[mrscullini]

Well with your cable at least you should be able to get it running well. I would say though, if you plan to take it to the dealer, they may not work on it under the TSB unless it's exhibiting the symptoms and has the high alcohol %. No harm other than you might have to wait for a while for it to climb back up before you take it in. Be careful with techstream... I hear you can muff things up if you don't know what you're doing.

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thanks. good to know about techstream, i'll proceed with caution. plan to read through the techstream thread here.

figured if i reset it, it might take a while for the symptoms to return. i get concerned about that much raw fuel being pump through the motor and cats at start up.

 

[jmansouri]

Check the years and mileage of the tsb to make sure you don't exceed that and have to foot the bill for the fuel pump/install.

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[mrscullini]

Check the years and mileage of the tsb to make sure you don't exceed that and have to foot the bill for the fuel pump/install.

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thanks, will do. do you happen to know the tsb number?

 

[jmansouri]

Not off hand. Check the various posts... If you can't find it I'll try to dig it up.

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[mrscullini]

Not off hand. Check the various posts... If you can't find it I'll try to dig it up.

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thanks. i'll search the forum and report back.

 

[mrscullini]

well, i found it. T-SB-0166-19

here's the warranty info,

APPLICABLE WARRANTY • This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.
• Warranty application is limited to occurrence of the specified condition described in this bulletin.

of course, i'm at 82k. rat bastards.

looks like i may be paying for pump replacement.

 

[jmansouri]

I would try it anyway... They "might" do it goodwill... Also try multiple dealers if one won't. That pump isn't cheap nor is the labor to drop the tank etc.

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[mrscullini]

I would try it anyway... They "might" do it goodwill... Also try multiple dealers if one won't. That pump isn't cheap nor is the labor to drop the tank etc.

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will do, thanks.

can't imagine it is cheap. had to do it last year for my volvo wagon. it was about $1800 for pump and labor.

 

[mrscullini]

i was able to get techstream installed and working. reset/relearned the ethanol content. so far with a dozen or so drive cycles and maybe 100 miles, the reading is staying at 0.

 

[jmansouri]

Have you fueled up with at least 5 gallons? That's what triggers the learn...

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[mrscullini]

Have you fueled up with at least 5 gallons? That's what triggers the learn...

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i haven't, i had basically a full tank at the time. i can do that today and see what happens.

 

[jmansouri]

Make sure the truck is warmed up and when you fuel up make sure the key is out of the ignition. I suspect it will stay at zero for a few fuel cycles at least. That's what mine has done anyway

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[mrscullini]

Make sure the truck is warmed up and when you fuel up make sure the key is out of the ignition. I suspect it will stay at zero for a few fuel cycles at least. That's what mine has done anyway

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will do, seems simple enough.

so crazy what a convoluted fueling process this thing needs.

 

[jmansouri]

I agree. Even when I have followed the instructions.... Sometimes it doesn't appear to be "analyzing the fuel" ... But the only way to actually tell is when you see the numbers moving. So maybe it's testing without adjusting. Who knows for sure

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[mrscullini]

I agree. Even when I have followed the instructions.... Sometimes it doesn't appear to be "analyzing the fuel" ... But the only way to actually tell is when you see the numbers moving. So maybe it's testing without adjusting. Who knows for sure

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noted and thanks. i'll report back after refueling and a number of mile/drive cycles.

 

[Powertechn2]

I will say one thing.


The last reset of the ethanol % by the dealership locked the truck at 0%, when it should have been reading 7-8%

Eventually the ecu can lock itself out of reading after enough resets. At least that's what was explained a few years ago.

On my 2010 flex, it would always read 7-8%, which coincidentally matched the ethanol % from actual fuel tests I had done.

 

[jmansouri]

I'd be fine with a lockout...I never plan to use e85. The question is does the ecu make fine adjustments to the fuel trims based on this number or is it more of an on off type thing, ethanol or no ethanol. So would there be any negative effects reading zero while burning "E 10". It seems people are fine until they hit the 70% +/- so I wonder how much adjustment is made throughout.

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[Powertechn2]

I'd be fine with a lockout...I never plan to use e85. The question is does the ecu make fine adjustments to the fuel trims based on this number or is it more of an on off type thing, ethanol or no ethanol. So would there be any negative effects reading zero while burning "E 10". It seems people are fine until they hit the 70% +/- so I wonder how much adjustment is made throughout.

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That is a good question. I don't have a concrete answer, unfortunately.

I can say that my mpg on the 2017 when it was locked at 0% was decreased from prior to having issues. It was also decreased more so when the truck would start climbing, say 35-45% it was noticeable.

I don't put enough miles on the truck now to really tell, and short trips means mpg is never great anyways. I also need to get a new obd2 reader since my last one is mia, so I can see if it's reading 0 or 7-8% like it should be. I had the pump and reflash about a year ago.

 

[Wa'Tundra]

New to Tundras and new to the forum.

2016 FFV TRD. Bought it in May last year. The fuel pump was replaced in Dec 2020 and the ECU reflashed. Still having a high alcohol percentage. It reads 67%. Experiencing the hard start issue. How many owners have had to have the ECU flashed multiple times? Are there any other solutions?

I've heard Techstream is required for a reflash. I've seen them available on the web. Are these worth picking up and would it allow a reflash of the ECU for this issue?

I own a 2012 Tundra CrewMax FFV 4x4 with 248000 miles when I experienced a 1-3 start attempt with a long start and starter staying engaged when I returned the key back to the acc position. I visited several forums as well as YOUTUBE. On YOUTUBE I came upon a Tundra owner of a more recent model than mine that was also FFV experiencing the same issues as I. I initially thought my starter was going out, I R2 the starter and that did not fix the issue, costly miss diagnosis, whereas others sought the dealership recommendation of fuel pump R2 flashing of the ECU and even that did not fix the issue. The YOUTUBE person performed a thorough investigation of his issues which also involved the alcohol percentage or something to that effect along with where and when the issue arrived and where he refueled at that time. He also was experiencing the problem during colder weather temps, which brought an interesting point about summer and winter gas properties. I do believe he never used E85 fuel either. He mentioned of placing non-ethanol fuel in his Tundra to see if that would change the properties of the fuel content which may correct the problem of the sensor in the fuel pump readings. It appeared to have worked for him. I followed suite in doing the same thing, so far that is working for me there is a small noticeable infraction every now and then but nothing requiring no more that one attempt to start. I feel that there is no need of changing the fuel pump nor reflashing the ECU. The fuel sensor located in the fuel pump is doing its job as well as the ECU, once the correct fuel properties are restored eventually the sensor is going to recognize it and work accordingly. It may take a couple of fuel tanks of the correct fuel to go through the fuel system in order for things to get the correct reading. I am pretty sure it is cheaper than what the dealership has/will charge for all they are going to do and you still have the same issue. Also consider if you are to change out the fuel pump, is the non FFV and FFV fuel pump interchangeable if so opt for the non FFV pump instead. IF you would take a moment and conduct a search on the YOUTUBER with fuel/starting issues you may find his article interesting to what you may be experiencing. Looking at the date when this was posted hopefully you have had this issue fixed.