Quote Originally Posted by 57 Handyman View Post
Is the wiring actually different between the ALDL and the square OBDII?
OBDII started in 1996, and has different wiring.

OBDI ALDL with 160 Baud will use Pin E.
OBDI ALDL with 8192 Baud will use Pin M.

Generally GM passenger cars started using OBD1 ALDL Pin M with 8192 Baud in 1990.
Generally GM Light Trucks started using OBD1 ALDL Pin M with 8192 Baud in 1993.

The 16168625 computer is OBDI ALDL Pin M with 8192 Baud.

I'm very fortunate to live in an area with several salvage yards close by. I sometimes overlook that some members are not nearly as fortunate with salvage yard selection as I am. What is likely less than a 5 minute part search in a salvage where I live, could be a nightmare to find for some members.

dave w