manual conversion wiring for speedo

[93tzlegacy]

hey guys, im having issues with my speedo wiring, it seems that the sensor scaling may be incorrect, i dont get a speed reading till im in second gear, then im doing 260 (on the speedo) by the time im at the top of 4th gear.....
ill pay if anyone can sucessfully make my speedo work.
currently have a 2 wire speed sensor installed, would a 3 wire one make a difference?
thanks, Ben.

[Hocrest]

Yeah, take the 3 wire speed sensor out of your SVX trans and swap it into the 5 speed.

[93tzlegacy]

Originally Posted by Hocrest

Yeah, take the 3 wire speed sensor out of your SVX trans and swap it into the 5 speed.

aus delivered cars dont have a speed sensor in the front diff . they use the park pawl ring as a tone ring for road speed indication, then the tcu emulates what the speed signal should be.

tomorrow as a last ditch attempt i will try and wire in the 3 wire sensor and see how that goes.
thanks, Ben.

[Hocrest]

Ah, sorry about that. I didn't notice your location...
Not sure then, I seem to remember other posts about this though.

[michael]

This may be the thread you were thinking of Dave.

http://www.subaru-svx.net/forum/show...t=speed+sensor

[93tzlegacy]

can anyone confirm that the sensor signal is different between the 2 and 3 wire sensors?
also is the reference voltage supposed to be 12v or 5v?
thanks, Ben.

[oab_au]

Originally Posted by 93tzlegacy

can anyone confirm that the sensor signal is different between the 2 and 3 wire sensors?
also is the reference voltage supposed to be 12v or 5v?
thanks, Ben.

Hi Ben, yes the signal is different. The two wire is an inductive signal at a higher number of sine wave pulses per rev. The three wire is a Hall Effect with 4 square wave pulses per wheel rev.
You need to get a sensor from a US or JDM box and feed the white signal wire straight to the speedo, bypassing the TCU. You need 12 V to the sensor to run it.

Harvey.

[93tzlegacy]

Originally Posted by oab_au

Hi Ben, yes the signal is different. The two wire is an inductive signal at a higher number of sine wave pulses per rev. The three wire is a Hall Effect with 4 square wave pulses per wheel rev.
You need to get a sensor from a US or JDM box and feed the white signal wire straight to the speedo, bypassing the TCU. You need 12 V to the sensor to run it.

Harvey.

SWEEEEEETTTTTTT. just making a 2 wire to 3 wire adaptor harness so i dont have to cut the loom i soldered together last night.
thanks, Ben.

[oab_au]

Ben this is the wiring for the Ozzie box. You can see the wire from the No.2 sensor where it goes to the A17 pin on the TCU plug. You need to cut that wire and connect it to the yellow/red wire above it, that goes to the speedo.

http://www.subaru-svx.net/photos/files/oab_au/13771.jpg

Harvey.

[93tzlegacy]

Originally Posted by oab_au

Ben this is the wiring for the Ozzie box. You can see the wire from the No.2 sensor where it goes to the A17 pin on the TCU plug. You need to cut that wire and connect it to the yellow/red wire above it, that goes to the speedo.

http://www.subaru-svx.net/photos/files/oab_au/13771.jpg

Harvey.

thanks mate , i got it working finally no more hair pulling do i need to wire the cruise control speed signal up also or is it patched into the red / yellow wire?
thanks, Ben.

[oab_au]

Originally Posted by 93tzlegacy

thanks mate , i got it working finally no more hair pulling do i need to wire the cruise control speed signal up also or is it patched into the red / yellow wire? thanks, Ben.

I got no idea on that, but I'll have a look see what it involves.

Harvey.

[93tzlegacy]

Originally Posted by oab_au

I got no idea on that, but I'll have a look see what it involves.

Harvey.

thanks mate , appreciate the effort

[Dessertrunner]

Hi Ben,
Sounds like you have the speedo sorted. You need to make sure that the ECU is still getting a signal. I am sure Havery has pointed you in the right direction. Is it reading at the correct speed?
The cruiser won't lock in because it sees the starter on the end of the circut it does this throught the diode near the glove box. What I did was unbolt the side of the dash on the passenger side and locate the "Two Diodes" you need to pull only 1 of these, Harvey might be able to tell you which one as I am pretty flat out at the moment. That is pretty well all you have to do to get the cruiser to run.

By the way don't wire the starter throught the netural switch as it can't stand the load. Also in Australia it is not a legal requirment.
Have a great day.
Tony

[93tzlegacy]

Originally Posted by Dessertrunner

Hi Ben,
Sounds like you have the speedo sorted. You need to make sure that the ECU is still getting a signal. I am sure Havery has pointed you in the right direction. Is it reading at the correct speed?
The cruiser won't lock in because it sees the starter on the end of the circut it does this throught the diode near the glove box. What I did was unbolt the side of the dash on the passenger side and locate the "Two Diodes" you need to pull only 1 of these, Harvey might be able to tell you which one as I am pretty flat out at the moment. That is pretty well all you have to do to get the cruiser to run.

By the way don't wire the starter throught the netural switch as it can't stand the load. Also in Australia it is not a legal requirment.
Have a great day.
Tony

thanks tony, for the starter i just bridged the 2 wires together, started fine. the cruise info would be great, harvey can you help.

[Dessertrunner]

Ben,
Run this teat for me.
Okay so if your speedo is wired right you should be able to start the car, then unplug the small wire off the starter and then you can go for a drive and test the cruiser (need to be above 40kph). It should work. Once we find that works we can sort the next step out.
Tony