I have an 85' Camaro with the MPFI V-6. I tried to hook up my scan tool to it and it says no data at ALDL. Now, I plug in the cheap code decoder that you buy at any auto parts store, and that works just fine. Go figure! I know the scan tool works because I use it on my 88' TA and it works great, so if anyone can give any insight, it would greatly be appreciated. Thanks.

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88'TA 305TPI 330HP, NATURALLY ASPIRATED, PASSES N.J. EMMISIONS. "I AM JUST THAT GOOD"

 

There was an ECM change between those years. The later model cars (88-up) used ECM's with a baud rate of 8192. The earlier ECM's had a baud rate of 160. The pinouts for the data line also changed: The 160-baud ECM's used pin "E" for the data, 8192-baud units used pin "M".

The cheap scan tool works because the function of pins "A" and "B" (ground & diagnostic) never changed between ECM types.

I'd imagine you just need a different cable, or to configure your tool appropriately? Check out these two pages for info on baud & pinouts:
http://www.techedge.com.au/vehicle/aldl/8192/8192hw.htm http://www.techedge.com.au/vehicle/aldl/160/aldl_hw.htm


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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