ID my ECU please

ShaneHobson · #1 12-21-2013, 10:38 AM

Pulled the ECU from my parts car to swap into Daniel's car to troubleshoot his problems and noticed that the RAM was socketed and had a handwritten sticker on it. This is different from Daniel's so we're wondering what the difference might be.
My parts car is 1992 JDM. I think Daniel's is the same.
A couple of photos are attached.

Inscription on the sticker is
F23AYD06

I've

d the number, but no hits.

dragoontwo · #2 12-21-2013, 11:21 AM

That is a TSB ROM that Subaru had installed at some point.

ShaneHobson · #3 12-22-2013, 01:11 AM

How is the TSB ROM different from standard ?
Why would it have been replaced ?

92snowmachine · #4 12-28-2013, 12:24 PM

subaru issued new roms to correct drive ability and starting complaints. i believe that rom is to correct a rough start when cold symptom.

SURTEESS · #5 12-29-2013, 02:00 PM

Shane TSBs (Technical Service Builds) - were quite common in USA/Canada - less common in the rest of the world.

I remember seeing a complete listing here some years ago, along with explanations.... maybe someone can point to where they are to be found?.

Most TSBs were done free of charge - due to legal requirements relating to service or safety regulations.

b3lha · #6 01-08-2014, 08:56 AM

That looks like a USDM ECU (label D1 or M7), not a JDM (label D2).

The JDM ECU doesn't have the little daughterboard with the atmospheric pressure sensor on it. The TSB rom chip is typically only present on USDM vehicles.