06 DC tundra A750E trans code P0756..

.. As my wife finally took the toy for a test drive after installing new muffler system from resonator to after rear wheel which was easy, I finally see the codes for the 06 and 1 that stands out is the P0756 which is shift solenoid 'B' or 'S2" which is it ?? WELL seems they are 1 in the same.

SONNAX has it as this ( have to see the S2 provision for the 7 solenoids valve body ) https://www.sonnax.com/tech_resources/224-toyota-a750e-a761e-identification-guide

SONNAX OHMs list per solenoid
https://www.sonnax.com/tech_resources/375-toyota-lexus-a750e-f-solenoid-identification

Do I have to remove the valve body to do the solenoid swap ?

EDIT = Can I take all solenoids out without removing valve body to check them?

Thanks, Steve

 

As I have thought about this since posting this yesterday, is there any wiring diagrams for the transmission plug pin out ?
I will do a internet seach for a schematic, but figured since someone had possibly needed a shematic one would be avaliable here

Side note is, I will do a OHM test from plug into transmission before pulling pan etc, this will for sure ( maybe ) pin point the issue is the S2 solenoid before pulling pan and I can check all for correct Ohms' and get the solenoids that may be ready to go out of spec to say.

 

Should be, in the source of all iour community nformation. Download your wiring diagram and factory service manual, right around line #6 in the 1st reply of this thread: https://www.tundras.com/threads/so-you-wanna-buy-just-bought-a-1st-gen-tundra-eh.115928/

 

In that link shift is pointing out is a link to the 05-06 FSM which has numerous test points/procedures when needing to check transmission parts like the solenoid.

 

Also, here is a link to the A750E/F Repair Manual

 

AWESOME INFO posted above, After going through the .pdf files I FINALLY found what could be a test to find what the transmission is doing. This is what I will do to test the malfunction S2 solenoid, in the .pdf file ( 05-06 Tundra FSM.pdf ) on page 1409, I will do this test to find if the electrial curcuit is bad and it will be a test to find if the internal of the transmission is functioning per the description of the road test.

This involves un-pluging the transmission connector and leaving it off for the quick road test, have to shift through the gears manually from L/2 all the way through to 4th/OD, ( in which OD will not work since the connecter is disconnected to signal OD on or off ), as if it was shifting on its on. Then down shift to find if 'engine' brake type seranaro happens as you slow down, pull it down 1 gear at a time to get back to L/2 as speed reduces to come to a complete stop, again start off in L/2 again and shift manually all through the gears, by time you get back to home base use the down shift ( engine brake ) as you reduce speed while using brakes to find if shift's are good or bad, though this is at low speed up to maybe 60MPH or so by the manual.

I will do this test tomorrow as thunder storms moved into our area today July 13th 2025,<- just a date stamp.

Thanks, Steve

 

Well after much searching in the 05-06-FSM.pdf ( about 2 hours ) I found the start of the transmission solenoid/s info on page 1472 .

The info before page 1472 is of brake light switch test and on up is more component tests.

The way they have it all listed makes you jump here then there, man my eyes started to cross at 1 point LOL. Also the jump to on pages do not work it will just jump you back to page 1

 

Yeah, your best bet is to search the file for the hyphenated section it tries to redirect you to. You may find some of the sections are purely referential, and not pertaining to the testing you'd need to do.

 

WELL, after more searching in the .pdf I can not find the wire colors from ECM to transmission connector, SO I fired up my AllData ( I truley forgot I still had a local copy ) And low and behold I found the diagram with wire colors and the volatge etc.. . This will definatley help me with what I found in the FSM.pdf, more info the better, attached here for all to have

EDIT = I do have the complete AllData so if anyone reads this and keeps me in mind when needed I can see if AllData has the info if not found easily , sometimes it happens, and ask me and I will happily upload it.

EDIT 2 = I added the color codes for the same, attached for all to have.

EDIT 3 = I added the SONNAX OHM guide ( I hope it is ok )

 

I updated my post above with the SONNAX OHM guide, 3 files total.

 

I wouldn't give up on the 06 FSM nor the EWD that shifty linked to. The first 2 uploads you made are both contained in the FSM and EWD, basically what All-Data is showing.

Diagnostic section of FSM....

 

Like I stated above, when I clicked on the revalant DI-XXX in the PDF it would just put me back to page 1, then I am back to square 1 starting over, then same on any of the links in the PDF. I spent 2 hours trying to look through the PDF, it is a good source for info but for me it was like trying to find a needle in a haystack.

After I realized I still had my old hard drive ( from my work laptop ) with the full AllData I tried it and I was able to find it in 2 minutes.

All the info is awesome like I posted, maybe the .pdf files could be sectioned out ? I doubt it as it looks like it came from a full on 'program' like Alldata and the internal links are truncated within the file which happens when you save a large PDF file out of a program.

Yea a little over some peoples heads to say, but none the less I like Tundras.com, I will help where I can .

 

Yep, didn't catch that and unfortunately that's the way most of the EWD/FSM's that are available for download are to some degree.

Over time I have fixed all of our EWD's and FSM's with Adobe Pro. I have not gone hog wild and fixed the clickable links found on pages but I have fixed the Table of Contents to be properly worded/clickable. Also added an Index like's in the actual paper manual to also make them clickable. Given their 30 to 80 meg in size, don't know how to offer them for download.

 

Yea the FSM.pdf is 4,947 pages so yes I see the issue, I am no PS person, but what is avaliable is truley invaluable.

 

As a side note, I just created 1 of the TDC 'B' code lists and it is 356 MB .pdf

Guess I will use my server for the .pdf files I create