The 2 ecus are different by part number.

Type SH - P5P
Base - P5M

However the SH comes with a seperate computer for ATTS, so what is the real difference between the two computers. Can they be interchanged ?

 

Well, a Base ecu obviously won't work in an SH. However, I don't see any reason why an SH ecu wouldn't work in a Base. You'll just have an extra slot that you won't use.

 

I was told you can't use an SH Ecu due to the Atts programing (two chips working together) but I could be misinformed.

 

I've run my p5p ecu without the atts control unit attached without any problems.

 

Come think of it i think it was that the 97 sh ecu wont work with a newer sh 98-01.

 

i always thought it would work just cant use the ATTS computer. That was just what i assumed though. Good question...does anyone know for sure ?

 

did you ever find out if this will work? thanks

 

I can't answer for sure, but there shouldn't be any reason you can't use a base ecu in an SH if you don't care about the ATTS. You will have to make sure the years match if it's a '97 or '98 I think; '99-'01 should be interchangeable. Reason being is that emissions things changed in those first years so the wiring and components are slightly different.