Transmission difference problem?

[b3lha]

Does your Subaru agent have a wiring diagram for the impreza or whatever car the gearbox came from? Surely somebody on this forum must have access to one.

I don't have a diagram unfortunately, but I did some searching on impreza forums and it looks like the signal wire is green (possibly with a black stripe).

If the wires are in the same order as ours then the middle one (brown) will be the earth, that leaves white to be the power.

Phil.

[Dessertrunner]

Phil, I have a half cut SVX from Japan so I will pulll the speedo sensor from it today and we can give it a go. What will the colours be on the SVX sensor? Do you know if the output is AC or DC?
Tony

[oab_au]

Originally Posted by Dessertrunner

Phil, I have a half cut SVX from Japan so I will pulll the speedo sensor from it today and we can give it a go. What will the colours be on the SVX sensor? Do you know if the output is AC or DC?
Tony

Hi Tony the output is DC, a square wave, changes from 0 V, to 5 Volts. Four times per rev. Sorry I don't have the wire colours for that sensor.

Harvey.

[b3lha]

Originally Posted by Dessertrunner

Phil, I have a half cut SVX from Japan so I will pulll the speedo sensor from it today and we can give it a go. What will the colours be on the SVX sensor? Do you know if the output is AC or DC?
Tony

As per the diagram posted earlier in this thread:

Pin 1 (Yellow/Red) - Signal
Pin 2 (Black/White) - Ground
Pin 3 (Red/White) - Power

When you turn the shaft, the signal voltage should go 0 5 0 5 0 5 0 5 0 5 etc.

[Dessertrunner]

Okay we have made progress (I think) finally we have a repsone from the sensor but it is not as we thought. The wires are as you suggested guy just that the mode of action is different then we thought. To explain the signal wire completes shows a response by enabling you connection to go to ground. I connected the ground wire of the scope to the ground wire of the power supply and the probe to the singal wire nothering happened got no signal. In frustration be get lock in the aslyume I tried the probe connected to the Power and the earth of the probe connected to the signal wire. This worked and then I checked it with the multi meter and it worked the same. Interesting thing is that it means that the unit is not voltage senstive it just complets the circut for what ever power you supply it. Also if you disconnet either the power or ground of the other two wires it won't work. So Gentlemen have we discovered some and are we making progess I will now trying wiring into the computer as you have both suggested. THis might explain why Phil got 5v and I got 9v on the white wire it doesn't matter as it is just getting a ground source.
Tony

[oab_au]

Hi Tony, Is the signal a square, or a sine wave?

Harvey.

[Dessertrunner]

Harvey, high there hope it isn't as cold were you are that it is here, I didn't put it on any form of drive I just rotated by hand which didn't give a clean signal so I can't answer the question. The GOOD NEWS IS THE SPEEDO NOW "WORKS" and it reads right against the GPS. I still need to sort out the cruise control as it doesn't work yet so I offer you and Phil the next challange. Appricate the help getting this thing sorted out one day I plan to drag it up your way and thank you in person.
Tony

[b3lha]

..........

[b3lha]

Originally Posted by Dessertrunner

Okay we have made progress (I think) finally we have a repsone from the sensor but it is not as we thought. The wires are as you suggested guy just that the mode of action is different then we thought. To explain the signal wire completes shows a response by enabling you connection to go to ground.

That's great news!

Your description of how it works makes far more sense than what the service manual describes. The controller floats the line and the sensor pulls it down to earth, 4 times per revolution.

Are you using the impreza sensor or the JDM SVX one?

I still need to sort out the cruise control as it doesn't work yet so I offer you and Phil the next challange.

Happy to help if you can describe the problem better.

Phil

[Dessertrunner]

The impreza sensor I couldn't get the other one.
Tony

[b3lha]

Harvey,

In my (USA) service manual, Chapter 3.2 (Automatic Transmission and Differential), Section T4 (Transmission Control Unit I/O Signal). There is a table showing what each pin on the ECU is for.

