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Where exactly is the TCU?

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    #1

    Where exactly is the TCU?

    Problem: S-light stays solid once I turn the car on. When this happens, the car is stuck in 2nd Gear. Manually shifting to D1-4 will do nothing.

    Occasionally, the S-light will blink (instead of being solid) once the car is turned on. When this happens, the car is stuck in 3rd Gear when in D4 and D3. However, manually shifting to D1 and D2 will put the car in 2nd Gear.

    So when the light is blinking I have no trouble driving the car via manual shifting. However, when the light is solid, I can't take the car on the highway b/c its stuck in 2nd.



    could someone explain the easiest way to get to my TCU? I want to get the model number because me thinks it needs replacing. I have a sports shifter button crap...so that should be fun, finding the correct TCU.


    also, is there any value that can be had if I remove and clean the lock-up[#7] and shift[#5] solenoids


    I had this problem before and cycled out the tranny fluid (via drain/fill/drain/fill/drain/fill/drain/fill) and replaced a whole bunch of other tune-up parts and the problem went away for at least 4 months. But now its back and pissing me off because I know I've got another 50k on this baby.

    Thanks for any help you can provide.
    Last edited by OptimusPrimeSr; 07-11-2007, 03:55 PM.
    91 EX F22A4 - Stock w/ 220k mi
    My Ride - 12/06
    Tags: None
    #2
    The tcu is that module on the right. It's under the passenger side carpeting. There is a shield covering both of them (ecu and tcu), you remove that and the ecu/tcu are bolted to the back of it. It's kind of a pain, but its do-able.

    on the stairs, she grabs my arm, says whats up,
    where you been, is something wrong?
    i try to just smile, and say everything’s fine.

    Comment

      #3
      Originally posted by OptimusPrimeSr
      Problem: S-light stays solid once I turn the car on. When this happens, the car is stuck in 2nd Gear. Manually shifting to D1-4 will do nothing.

      Occasionally, the S-light will blink (instead of being solid) once the car is turned on. When this happens, the car is stuck in 3rd Gear when in D4 and D3. However, manually shifting to D1 and D2 will put the car in 2nd Gear.

      So when the light is blinking I have no trouble driving the car via manual shifting. However, when the light is solid, I can't take the car on the highway b/c its stuck in 2nd.



      could someone explain the easiest way to get to my TCU? I want to get the model number because me thinks it needs replacing. I have a sports shifter button crap...so that should be fun, finding the correct TCU.


      also, is there any value that can be had if I remove and clean the lock-up[#7] and shift[#5] solenoids


      I had this problem before and cycled out the tranny fluid (via drain/fill/drain/fill/drain/fill/drain/fill) and replaced a whole bunch of other tune-up parts and the problem went away for at least 4 months. But now its back and pissing me off because I know I've got another 50k on this baby.

      Thanks for any help you can provide.
      Kick out the autotranny! Get a manual. Once you start getting problems with the tranny they will keep returning. I had mine repaired 4 times till it broke down again and now I'm doing a manual swap.

      Your car is faster, I'm the better driver

      Greetz Erwin
      My last ride

      Shakes and Fidget - The Game




      Comment

        #4
        Originally posted by accordaffair
        It's kind of a pain, but its do-able.

        you weren't kidding. I'll have to wait until the weekend to get a socket that will fit the bolts holding the plate to the base of the car. The screws poke out too far for the sockets I have.


        edit: and I tried the paper clip thing to get the codes (againnnnnnnnn)...no dice. The s-light stays solid.
        91 EX F22A4 - Stock w/ 220k mi
        My Ride - 12/06

        Comment

          #5
          Originally posted by lo-specials
          Kick out the autotranny! Get a manual. Once you start getting problems with the tranny they will keep returning. I had mine repaired 4 times till it broke down again and now I'm doing a manual swap.

          no tranny swap...but I will be purchasing a manual once this one dies.
          91 EX F22A4 - Stock w/ 220k mi
          My Ride - 12/06

          Comment

            #6
            yeah it needs a deep socket 10 mm, lowes sells single sockets.

            And the paperclip trick should work. You'll know you're doing it right if the CEL blinks. If the S still stays solid, I believe that indicates a dead tcu.

            on the stairs, she grabs my arm, says whats up,
            where you been, is something wrong?
            i try to just smile, and say everything’s fine.

            Comment

              #7
              Originally posted by accordaffair
              yeah it needs a deep socket 10 mm, lowes sells single sockets.

              And the paperclip trick should work. You'll know you're doing it right if the CEL blinks. If the S still stays solid, I believe that indicates a dead tcu.

              does the board have a general consensus (that can't be spelled right...) about where to pickup a new TCU?

              Also, since mine is a 91'EX (w/ the stupid sports button on the shifter), is there anything I need to look out for as far as models of TCUs that won't work with my car?
              91 EX F22A4 - Stock w/ 220k mi
              My Ride - 12/06

              Comment

                #8
                Theres a model number on the tcu, match the new one to that. And I would go to a junkyard or ebay, or forum classifieds for the most part.

                on the stairs, she grabs my arm, says whats up,
                where you been, is something wrong?
                i try to just smile, and say everything’s fine.

                Comment

                  #9
                  Originally posted by accordaffair
                  Theres a model number on the tcu, match the new one to that. And I would go to a junkyard or ebay, or forum classifieds for the most part.
                  Thanks for your help. I'll pull that little terd out this weekend and grab the number.
                  91 EX F22A4 - Stock w/ 220k mi
                  My Ride - 12/06

                  Comment

                    #10
                    Originally posted by OptimusPrimeSr
                    Thanks for your help. I'll pull that little terd out this weekend and grab the number.

                    had some spare time today.

                    from the sticker...
                    AT CONTROL UNIT
                    28100-PXO-832-M1
                    3LZ

                    OKI telecom
                    LOT. NO. 0x24U


                    why do I need a password to look at the classified? How do I get one?


                    edit: btw, I disassembled the TCU and checked the circuit board and everything looked flawless. I have all the records for this car and this part has never been replaced. still worth it to shell for a new one?
                    91 EX F22A4 - Stock w/ 220k mi
                    My Ride - 12/06

                    Comment

                      #11
                      Reading is fun. ^^/
                      AIM :Korax37

                      1992 Accord EX Manual sedan - Stock
                      1989 Civic DX Hatch - JDM SiR1 B16a

                      Comment

                        #12
                        replacement TCU came in (ordered off ebay). Car is running like a dream !!! very stoked...thanks for the help all!
                        91 EX F22A4 - Stock w/ 220k mi
                        My Ride - 12/06

                        Comment

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