CountOfNowhere
Active member
- Joined
- Mar 24, 2004
I have a 1991 940 16v that I am pretty sure has a dead ECU. According to the documentation I can find, it's a 5xx ECU.
Hoping someone can confirm a couple things I've pieced together:
1. 5xx and 9xx ECUs are wired the same and can be swapped
2. Chips do not swap between 5xx and 9xx ECUs
I read a comment that indicated 16v and NA 8v software was similar enough that I could run an 8v NA ECU on my 16v. Based on reliability reports, I'm thinking that is potentially a better call than finding a 5xx ECU and swapping my 16v chip in.
Does anyone have any thoughts or experiences? I haven't removed the ECU yet, and the ECU charts don't have the 940 16v listed (I'm just assuming it's the same as a 1991 740 16v).
Hoping someone can confirm a couple things I've pieced together:
1. 5xx and 9xx ECUs are wired the same and can be swapped
2. Chips do not swap between 5xx and 9xx ECUs
I read a comment that indicated 16v and NA 8v software was similar enough that I could run an 8v NA ECU on my 16v. Based on reliability reports, I'm thinking that is potentially a better call than finding a 5xx ECU and swapping my 16v chip in.
Does anyone have any thoughts or experiences? I haven't removed the ECU yet, and the ECU charts don't have the 940 16v listed (I'm just assuming it's the same as a 1991 740 16v).