The AutoXray EZ-Read 2000 scan tool can be used to connect to the DRB III port under the steering column. You must make up 3 jumpers to go from the LH connector under the dash to the Chrysler AutoXray connector cable. Hope this helps others. Unfortunately, I still couldn't get a breakdown of whether code 66 was a problem communicating with the PCM or the BCM. I guess it is just the OBD II that use the four digit codes listed in the Haynes manual.
AutoXray term. LH connector
1 6
3 5
4 1
See diagram. Also available at http://www.autoxray.com/9495lh.htm


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