MShift and Toyota A34 Series Info?

[Bernard Fife]

mikeymkll7mgte,

You might need to check the output settings (and make sure they are wired the way you think they are), and you might need to play with the shift delay settings as well. You might want to look at gross polluter's settings from this thread: viewtopic.php?f=4&t=287&start=50 to see what he has done - it seems to be working for him.

Lance.

[mikeymkll7mgte]

I just compared his tune to mine side by side... He has some different settings as i think he is running pwm for pressure control, where mine is still cable. His shift inputs are different (Im guessing because im using a different shifter), but his outputs match mine exactly. I left my shift factors as they were, but ill try his tonight. Most of the VSS settings are the same.

I have tested the oututs on mine using switches to change gears, doing so in the garage with the car in the air and no tires, and it shifted fine through all the gears. I have triple checked wiring and such, and all seems good. I will datalog a run tonight, and try the manual switching of the gears while driving and see if its something to do with having a load on the trans.

[mikeymkll7mgte]

Well... it ended up being a problem in the trans. Tore in down and had the 3-4 shift valve installed backwards. now I can't get the vss to stop maxing out after the wheels start spinning. I have tried all different settings and it still does the same thing. Followed gross polluters settings also.

And also, when I shift slowly past or into neutral, the current gear and manual gear gauges go to -99. If I shift really fast past neutral, it seems to work fine. Any ideas?

Trans is an A340e. Mshift code is 2.200 just in case you need to know.

[Bernard Fife]

Code: Select all

I have tried all different settings and it still does the same thing

m,

That doesn't really tell us anything at all. You really need to post an MSQ and a datalog, and you need to go about trying different settings systematically, and report to us the results at each step. If you have disabled masking (input mask = 0), then you might need to enable it (set it to between 50 and 150 - I would try 85 to start). If you haven't tried to disable the masking, you should do that. The relevant parameters are here: http://www.msgpio.com/manuals/mshift/V22tune.html#gv

You will also want to make sure your VSS connections are perfect, your grounds are perfect (and all ground back to the same place on the transmission), and if none of that helps you might have to shield your VSS signal wires.

If the trans displays -99 for the manual gear lever position, it means the controller is not finding a valid gear based on your input patterns. So you might want to check the input patterns. On the other hand, the trans doesn't distinguish between Park and Neutral, and I will have to check to see exactly what it does if those input patterns are not the same (I can't recall exactly off the top of my head, this was written a long time ago, but I expect it shouldn't be a problem - I believe it is the same way on the 4L60e). However, as long as it recognizes the forward gears when shifted to them, the controller ought to work okay despite the -99 display.

Lance.

[mikeymkll7mgte]

I will get the MSQ and datalog posted when I get off work later today. My bad for the lack of information- here is what i have for right now-

As far as gounds go, I have all the MS3X and Mshift grounds that go out to a single spot on the block. From there, 2 main grounds (8awg) go out to the body. There is also one large ground (1/0awg) and another smaller ground (8awg) from the block to the body in two other different spots. There is also a ground from the tailshaft housing on the trans to the body. The battery is in the back of the car, with two large grounds (1/0awg) from it to the body in two different spots.

Regarding the settings- In the VSS setup, I know i have 4 teeth on the output shaft. With the same settings as gross polluter had, when i would shift into gear, the wheels would start turning, and the speedo would start reading 10-15 mph. As soon as I gave it some throttle and it started spinning faster, the speedo would peg out at 150mph. If i kept going faster, it would randomly bounch back down to 80 or 100, then peg back out. I tried changing from rising edge to falling edge- No difference. I tried the input masking at 0, 30, 70, 100, and 125- The speedo did the same thing each time. I then put the input masking back at 0, and tried changing the smoothing factor at 2, 4, 8, and 10- The speedo did the same thing on each setting. That was as much testing as i got to last night.

Inputs- I have 4 inputs from the trans. Each of them go high only in one gear. I only have an input in P, N, 2, and L. Im trying to figure out a way to wire the selector on the trans to have two or more of them go high in R and D. The stick only has PRND2L on it, so nothing can be selected for either 3rd or 4th. (but i do have an overdrive button i guess i could wire in.) When the controller shows -99, it will not control the trans. It acts like it locks up. I have to turn the key off then back on to get it to work. I believe that since gross polluter is using a MK4 trans that has all the outputs for the different patterns, his works fine. My trans is out of a 96 Supra non turbo, but with the selector and some of the other wiring from an older A340e because that is what i had in the car before this trans.

Anyways, thanks for the help Lance. I will get that other stuff posted up asap.

[Bernard Fife]

M,

One thing I would try is setting they mask to ~85, but then set the maximum speed to a much lower value, say 80 mph. That should allow for much more filtering, and let us see if noise is the issue and it we can sort in in software, or need to do some hardware troubleshooting.

Lance.

[mikeymkll7mgte]

I included the MSQ and a datalog. Car is in the shop on jackstands, I started it cold and let it warm up for 5 min before i did the test run. Stepped on and off the brake. Shifted quickly to D and let off the brake and then got on the gas some. You will see what it does.

Setting the speed lower didnt seem to help. It wont go any lower than 100mph. I also set the masking to 85 and it still does the same thing. Im going to crawl under the car in a min and swap the wires on the speed sensor and try that without changing any other settings. I will report back...

[mikeymkll7mgte]

Swapped wires and no change in the speedo behavior. Swapped speed sensors and no change. I know the OEM wiring is not shielded either. I have looked over my board very closely too and can find anything wrong (that i can see). At this point I'll try anything to get this thing working. I want to drive it so bad!!

[Bernard Fife]

m,

It's not really relevant that the factory doesn't shield the VSS wires - they know a lot about they potential noises in specific vehicle, and can filtering it out in hardware/software. With MShift, designed for universal use, things are different, of course.

Do you happen to have a trans stim? This would let your make sure they circuit is built right and fully functonal.

In any case, If this was mine, I might be tempted to add a 10K to 100K resistor inline with the VSS signal - it might quiet the noise. It that doesn't help enough, I would be tempted to try they same range of resistors in parallel with the VSS sensor.

Lance.

[mikeymkll7mgte]

I don't have a trans stim. Been thinking about getting one though. I do have a factory trans computer laying around that I could pull apart and see how the vr input is.

I will try the resistors in a bit and see how it works.