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Auto Trans Wierd Downshift

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    #1

    Auto Trans Wierd Downshift

    I have a 92 LX Auto.
    When I'm driving and slowing to about 30km and when I reapply throttle, it should just downshift to 2nd but it tries to goto 1st gear then before it gets to 1st it jumps to 2nd gear where it should be. That what it feels like to me. This also happen when I turn 90 degree corners and reapply the throttle.
    It's been doing this for a year without getting better or worst.
    I get no CEL codes.
    One thing I notice to is that it short shifts in 4th gear compared to the other gears.
    When I originally had the car it shifted hard, so I put in Honda ATF. Still shifts hard but it's better.
    I took apart the TCU and all the components looks good. No leaking caps or burned resistors.
    The TPS is adjusted to 0.45V at close.
    I check the transmission throttle cable and there is no slack, it moves synchronously with the throttle cable.
    I cleaned the solenoid valve assembly.
    I checked the resistance of the NC and NM speed sensors and are within specs of 400-600ohms. Also pulled them out and cleaned them. the NC sensor had a little bit of metal shavings.
    I noticed when I'm driving highway speeds. The speedometer jumps a little when I hit bumps by +-5km. I don't know if this is normal or not.
    I took the VSS out and everything looks good, but I guess something could be wrong with it.

    I used these forums and http://techauto.bravehost.com/ to try to figure it out the problem.

    When playing around I tried driving the car with the TPS disconnected it shifts around 2500rpm and shifts so smoothly, no shift shock. But the transmission only downshifts according to speed. This gives me some knowledge that the transmission can shift smoothly, but I guess the TCU is designed to shift hard. Just interesting.


    What would you guys recommend. Should I try another TCU or VSS, or could it be something wrong with the transmission itself?

    Thanks,
    Tags: None
    #2
    Damn you got this covered. If there is a way to check the VSS before purchasing it that would be a good start. TCU grabs every gear that should be fine too. Have you tried checking for both ecu and tcu codes?

    Also can you manually shift the car into your selected gears like you know when you want to accl and when you want do Dcclr8. ?

    Comment

      #3
      I'll going to check the VSS tomorrow. I'll hook a DMM to it.
      I get no lights on the dash. But I'll double check if I'm getting a code. But last time I checked I wasn't getting anything. That was before winter.
      Yep I can manually shift the car through all the gears, and downshift with it. When I do it this way it shifts really hard and I don't like doing it.

      Comment

        #4
        Does the D4 light come on when you have it in D4? If not check the part number on your TCU and make sure it's the right one for the car. I had the same issue but my TCU was also fried, but after some investigating having the wrong TCU in there can cause alot of really weird issues.

        Runt

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          #5
          Yes the D4 light come on when in D4. It also comes on when you have the ignition in the on position and then goes away like it should.
          I checked the VSS with a DMM and it pulses from 0.2V to 12V. But according to this website http://techauto.te.funpic.org/transmission.php it says it should pulse from 0V to 5V. Anybody know what it is suppose to be?

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            #6
            well my car shifts hard nw... but i just need a rear motor mount. have u checked that?
            Member's Ride Thread



            Originally posted by deevergote
            Don't forget to cut holes in the box. Someone sent me a dead hooker one time, and that wasn't cool.
            Bought From: AccordWarrior | CB7lx91 | DarkShadow707| Tn_Accords | H23CB7 | Jack_lee | Fatboy1185
            Sold/Gave To: 90goldcoupe | CB7lx91 | Jas_r34 | F20accordturbo | BatmannamtaB

            Comment

              #7
              What am I looking for with the rear mount? I think I might pick up a VSS sensor from the scrap yard, it's only $10 so I've got noting to lose.

              Comment

                #8
                I picked up a VSS sensor and installed it. It seems now the speedometer doesn't bounce when I hit bumps, also it appears to shift smoother, but this usually happens after I reset the ECU then it goes back to a harder shift with time.
                The weird downshift problem still exists though.
                The rear motor mount has a vacuum line hooked so when I decided to unhook it the downshift problem got worst. So I'm thinking that the motor mount probably needs to be replaced.

                Comment

                  #9
                  Just letting you know I installed a new front and rear motor mounts with no change in the way it shifts, or anything, I guess my mounts were fine. I also installed a new ECU and TCU from a F22a6 with no change, and also installed a f22a6 intake manifold with the TB, no change. So I'm thinking it has to do with the transmission it self, I'm not going to bother getting it fix cause there is no point it works fine it's just annoying. And if the tranny ever goes I might just put in a 5spd cause that's what I want in the first place.

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