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Need help with Auto-transmission troubleshooting

Discussion in '1st Gen. Tacomas (1995-2004)' started by 2003t4co, Apr 14, 2012.

  1. Apr 14, 2012 at 5:19 PM
    #1
    2003t4co

    2003t4co [OP] Member

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    My 2003 tacoma SR5 3.4 4x4 V6 auto-transmission is throwing fault code P0741-Torque Converter Clutch Solenoid Performance Stuck off. Following the FSM manual, I determined that the solenoid SL is normally open when de-energized, and closed when 12v is applied. I found that my SL solenoid was exactly opposite of what the FSM manual said. Should I risk buying a new solenoid?

    PREPARATION:
    (a) Remove the oil pan.
    (b) Remove the shift solenoid valve SL.
    CHECK:
    (a) Apply the 490 kPa (5 kgf/cm2, 71 psi) of compressed air
    to check that the solenoid valve does not leak air.
    (b) When battery voltage is applied to the shift solenoid
    valve, check that the solenoid valve opens.
    OK:
    (a): Solenoid valve does not leak air.
    (b): Solenoid valve opens.

    What type of transmission do I have? A340E or A340F. I found online that A340E uses normally open solenoid?

    Here's a picture of my valve body
    [​IMG]
    Did I take out the correct solenoid?

    Thanks in advance.
     
  2. Apr 14, 2012 at 5:24 PM
    #2
    NelsonTacoma

    NelsonTacoma This is my derpawayinator!!!!!

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    Sounds like the solenoid is bad to me. If you want to know what transmission you have just look at the GVWR sticker inside you drivers door jamb, it should be printed on there somewhere.
     
  3. Apr 14, 2012 at 5:32 PM
    #3
    2003t4co

    2003t4co [OP] Member

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    Thanks NelsonTacoma,
    Just checked my door, I have a A340F. It still doesn't make sense to me how the solenoid would reverse, i.e. normally open, no power applied, and then close when power is applied. I double checked the polarity of my wires also.
     
  4. Apr 14, 2012 at 5:34 PM
    #4
    4WD

    4WD cRaZy oLdmAn

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    1st gen 4x's are the A340F
     
  5. Apr 14, 2012 at 8:57 PM
    #5
    4WD

    4WD cRaZy oLdmAn

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    Theres a relay switch before the solenoid, & it determines the value of the device i.e; normaly open/normaly closed, some solenoids close halfway when they fail which opens another can of worms when troubleshooting
     
  6. Apr 14, 2012 at 9:13 PM
    #6
    G scott04

    G scott04 ...

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    I know its too late too avoid dropping the pan now but check all your sensor connections, i got that same code because i didn't have one of the plugs back together after I put the transmission back in....
     
  7. Apr 28, 2012 at 10:37 AM
    #7
    2003t4co

    2003t4co [OP] Member

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    Just to let everyone know, I replaced the shift solenoid valve SL and I am still getting the check engine light. The FSM procedure is wrong, the picture however is right. So for future references, solenoid SL is normally open, and closes when 12VDC is applied.

    Still troubleshooting, any advice or help is appreciated.

    Thanks
    [​IMG]
     
  8. Mar 9, 2013 at 8:02 AM
    #8
    cruiseroutfit

    cruiseroutfit Well-Known Member

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    Any update? What did you end up doing to resolve the code?

    I too was (am?) dealing with the P0741 and stumbled across the apparent FSM solenoid check procedure error. I was able to get Toyota to let me borrow a new solenoid for a few days to test against my old solenoid. As the solenoid operation 100% matched that of the new solenoid albeit opposite of the FSM, and my valve body checked out so we pulled the torque converter and had it rebuilt with beefed up friction material. Buttoned it back up yesterday and gave it a quick test drive, so far so good?
     
  9. Mar 11, 2013 at 12:45 PM
    #9
    2003t4co

    2003t4co [OP] Member

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    Hey, sorry I couldn't get back to you in time, but I think the O-rings on the solenoids were worn and could not hold the pressure when solenoid 3 is closed. Anyways, for contribution towards the future, SOLENOID VALVE SL CLOSES WHEN 12V IS APPLIED!!! I paid justanswer.com for an answer and it was wrong, should've got my money back.
     
  10. Mar 11, 2013 at 12:46 PM
    #10
    2003t4co

    2003t4co [OP] Member

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    I bit the bullet and took it in to a shop, and I got RAPED for a rebuilt costing $2,700.
     
  11. Mar 12, 2013 at 7:51 AM
    #11
    cruiseroutfit

    cruiseroutfit Well-Known Member

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    Thanks for the update. My solenoid o-rings were tight and clean so I'm not sure that is my problem? Thanks again!
     
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