Thanks for the info Ranjam.. Those adapters you have are exactly what I have. According to the bosch website, the P/N 02001575 crosses over to my P/N 3000053 adapter. This should work and I cannot understand what the deal is with this tech 1. My Snap-on solus will read the dtc, but it will not do the functions like the tech 1. The tech 1 works perfect in my son's, 95 skylark, minus the adapters that are required for the blazer. I don't know what is wrong, but if you come with an idea, let me know. My pcm is mounted on the coolant bottle.

Thanks again,
bizzs

 

Flipping through my factory service manual;

Check your 8th digit VIN or check your RPO codes and look for either a L34 or LB4. it is most likely a "Z" or LB4 indicating a VCM controlled system which is the big black box mounted above the coolant bottle. If that is the case, you will need an additional item called a Vehicle Interface Module.

Wish I could help you find one as they are getting increasingly rare.

Send me a PM

 

I found you that Vehicle interface module you need.

Send me a PM for the info.