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1228746 ECM Information $61 This ECM was used in 1989 to 1992 F and B Cars, LO3 (5.0L) and LO5 (5.7L) engines.
Some B cars, Caprice, Buick etc... used 16136965 $62
Click Here for details on how to read error codes known as Check Engine Light (CEL) or Service Engine Soon (SES) can be found in this thread.
*Work in progress*
Wiring diagrams for the 1228746.
TunerPro Definition files for 1228746 ECM $61
Here's a few bin files I have for the 1228746. These are known good bin files. There are many bin files recalled by GM and superceded with a new BCC. The chip would be replaced in your ECM so the BCC code on the ECM cover could be wrong. Need to look for BCC on chip inside ECM cover.
Still need good bins for 5.7L Auto and Manual.
I don't have any records for it being used in 4.3L or 7.4L engines.
More bins...
$61 Hac Disassembly 1228746 ECM