Subaru 3 Wire Speed Sensors and Haltech

Hey brains trust, i decided to completely rewire my entire car, a 2001 AU delivered Subaru Impreza WRX (GD) with a 5 speed manual.

I'm also running a Haltech Elite 2500, by some miracle everything works except the speed sensor.

Its a Subaru 3 wire, so hall effect. According to the wiring from Subaru it should have a 12V, ground and output.

However i can't reliably find which pin in the sensor does what, its not in any of the GD manuals accurately.

I've now replaced the sensor, which while the sensor is the same, its harness was completely different colours.

So i now have 2 sensors, neither of which work, one with brown, white and green. The other green black, yellow black and brown.

Can anybody confirm which pins is 12V, ground and output?

And is there a way to bench test this without an oscilloscope? What is the expect output of the sensor? Some say it oscillated between 12V and 0V. others say its between mv range and 1.5V and others say its between 0V and 5V.

Last question is Haltech specific, while SPI inputs support 12V, for speed sensor, while using an SPI input it appears to only accept up to 5V. Can anybody confirm if this is the case? And if so, did your sensor actually support the 5V input

I've attached the only diagram i could find related to the sensor

And also the actual sensor i have

Do you have the pull-up enabled? Even though they call the sensor a MRE type, in reality they seem to function just like a typical open collector hall effect, switching between 0V and whatever you have as a pull-up.

No don't have a pull up enabled, although i have tried that

Paul,

The image you posted shows which pin is which on the sensor. (vssdiagram.jpg)

"power" needs to be 12V switched, ground is constant ground, output is the signal to the ECU.

I'm sorry I'm no help with the Haltech specific bits.