If your Aussie manual has a similar table, could you tell me what it says about pins 11 and 17 of B66 and pin 6 of B68. I'm starting to get an idea now about how the TCU works. Looks like connectors B66 and B67 are all inputs and B68 is the outputs.

Phil.

[oab_au]

Originally Posted by b3lha

Harvey,

In my (USA) service manual, Chapter 3.2 (Automatic Transmission and Differential), Section T4 (Transmission Control Unit I/O Signal). There is a table showing what each pin on the TCU is for.

If your Aussie manual has a similar table, could you tell me what it says about pins 11 and 17 of B66 and pin 6 of B68. I'm starting to get an idea now about how the TCU works. Looks like connectors B66 and B67 are all inputs and B68 is the outputs.

Phil.

Phil, it is a bit different, the pin 11/B66 is not used.
Pin 17/B66 is the input for the No. 2 speed sensor.
Pin 6/B68 is the out put for the speedo.

The B68 plug has all the gearbox operations on it, eg solenoids, torque control, dropping res, etc.
B67 has all the inputs from the gearbox, eg, temp sensor, inhibitor sw (except P,R,N). No.1 speed sen.
B66 has inputs from P,R,N, Speed sensor No.2, all the other inputs, Manual, ABS, brake, cruise control.

Harvey.

[Dessertrunner]

Harvey, Phil we have success pin 11 & 12 which are the Nutrel & Park on the Auto function in two ways, when the circut the is closed eg in N or P the engine can start but it also pulls a relay that opens the circut for the cruise control. This relay behaves as if the clutch or brake was touched, in is in the same circut. The soluation to the problem is to connect the 11 & 12 to the netrul postion switch on the gear box and away it goes problem sloved. I have now sorted out all the problems and just need to get some plugs to tiddy up the job a bit better. Thanks guys for all your help.
Tony

[b3lha]

Originally Posted by oab_au

Phil, it is a bit different, the pin 11/B66 is not used.
Pin 17/B66 is the input for the No. 2 speed sensor.
Pin 6/B68 is the out put for the speedo.

Thanks Harvey, you're a star. Your wiring diagram shows 11/B66 taking input from 6/B68. This is the same pin where the JDM TCU takes it's VSS2 input. I have a strong feeling that the JDM and Aussie TCUs are the same part, but wired differently. Out of pure curiousity, I'm going to have a look at the wiring on my JDM cars. I'm wondering whether it's possible to trigger the Econ mode (which is not present on JDM cars) by grounding 4/B66 as per your Aussie wiring diagram. I'll also look at how the JDM power mode button is wired and see whether it's possible to add a Power mode button to Aussie SVXes without frigging the TPS signal.

Originally Posted by Dessertrunner

Harvey, Phil we have success pin 11 & 12 which are the Nutrel & Park on the Auto function in two ways, when the circut the is closed eg in N or P the engine can start but it also pulls a relay that opens the circut for the cruise control. This relay behaves as if the clutch or brake was touched, in is in the same circut. The soluation to the problem is to connect the 11 & 12 to the netrul postion switch on the gear box and away it goes problem sloved. I have now sorted out all the problems and just need to get some plugs to tiddy up the job a bit better. Thanks guys for all your help.
Tony

Nice one Tony. This has turned out to be an interesting thread.

[oab_au]

Originally Posted by Dessertrunner

Harvey, Phil we have success pin 11 & 12 which are the Nutrel & Park on the Auto function in two ways, when the circut the is closed eg in N or P the engine can start but it also pulls a relay that opens the circut for the cruise control. This relay behaves as if the clutch or brake was touched, in is in the same circut. The soluation to the problem is to connect the 11 & 12 to the netrul postion switch on the gear box and away it goes problem sloved. I have now sorted out all the problems and just need to get some plugs to tiddy up the job a bit better. Thanks guys for all your help.
Tony

Good results Tony. The cruise control uses the inhibitor switch to turn the cruise control off, when you shift into P or N, by grounding that relay through the starter solenoid. A strange set up, it makes it hard to fit a relay to the starter solenoid also.

Is the cruise working OK now ?

Harvey.