OBD II EJ swap HELP/ Speed Sensor

[Gloyale]

OBD II Outback 2.2 liter installed into 89 GL w/ Single Range 5spd.

 

I've got most of the wiring sorted out.

 

BUt I ran into a potential problem. The VSS.

 

On OBD I, the ECUs used a reed switch based VSS mounted in the speedo head.

 

But for OBD II, the VSS is mounted in the trans where the cable would go.

 

 

So, If I mount the Outback VSS into the trans and hook it up, the ECU will be happy........but I'll have no Speedometer.

 

But if I don't hook up a VSS, the Engine will be REV limited to just over 4k. (I know because the donor car had a VSS fail and had said rev limiting occur. Replaced and ran fine till it was wrecked:rolleyes:)

 

 

What have others done?

 

Maybe I'll look into what it would take to install the Outback Speedometer head into the dash.

[capn_r]

Here is a link for a product that should work for you

 

http://www.enginewiring.com/catalog.htm and a thread that may shed some light.

 

http://www.ultimatesubaru.org/forum/showthread.php?p=852061

 

[Numbchux]

VSS wire from the ECU. to the reed switch in the gauge cluster. Done.

[Gloyale]

VSS wire from the ECU. to the reed switch in the gauge cluster. Done.

 

I knew it was that easy with the OBD I.

 

I thought however that the VSS in the OBD II cars with electric speedo produced waveform, and the simple on off of a reed switch won't work?

 

If you think it's fine, then I'm not gonna worry much then. I'll hook it up on monday.

 

thanks

[kingbobdole]

All the PCM is looking for is a square wave. Frequency determines speed no matter if it's obd1 or 2. I just hooked up my 86 dash vss to an 03 legacy PCM and then using a scan tool watched the PCMs readout. It read just like the dash with no issues.

[Gloyale]

All the PCM is looking for is a square wave. Frequency determines speed no matter if it's obd1 or 2. I just hooked up my 86 dash vss to an 03 legacy PCM and then using a scan tool watched the PCMs readout. It read just like the dash with no issues.

 

This is EXACTLY what I wanted to here. After reading you're VSS thread, I figured as much, glad for the direct comment here.

 

Thanks again King, and all the USMB.

 

I will post a new thread when the car is done, and add a photo in the who's who sticky.

[Gloyale]

Here is a link for a product that should work for you

 

http://www.enginewiring.com/catalog.htm

 

Looks like I won't need this for the 89.

 

But It may solve the issue I had of a complete lack of any type of VSS in the '81 wagon when I did that EJ swap.

[LeoneTurbo]

Nice. So now I don't need to find a EA81 dash with speed sensor for my project