Toyota A340 control

'Microsquirt' Transmission Control development and support.

Moderators: jsmcortina, muythaibxr

jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

Did you try Don's suggestion of using 2k2 to ground on the A,B,C inputs?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

The actual gear and selector values (if this is what you are asking):
Park=0
Reverse=-1
Neutral=0
First=1
Second=2
Third=3
Overdrive(fourth)=4


And I have not tried the 2.2k mod. I'm not sure what that all means... A bit over my head. I'll speak with Jeff (Prof315).

Thanks!

I'm wondering if the difference here between Daniel's setup and mine is merely that he runs a GPIO and I'm using the MS2? Do the inputs work differently between the two?
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

Ok, finally tried one of the 2.2K resistors on one input while connected to the stim. Of course it worked. My apologies to Dan for not trying it earlier, I honestly didn't know what I was doing or what he meant exactly.

So, I'll test it in the truck soon. It's still down awaiting it's new converter.
devojet
Experienced MS/Extra'er
Posts: 309
Joined: Sat Dec 30, 2006 6:00 am
Location: Gold Coast, Australia

Re: Toyota A340 control

Post by devojet »

Yes there is a difference between GPIO and MS2. The difference is in the firmware. For the GPIO the internal pull ups of the micro controller are turned off for an a340, but if you select ms2 the pullups are turned on.

That is why my selector circuit doesnt work on the ms2.

Cheers
Daniel
26 Chev hotrod with a 1UZFE and MS3x, Flex fuel, GPIO Transmission control and LCDash.
Twin turbo LS3 powered Race boat with MS3pro and GPIO.
MS2 on a 22r in a Hilux (mates car).
MS2extra on a turbo EF Falcon (brothers car).
Toyota Supra 1jz MS2extra, COP.
13B Turbo MS2extra.
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

Hence the suggestion for 2k2 pulldown resistors.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

I see. Thanks guys. I'll post up when I finally get it resolved, or another problem presents itself.
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

Any updates?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

No, I'm sorry. I'm in the very rare instance (for me) that I am at the mercy of someone else's timeline. Having issues getting the torque converter issue resolved. Hopefully in the next week or so it will be finished. I will definitely respond once it is resolved. I want to make sure the resolution is clear for the next guys that want to try it. :D
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

Even without the convertor, it would be good to solve the selector position question if you are able to.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

Agreed, but the truck is up on a lift at a friends shop about 15 miles from here. With only one vehicle between my wife and I now, it's difficult.
That and I want to get it here before I start modding the setup. I know it drives now, if I screw it up, I'd rather do it here where all my electronics gear is.
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

OK, no worries.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

Just wondered if you'd had chance to try this. I'm about to put out a new trans control beta release and it would be good to include updated information in the manual if possible.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

Shoot. No. Let me try to get to it tonight. Been working crazy hours this last week since I got the truck back up and running.
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

Ok, I've successfully added the 2.2K resistors to my little project board that has all of the logic circuitry built on it. Somehow SP4 lost it's ability to output 5 volts as measured to ground. It's been hardwired to ground to keep it in OverDrive for the last few months while we've been working on the other issues. I wonder if I had too much current draw through it?
That being said, all combinations of the selector that require SP4 to be low work correctly. So, Park (0), Neutral (0), Second (2), Third (3), and OverDrive (4) all show correctly. Reverse and First are not indicating correctly because SP4 couldn't "go high". I tried cycling power a few time to no avail.
jsmcortina
Site Admin
Posts: 39585
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Toyota A340 control

Post by jsmcortina »

Your circuit should be supplying 5V to the selector inputs. The 2K2 pulldown was to prevent any internal processor pullups from interfering.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

Yes, that is correct. But the circuit is supplying the proper voltage, but SPARE 4 appears to be in a locked state. It won't change value. When I unsolder it and check for voltage on that input, (it should be high until it is grounded through the 2.2k) it reads zero volts whereas the other two read 5v.
The voltages on the logic board are all correct.

This happened to all of the inputs before. When I tested the code modification recently. Something in the MS2 didn't like the change and would shut down (protect mode?) all three of the inputs. It would be in a continuous Shift Fault until I cycled power for a minute or two and reverted to the unedited code. But, with no code modification now, I'm not sure what I've done. Is it possible to somehow destroy one of the inputs and "burn" it into a fixed state? There aren't any shift faults now, Reverse and First just indicate the same as Park or Neutral. That tells me that the input isn't reading the going high state on SPR4. The voltage is correct on the logic board.

I'll investigate some more today. It was late last evening.
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

I put it back on the stim last night to test SPR4. After flashing the 1.0.2 beta2 firmware, the state of SPR4 is still locked in the going low state. I even pulled the board from the case again to probe the circuit all the way to the pin on the motherboard. It all appears to be good up to the chip. Going to head over to Jeff's (Prof315) to try installing a different daughterboard this afternoon.
litneon
Helpful MS/Extra'er
Posts: 67
Joined: Mon Apr 29, 2013 5:19 pm

Re: Toyota A340 control

Post by litneon »

Just an update.
The logic board is working great. Thank you so much for all of your help over the last bit.

I added a circuit on the board for my brake signal input consisting of a current limiting resistor, a 5v Zener, and a pull down resistor. With the 12v brake signal input to the board, I have the controller set to a going high signal and it works flawlessly.
I did somehow damage the "A" input pin. I'm not sure how that could have happened, but it's not responding. With it failing in the the "going low" state the shift indicator continues to function without registering Park, Neutral, or Reverse. Everything else works well. I'm trying to determine if there is a reason to replace the board. As long as it doesn't change, I can't see why I should. But I could see getting stuck somewhere if the IC switches to the "going high" position and stays there. Then I would have a selector fault in every position except Park, Neutral, or Reverse.

Are the IC replaceable without buying a new daughterboard? Or does it just make more sense to order the board?
dontz125
Super MS/Extra'er
Posts: 4200
Joined: Mon May 11, 2009 7:14 pm
Location: York, ON
Contact:

Re: Toyota A340 control

Post by dontz125 »

The IC can be replaced by someone with the correct skills and tools. The new (blank) chip has to be programmed with the monitor code using a BDM. There are folks who do this for a reasonable fee.
QuadraMAP Sensor Module -- PWM-to-Stepper Controller -- Dual Coil Driver
Coming soon: OctoMAP Sensor Module
TTR Ignition Systems
Turbofreakdotcom
Experienced MS/Extra'er
Posts: 201
Joined: Mon Sep 15, 2008 9:29 pm

Re: Toyota A340 control

Post by Turbofreakdotcom »

In preparation of purchasing the Microsquirt for CAN comunication to my MS2/Extra to control the A30e cable driven line pressure trans in my 87 Supra, I have gone through this thread the last couple days re-reading. There are a few things I'd like to ask.

What shift solenoids were used on the A340 to convert to the low side switching? My solenoids ground at the solenoid body bolted to valve body with (1) terminal hot wire.

Will the diagram in the Microsquirt trans control manual for a340 gear selection be correct for the Microsquirt or have there been changes? I was a bit confused here with the elimination of the diodes.

Can a complete V3 Megasquirt 2 unit be used (since I have one laying around)?

Thanks for any advice
Updated 6/20/18:
87 Supra-3.0 1.5JZ-A340 trans
MS2 ECU
MS2 Trans controller
Post Reply