This 10K needed for 160 Baud ECM is a horrible rumor created on internet that won't go away! Even the Moates website shows 10k resistor needed for all 160 Baud ECMs. 10K really messes up good data on 1227747 and other old 160 Baud ECMs by putting the ECM in ALDL mode, it increases idle and adds timing, not needed at all for data!

Other then checking codes by crossing A and B I've had no use for 10K, it is needed in $6E to start data flowing. I have no idea what else it is used for except to screw up data.