2003 Miata Transmission Conroller

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AndreyB
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2003 Miata Transmission Conroller

Post by AndreyB »

Pretty simple automatic transmission - two shift solenoids and torque converter clutch solenoid, "line pressure is by mechanical cable" whatever it means.

Diagram http://rusefi.com/wiki/index.php?title=Vehicle:Mazda_Miata_2001#Automatic_Transmission

I've got couple of units as connector donors and just got a pigtail today. First step would be making a harness extension so that I can analyze stock TCU behavior.

Looks like a 35 position connector? Will try getting part number from TE support people on Monday.
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AndreyB
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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

High-side solenoid control and VR speed sensors? Will measure solenoid resistance soon.

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AndreyB
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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

I've destroyed the connector pictured above while trying to solder wires to it :( Looks like a PCB is pretty much required, next step is measuring the pinout. TE Live Product Chat were not able to identify this part.
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matt
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Re: 2003 Miata Transmission Conroller

Post by matt »

did you mean controlling auto trans via rusefi?

Abricos
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Re: 2003 Miata Transmission Conroller

Post by Abricos »

mattsabun wrote:did you mean controlling auto trans via rusefi?
Yes

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Re: 2003 Miata Transmission Conroller

Post by matt »

great!!
i got kia carens with auto transmission very similar with lantis gearbox.
faulty maybe from ecu or wiring harness, I am not check it yet.

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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

Finally I've decided to open my eyes and realize that it's a JAE connector. Wire side is MX7-A-35SC http://jae-connector.com/en/pdf/SJ028726.pdf

For board side we can use left part of attached larger header, I was not able to find a 35 header so far.
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AndreyB
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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

Actually page 4 of attached has the 35 header.
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Re: 2003 Miata Transmission Conroller

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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

Solenoids diagram added to http://rusefi.com/wiki/index.php?title=Vehicle:Mazda_Miata_2001#Gear_diagram

All three solenoids are 18 Ohm each. Looking at the diagram these seem to be high-side controlled? Could it be simple on/off? Should I solder a couple of toggle switches and try to drive it like that?!

[video]https://www.youtube.com/watch?v=rYto781SRiw[/video]
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Re: 2003 Miata Transmission Conroller

Post by stefanst »

russian wrote:[...]All three solenoids are 18 Ohm each. Looking at the diagram these seem to be high-side controlled? Could it be simple on/off? Should I solder a couple of toggle switches and try to drive it like that?![...]
AFAIK the solenoids A/B are definitely just on/off. So is -presumably- TCC.

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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

There could be a lot of overlap with this unit
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Re: 2003 Miata Transmission Conroller

Post by porelmundo »

Several years ago i was working with AW4/A340 transmissions for drag racing applications meaning that are only for manual paddle operation,
is basically a driver board with a 7 segment display for gear indication and a simple Arduino logic arrangement. Today im converting a Lexus with a 1JZ GTE VVTI to rusefi and im planing to use this board for shifting the transmission and controlling the trans pressure solenoid from a PWM output from the rusefi. If you are interested i can send you one so you dont have to use that crazy switch board. :lol:

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AndreyB
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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

YES! Just emailed you my address.
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Re: 2003 Miata Transmission Conroller

Post by porelmundo »

It's rudimentary but works,
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Re: 2003 Miata Transmission Conroller

Post by AndreyB »

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DeckGT
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Re: 2003 Miata Transmission Conroller

Post by DeckGT »

Interesting project! My buddy got this 2003 Miata project we'll work on right after we finished installing the suspension from 4Wheelonline onto the trucks and clear the garage. I'll let him check he likes the transmission controller idea of yours.

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