R154 speed sensor

[1uzvl]

Sorry,i didnt ask vdo about pulse per etc just what sensor i should be using.I did ask on other forums if i could use toyotas sensor but no real headway on that question.

Can the speedo infinatly count revs to a certain speed?In extreme case say it had one pulse per rev,could it just keep counting revs to say make 100km/h?

 

[Cobber]

The speedo is completly adjustable with a learn 1 km feature. You can use any hall effect sensor.

 

[cjsupra90]

Yeah, its adjustable in pulses per km or like here in the states, its pulse per mile. They usually have a maximum pulses per mile that they will work with. Beyond that pulse count, the pulse frenquency is to fast for the unit to be able to accurately count the pulses...

 

[1uzvl]

Why didnt i ask the question here first,would of had it sort months ago.

 

[Cobber]

Ahhh Lextreme the answers to many of life's little mysteries.

Anyone know why my wife keeps on buying shoes?

 

[1uzvl]

Good question Cobber,i really want to know were my lap goes when i stand up?

 

[Peewee]

1uzvl, you have a Crown UZS131 Sensor there.
Its actually a 20pulse/rev, not a 4pulse/rev.

If you need to adjust it you can get a jaycar speedo corrector, and with that you can double or halve the pulse count (and anything inbetween). Its a bit laggy on high rate of changes (such as taking off from a standstill), but apart from that its fine.

 

[1uzvl]

How did i end up with that?My original engine was a crown but i never had a auto for it.Ive only got a celsior auto and supra mk III(i was told)r154 cog swapper.Might have to check a few things i think.

 

[Peewee]

Not sure, but it look identical to the two I have at home, which are both ex UZS131, although the cable is not that long, its only maybe 6" long.

I'll take a photo.

Maybe its just the same body but has different internals ?
It could well be an MA70 Supra R154 sender. (its def not Celsior).

Mine also has Pink(red), White and Green wires.

 

[1uzvl]

Yeah im sure it came off my supra box.Does the MA 70 have a cable drive speedo?The crowns seam to be a bit agricultural in they way they are designed so i wouldnt be suprised if thats what it came from.

 

[cjsupra90]

Yeah im sure it came off my supra box.Does the MA 70 have a cable drive speedo?The crowns seam to be a bit agricultural in they way they are designed so i wouldnt be suprised if thats what it came from.

Yes, the MA70 is a cable drive Speedo (at least here in the states it is)... The sensor that is on it is a speed sensor for the ABS... It is a little different then a normal VSS... It requiers a pull-up resistor to be used which is built into the ABS ECU. It can be used as a VSS unit though..... Its a ferrous target sensor or gear tooth sensor. There is a trigger wheel on the main shaft that it reads from.

 

[Peewee]

Didn't the late MA70's have electronic driven speedo?
I have a 1990 which has a cable, but I was under the impression that the 91/92 models have electronic senders, much like the Cressida did.

 

[cjsupra90]

Not here in the states they didn't.... Probably the Digital dash cars had a electronic sender but we didn't get digital dash cars here.... I dont even think that the cressida's here ever got electronic senders but I could be wrong there.

Side note: Toyota did a lot of strange things for different regions like the fact that all years Euro and <90 canadian (and maybe elsewhere) A70's had an electronic hatch release.... Why not fo that everywhere, why only select areas?????

 

[Peewee]

We have cable hatch release.
I think most of our MA70's are digi dash as well, but 1986-1990 is definitely still cable driven. I think only the special versions (Turbo A, JZA70R etc) got analogue dashes.

Toyota do some strange shiznit.

 

[Cobber]

Just to confirm the wiring was correct as per previous post

White = Signal
Yellow =12v
Red / blue = Ground

About 4 pulses per rpm of the tail shaft.