Toyota Sienna 2002 intermittent cat efficiency code


#1

My 2002 Sienna has had the intermittent cat efficiency failure off and on (well, I said intermittent, heh, heh) over the years. In the past, I have posted on this topic, and smart folks here said there was new software which solved this problem in many cases.

I asked Toyota in Pharr a couple years ago about flashing it to the new engine computer version. The service writer told me I would need a new computer and it would cost $800, which I believe is considerably more than flashing would cost.

I just looked up the Service Bulletins for that car, and found TSB-0064-10 which says as follows:

Service Bulletin No.: TSB-0064-10
Component(s): ENGINE AND ENGINE COOLING
NHTSA ID Number: 10034284
All Products Associated with this Service Bulletin expand
Details close
0 Associated Documents
Manufacturer: Toyota Motor Corporation
SUMMARY:
TOYOTA: TECHSTREAM ECU FLASH REPROGRAMMING PROCEDURE. FLASH REPROGRAMMING ALLOWS THE ECU SOFTWARE TO BE UPDATED WITHOUT REPLACING THE ECU. FLASH CALIBRATION UPDATES FOR SPECIFIC VEHICLE MODELS/ECUS ARE RELEASED AS FIELD-FIX PROCEDURES DESCRIBED IN INDIVIDUAL SERVICE BULLETINS. MODEL YEARS FROM 2001-2011. *PE

Another page said it was implemented in 2010. And, the ‘All products’ on this page said the SB covers Sienna 2001 through 2011.

Do I read this correctly? If so, I want to take it in and have it flashed to solve this problem. But, if I am reading it wrong I don’t want to look stupid.


#2

I found this while following the link on the exploding air bag thread to see if my car was on the recall list. Apparently not.


#3

Its not a reflash but a new ecu for that year. tsb eg 047-05 your tsb is obsolete


#4

The confusion for me is your document which says to replace the computer was dated 2005, and the document which says it can be flashed is dated 2010. So, I am confused how a 2005 document can obsolete a 2010 document.

However, at least the topic is correct, which was my concern. I guess I will go into Toyota and talk to them when I get back now that I have some confidence that I read it correctly.

Since it requires another device to flash it may come down to whether the dealer prefers to sell $800 computers or to flash the existing one which would require the purchase of a techstream programmer.


#5

http://media.fixed-ops.com/toy_servicebulletins/sb0064t10.pdf is the SB details. Note 2010 date. I am still not clear that this would pick up the spec change for P0420. But, I have seen others talk about flashing the computer to fix that problem.

I will be traveling to the Midwest. If McAllen can’t do it, I will ask again in the Midwest.

Or, maybe call Toyota offices and see if they can find a dealer who can do it.


#6

TSB-0064-10 was replaced by T-SB-0012-13 REV1, the revisions just add model years to the bulletin. This bulletin is just a general guide to the software update procedure. There must be software revisions that apply to your PCM for this to be possible. The software revisions will be shown as a link in the specific service bulletins. Each bulletin with a software improvement for you vehicle involves replacing the computer, I don’t see any software flashes.

The next time you are at the dealer ask them to do a computer “health check”, ask for the print out. This only takes a few minutes and will show if any software updates apply to the computers in you vehicle.


#7

The tsb you refer to is a generic reflash procedures. The one I posted is for your specfic concern of P0420. Your year will require the ecm to be replaced.