traction control fault.?????

[Andyc1219]

Hi i have a 2021 Rav4 Hybrid AWD-I and the problem i am experiencing is when any pressure is placed on the brake pedal and the car goes over any kind of bump or dip in the road the traction control activates on the rear and sends the car into a sort of shimmy unnerving any one in the car and the rear left wheel also seems to skip. I have had it into the Stealers 4 times and even tried different Stealers and all say the same ( we have done a diagnostic and nothing is coming up) can no one actually check these things. any way all the expert mechanics on Faceache say the shockers are shot and need replacing, Could this be true. It`s only done 9200 miles and has done this since new..

 

Andyc

[spicyhotone]

I have this too (PHEV) and find it pretty unnerving.

[nlee]

Mine too (PHEV), albeit only happens occasionally dependent on conditions. Don't think it's a fault more a design or maybe over sensitivity.

[Hayzee]

I've had the TC light come on once in 7 months and it happened very briefly when I traversed a small pothole in the road and the rear wheel must have slipped a little. Assumed that was how it should respond.

[ernieb]

Yep, been reported before and especially noticeable if there is even slightest of a loose surfaces. I’ve really been caught out when pulling up at a weathered junction particularly if it’s rained and dried and the junction has gravel and dips in the surface. The brakes really seem to snatch and grab. I guess Toyota would call this a characteristic rather than a fault.

I’m never really steaming into a junction so is manageable most of the time but unsettling the first time it happens.

[philip42h]

I get the traction control light flickering every time I leave home - single track road, steepish downhill, plenty of potholes and loose gravel. I've never had any braking 'inconsistency' in this car.

In a previous RAV, on the way home from work (so a while ago now) at the approach to a particular roundabout - so under braking - it would almost invariably fire the ABS when crossing an expansion joint in the road. I got so used to that that I would release the brakes just before I reached it and reapply them afterwards ... 😉

[NASY]

Had the same thing, not only in the RAV but many other cars. Seems to me to be a character of the system and once used to it's not really an issue for me.

[APS]

This happens in both Toyota and Lexus models whenever you drive over a dip/hole in the road while breaking, the ABS kicks in. It detects a wheel locking up and consequently releases brake pressure. Hence, it gives you the sensation that the car is ignoring your braking effort if only for a fraction of a second. As designed.

[ernieb]

I think Nick first reported this awhile back and he has the PHEV, maybe this model is more likely to exhibit the issue?

[Andyc1219]

Thank you for your replies i have been thinking all sorts of things and wondering if it`s the Stealers fobbing me off, But thanks i`m not the only one then, Quite where the shockers are shot comes into it god only knows. I`m not a fan of this car but as it`s a Motability car i only have 18 months of it left and can`t wait to get rid of the damn thing.

 

[Lawnmowerman]

Also happens to me at a particular roundabout where the approach is a broken surface. I am not a heavy braker and try to anticipate rather than react.

It can be quite unnerving.

Never experienced this on any other vehicle including my 4.4 Hybrid.

[Cyker]

That's kinda weird; I've never had a car with traction control before but it's tuned very well in the Mk4 so I'm surprised to hear it's so disconcerting in the RAV4!

There's a corner I use to test tyre traction - It's quite treacherous as it's an acute right-turn onto a fast road, and rubbish tyres will often give a lot of wheel-spin, requiring me to quickly back-off the power, but I've floored the Mk4 through that corner and the traction control has handled it seamlessly, naturally and stably; I've even felt it torque-vectoring the power to pull me round! It's very confidence-inspiring.

It might be worth e-mailing Toyota to try and get them to investigate, as what's being described doesn't sound like the way it should operate...

 

 

[ernieb]

It certainly seems to be a characteristic of the PHEV when the is a broken or loose surface. Other than that I find the car handles extremely well generally and with a lot of confidence on corners and as such it's interesting to set the MID up to see the energy being transferred into each wheel, there is a real dance going on at times.

[Lawnmowerman]

22 hours ago, Cyker said:

That's kinda weird; I've never had a car with traction control before but it's tuned very well in the Mk4 so I'm surprised to hear it's so disconcerting in the RAV4!

There's a corner I use to test tyre traction - It's quite treacherous as it's an acute right-turn onto a fast road, and rubbish tyres will often give a lot of wheel-spin, requiring me to quickly back-off the power, but I've floored the Mk4 through that corner and the traction control has handled it seamlessly, naturally and stably; I've even felt it torque-vectoring the power to pull me round! It's very confidence-inspiring.

It might be worth e-mailing Toyota to try and get them to investigate, as what's being described doesn't sound like the way it should operate...

 

 

The subject title is wrong.

This is not Traction Control i.e. preventing wheel spin on acceleration.

It is A.B.S. preventing wheel lockup under braking.

[Nick72]

I think the abs is both too eager to engage and is too late to disengage (latency). Noticed this nearly a year ago when I got the car. Roundabouts were a problem on approaching them, braking, and the car rolling forward too far. Should be an easy software fix. Just needs easing off the sensitivity and shortening the engagement period which will be there to prevent bounce between engagement and disengagement (deliberately introduced hysteresis). I might fix it myself if I have time over Christmas. 😂  It's not exactly a space shuttle from a fix and mod perspective. Have reverse engineered far more complex machines in the distant past.

Still haven't managed to get the ABS recall sorted. Need to book it in for the second time since Leroy or someone wasn't in last time and the other technicians couldn't sort it. Tried and failed.

Was hoping that they may have tweaked the software.

 

Edit... I don't know whether this is ABS or traction control. But both may be one and the same solution. The car is trying to keep the wheels rolling rather than skidding so that puts it towards ABS functionality.

[spicyhotone]

I've had the ABS recall applied, and it's made no difference in this behaviour (not that I expected to from what I understood it was addressing!)