threepot

2011 Dcat White smoke problem

Recommended Posts

I thought I would document my experiences with this issue here for others to see.

My 2011 Rav4 Dcat Automatic has a little problem, once it is warm after driving a couple of miles, when I accelerate from standstill in slow moving traffic I get quite a large cloud of white/grey smoke behind me. The sort of cloud that makes people stay further back as it smells like a dirty diesel.

The vehicle has 60,000 miles almost bang on.

The Oil and filter is clean as I changed it last weekend.
I fitted a new diesel filter at the same time.
I have Toyota Techstream diagnostic software running as I specialise in auto electronics as my profession.
There are no fault codes on any of the vehicle systems.
The injector coding is all programmed correctly.
The injector correction/cylinder balance values are all within a "reasonable specification"
Although 1 injector is showing nearly -2 trim while the others are +0.1 to +0.8 which could be showing that 1 injector is losing its spray pattern.
It runs and drives perfectly (except for the smoke)
I have performed the fuel pump learn function, and the injector balance trim function, I have reset the crank angle learn values.
The DPF shows normal pressure readings and does not appear to be clogged with soot.

Tonight I made a little EGR blanking plate, wondering if it was swallowing too much of its own exhaust gasses - this has not resolved the smoke 😞

An I have just performed the Engine ECU software calibration update as highlighted in TSB:-
EG-0096T-1011 "08-AD engine: Intermittent white smoke is coming from the exhaust. ALA30,ALA35"

Before the update my engine ECU 895364201000 was running version 342B0400 and now it has been updated to 342B0600

To perform this update I downloaded the CAL download from here via my VIN number https://www.toyota-tech.eu/CAL/VINDecode.aspx

Then I used Toyota Techstream in J2534 passthru mode using a Ford VCM2 interface that I have.

Attached are pictures of the update before and after.

If this solves the problem I will post back to let other owners know this potential solution.
Otherwise my next plan of attack will be to blank off the 5th injector fuel feed to see if this is the cause of the issue.

If anyone has any suggestions or feedback I am all ears 🙂

 

toyota update after.png

toyota update.png

Share this post


Link to post
Share on other sites
 

Did the problem start out of the blue or has it been apparent for a while? It will be interesting to see if loading the software in the TSB solves the problem. It’s sometimes useful to wire something up to indicate when the 5th injector is being energised in order to ascertain if this is happening when not expected, and to see if it ties in with smoke emission.

Share this post


Link to post
Share on other sites

I think it might be caused by a poorly sealing 5th injector nozzle. When the vacuum flap closes under low load conditions I wonder if the induced vacuum causes diesel to seep past the seal in the 5th injector - but only once its been used a couple of times after the warm up period (a few EGR + 5th injector cycles)

In all fairness I don't know how long this has been like this, I've only owned it for a good few months, then I only do long journeys late at night when there is no traffic and dark so I wouldn't see the smoke. During the day I only drive it for very short journeys. Because I have a few different cars to use the Rav4 is often at the end of the list.

I think you can see the 5th injector in the live data, but I will look later. This is all a solvable issue, it just needs a bit of tinker time.

Share this post


Link to post
Share on other sites

Just come back from road test - the software update has not cured the smoke problem !!! 

Share this post


Link to post
Share on other sites

I have removed my EGR blanking test plate which did not highlight the issue:-


20181130_104137.thumb.jpg.05f13fdfcab68ebb4192ed7e257dcdbe.jpg20181130_104104.thumb.jpg.0e4b734dbe875367403b78b01d9bd336.jpg

 

I have clamped off the fuel feed for the 5th injector with a brake hose clamp:-

20181130_104850.thumb.jpg.cde69ae85483077b3ed5501f0b7a5471.jpg

I will road test again when I have time and report back.

Share this post


Link to post
Share on other sites

There are 3 values in the live data blocks  which I think are to do with the 5th injector.

20181130_172424.jpg

Share this post


Link to post
Share on other sites

So I decided to undo the 5th injector clamp, but keep it in position ready to clamp off the 5th injector if I see smoke again. Then I will know the cause of the smoke.
And if I never get the white smoke then the software update may be the answer.

Part of me wonders if its to do with the DPF regen cycle.
The other day when it was smoking, I had just done a "between towns A road" type drive at a steady 55mph.
Then I hit stop start traffic as I came into town.

The other day with the big clouds of white smoke; I wonder if it had started a re gen burn off cycle, but been caught short as I hit the slow moving traffic.

Other people have complained about this issue I can see on the internet, I wonder if their vehicle has some underlying issue which is causing it to keep trying to regen the DPF.

I've had no smoke this afternoon and tonight what so ever ??? Only time will tell. Make of that what you will!

Other brands of car terminate the DPG regen process as soon as the road speed goes below 60km/h.
I've done loads of weird DPF issue jobs over the years, but I rarely get any Toyota's in to fix as they don't really go wrong. It's usually European cars with these sorts of issues. So my experience of the details of the systems operation is somewhat lacking.

Share this post


Link to post
Share on other sites

Indeed I have this!  Totally puzzled though, as is Toyota. My new software update is 342E7000.  That's on a 2ADFHV engine though.

Share this post


Link to post
Share on other sites

800 miles later - still no white smoke 😱

Share this post


Link to post
Share on other sites

Hi, White smoke usually indicates unburnt/excessive fuel. Black smoke Air/Fuel mix. Blue smoke, you#re burning Oil. By your own diagnostics, it would seem like a duff injector (No 5). try swapping injector 5 with known good one. 

Share this post


Link to post
Share on other sites

1 hour ago, Bomber209 said:

Hi, White smoke usually indicates unburnt/excessive fuel. 

or DPF regen

Share this post


Link to post
Share on other sites

Regenerating / burning out a DPF should not result in white smoke if operating correctly.

Share this post


Link to post
Share on other sites

The D-CAT is a DPNR equipped engine though rather than a conventional DPF. You might want to look at 

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now