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OBD 2 mode 6 failed tests
08-19-2017, 03:42 PM
Post: #1
OBD 2 mode 6 failed tests
Hi,

Got a 1 year old Hilux that fails two mode 6 tests.

You can see the tests here https://www.dropbox.com/s/5gvwna9uc42lj0....html?dl=0

But in short what the tests says is
Current value min max
$31 - EGR Monitor Bank 1 TID $B9 - Manufacturer Defined 0.25 100.01 655.35 kPa Fail
$B2 - PM Filter Monitor Bank 1 TID $82 - Manufacturer Defined 63.0617 255.9928 255.9928 Fail

Any ideas? It's a diesel, with a dpf filter, has to much soot in the exhaust pipe according to another tech i showed a picture. It started to use a lot more fuel quite some time ago, went from 6.5-7.3 to 9.5-1.4 liters per 10 swedish miles.

Any help would be great as the local toyota tech seems to be completely incompetent and says there is no problems.
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08-19-2017, 09:31 PM
Post: #2
RE: OBD 2 mode 6 failed tests
What I see from the information provided is the following:

"There are no pending, stored, or permanent diagnostic trouble codes"

What this tells me is there are no serious issues, but further down I find the other things which may mean something needs routine maintenance. Seeing at the vehicle is fairly new, you should look into what is on the normal service schedule and get that done before jumping to any conclusions. You may also want to discuss any warranty issues with the dealer before spending too much of your own money. A one year old vehicle should be able to pass an inspection.

BTW, since this is a non-USA model that we have no first hand experience with I can't give you much more in the way of details.

Let us know how you make out as it may help others reading here.
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08-20-2017, 03:21 AM
Post: #3
RE: OBD 2 mode 6 failed tests
Thanks Rupe,

I spoken to the dealer i bought it from which is not the local one. They are going to look into it and it is getting it's regular service down there too at the same time.
From my limited knowledge i think what is happening is that the map sensor is faulty somehow and because of that it injects to much fuel in the engine so that is also why there is soot in the exhaust.
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08-20-2017, 11:13 AM
Post: #4
RE: OBD 2 mode 6 failed tests
There are several items that can change injection rates (read: fuel mixture ratio) but I didn't see anything special in that diagnostic report. Normally a bad MAP sensor would show up as out of range (too high / low) or set a code and lead us toward a possible repair, but none are there. Personally I'd be leaning toward a temp sensor that's not reading correctly because the ECM may see 32F (0C) temp and that would not trip a code but we'd obviously know that's not correct in the summer.

BTW, it's interesting to note how this world market for vehicles is slowly making things similar between countries, although surely not as stringent as our California emissions standards or as cranky as our high altitude vehicles were years ago. OTOH, I did have to look up the Swedish mile. That was a new one on me!
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08-20-2017, 05:45 PM
Post: #5
RE: OBD 2 mode 6 failed tests
(08-20-2017 11:13 AM)Rupe Wrote:  There are several items that can change injection rates (read: fuel mixture ratio) but I didn't see anything special in that diagnostic report. Normally a bad MAP sensor would show up as out of range (too high / low) or set a code and lead us toward a possible repair, but none are there. Personally I'd be leaning toward a temp sensor that's not reading correctly because the ECM may see 32F (0C) temp and that would not trip a code but we'd obviously know that's not correct in the summer.

BTW, it's interesting to note how this world market for vehicles is slowly making things similar between countries, although surely not as stringent as our California emissions standards or as cranky as our high altitude vehicles were years ago. OTOH, I did have to look up the Swedish mile. That was a new one on me!

When i run the toyota tech stream this one $31 - EGR Monitor Bank 1 TID $B9 - Manufacturer Defined 0.25 100.01 655.35 kPa Fail is the one tech stream says is the map sensor, the pressure is way below what it should be, 0.25 when lowest should be 100.01

However you are the second person to say the computer thinks it's cold outside. Unless you are the one who replied on reddit as well Big Grin
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08-20-2017, 11:23 PM
Post: #6
RE: OBD 2 mode 6 failed tests
MAP sensor is possible so double check any vacuum lines and then the sensor itself by whatever the book calls for. My best guess (not up on electronic diesel) is to use live data from a scan tool to see if the MAP readings change with throttle and load. A scan tool will also give you temp readings for both engine coolant and ambient air so you know what the ECM is working with.

No, it wasn't me in the other forum, but temp sensors are a problem I have seen many times over the years.
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