SC400 Auto kickdown

[Peewee]

I think this is an ECU question.

Looking at the diagrams for the SC400, it has a kickdown input.

Now, is this part of the auto box? or is it a switch on the base of the accelerator pedal?

Ta

 

[madmont]

Mine had a big black switch under the accelerator pedal , now I have a microswitch mounted on the throttle body.

 

[Peewee]

Ahh cool, that answers that question.

I'm using a UZS131 Crown autobox with the cable on it, so maybe that has a switch inside the box that activates under full throttle.
Otherwise a microswitch will be the go.

Cheers for that, mucho appreciato.

 

[sideshow]

hey pee wee if u r using crown auto box with sc400 engine and ecu u might run into speed sensor issues

i never hook up the kickdown switch
the tps position and speed saignal into gbox is what affects the kickdown

the crown box has digital signal
and the sc400 has an analog signal for the speed into the ecu

 

[Peewee]

From the ecu diagrams, all I need to do is use the SP1 input, which is from the front of the gearbox, and the SP2 input which will be 4 pulse per rev from the back of the speedo.
That should be it.

 

[sideshow]

that might work

i know with the sc400 they have sp+ and sp- on back of gbox as main sensor
and the sp1 is the backup

 

[Peewee]

I only have the US Spec diagrams, so I'm going off them.
But if you have the Aus Spec ones, that would be great.

But there seems to be 3 speed inputs.
SPD or SP1 = Combination meter, not sure what that one is.
SP2+ and - = 4 pulse per rev, i'm getting that from back of speedo
NCO+ and - = O/D direct clutch speed sensor (or T/M input speed sensor) which I am assuming is the one on the front of the gearbox (just behind where the bellhousing bolts on)

I am yet to check the pinouts as I only started thinking about this yesterday, so I could be wrong somewhere there.

I'll be looking at them over the next few nights, see what goes where.

 

[sideshow]

sp2+ is 4 pulses per rev of output shaft
spd or sp1 is 4 pulses per rev of speedo cable

it takes bout 2.5 or 3 revs of outpuyt shaft to get one rev of speedo cable

nc0+ is what u said

i have alot of info but sorry i have stopped handing stuff out cause it ends up on the net

sp2+ is analog input but a digital input might work

but i have devices that u can adjust pulses goin to ecu to control when to change gears

 

[Peewee]

Cool.
I'll play around with it all, see what I can do.
If I can't, I'll order something from you.

They are about $130 aren't they?

 

[sideshow]

nup
they are 200 for digital or analog input to digital output
if u need digital or analog input to analog output they are closer to 300 dollars

 

[Peewee]

Cheers.

I'll see what I can work out.

I can see myself taking to the 20tooth disc at the back of the autobox with a dremel and making it 4tooth.

 

[sideshow]

yer then u have to fit the 2 wire sensor

 

[hi-lex]

hey peewee, Im thinking of swapping my crown ecu and etc from my lux for the majesta all in one ecu. is this kinda what u are doing? what Im asking is the majesta/sc400 ecu compatible with crown box electrically, they look the same except for tailshaft yoke, thinking of doing this as I can use crown ecu in another conversion im doin with 5spd so I can keep the other crown cut complete, damn 1uz,s everywhere at the moment!!

 

[Peewee]

Its sort of what I'm doing.
You might just have issues with the transmission plugs, probably the speed sensors like I am.

I can't see anything on the motor being an issue. Maybe the o2 sensors, but nothing you can't get around.
You may also have to swap the little bit of the loom that runs behind the LHS cam pulley, I'm not sure.

 

[Peewee]

Just a quick follow up on this.

I took the 32tooth chopper wheel off, and cut it down so there was only 4 teeth left (12, 3, 6, 9o'clock)

Tested 3 wire crown sensor vs the 2 wire soarer sensor.
Soarer sensor produced about 0.6VAC when quickly testing with screw driver.
Finding the correct 2 wires on the Crown sensor produced about 0.1VAC with the same test.

So I thought I'd wire it up and see how it goes. Worst case scenario it chucks code 61 as SP2 not sensed (SP1 was hooked up)

Anyway, I have driven the car about 15km now and no error from SP2, so it looks like it has worked.
Will keep an eye on it.

I've had another issue whith running a UZS131 tranny on the UZZ31 ecu, but thats another story.

 

[Peewee]

Aaaahhahaha, I spoke too soon.

Took it for a drive tonight, 200m down the road, O/D starts flashing.
Came home, sure enough, code 61.
Back to the drawing board.

On another note its not kicking down very well.

 

[sideshow]

another prob is the crown has 3 wire hall effect sensor 32 pulse

the others have a 2 wire inductive pickup 4 pulses

i have a converter to do this but they are not cheap

 

[Peewee]

Yeah, thats all sorted out.
From what I could figure out the Crown sensor has an inductive sensor in it, as well as a hall effect.
But the voltage output is too low (0.1v compared to 0.6v from the Soarer)

So I'll just make up an adaptor plate to bolt the Soarer one to the Crown box.

 

[sideshow]

yer thats the easiest

i have a loom here thats a sc400 soarer loom with a ls400 ecu and a crown gbox

i started making it for a customer but he sold the car so i kept the loom and ecu

would have been a nightmare to diagnose any faults as there was over 100 solder joints

maybe never would have had a prob if done properly but i hate resoldering complete loom plugs much better to just go buy a 2nd hand loom less headaches in the future

 

[Peewee]

That sounds like more of a bitsa than mine.

Most of my Electronics/Sensors are Soarer, few are Crown, couple are Celsior
Most of the Mechanical parts are Crown, with a few Soarer and Celsior.

Its coming together, but I wouldn't recommend it to anyone to do it this way.