph, every time I broke 80 the light came back.

Might not be the problem but it sounds familiar. Good news is the bearings come with the sensors, bad news is they were $268 each.


Evidence that I'm around kids too much, I'm writing "and then" stories.

[Miner]

On my drive in I got to thinking that your Slip light is coming on, not the ABS, this may be indicating that it is getting an erratic wheel speed signal from the drive (rear) wheels. I would focus my troubleshooting on the rear ABS sensors, connections and wheel bearings.

[northern feller]

I'll just get Northern Nissan to take a look at it. I don't really have the time to mess around with it right now.
Thanks

[Morpheus]

Tell the boys at Northern I said hi!

you'll find that it's the bearing and/or sensor. It's possible the bearing is bad enough by it's self and just throwing off the sensor, but you might need both.

With our equipment, we can see in real time what each sensor is recording as a speed reading. One or more of the sensors is probably dropping off, and the system interprets that as a "slip" of that wheel, and reduces engine power as part of it's programming to reduce the slip.

the ABS self diagnostic happens at 10(miles) per hour, so 80kph doesn't have anything to do with it, other than maybe that's when the bearing starts to wobble a bit, and throws off the sensor.

[Miner]

the ABS self diagnostic happens at 10(miles) per hour, so 80kph doesn't have anything to do with it, other than maybe that's when the bearing starts to wobble a bit, and throws off the sensor.

That makes sense as sometimes it would come on sooner, but generally in the first significant turn above 80kph (enough difference in wheel speed, or bearing "wobble" to throw the sensor off).

My gut says bearing because you can hear it, but that sound could be completely unrelated.

[dark_knight]

Uneven tire pressure maybe. for sure its a wheel speed sensor. once the wheels rotate at different speeds the traction control kicks in to control the slip and cuts engine power to regain 'traction' to the slipping wheel, even with the VDC turned off.