2002 VX Auto Supercharge L67 Situation and symptoms After replacing the cas sensor (to solve DTC), the car won't crank (main issue). "serv error" is displayed on the dash. Instrument cluster lights up as (normal). MIL light is on but wont flash DTC when pins 5 and 6 are bridged. Anti theft light turn off when key is turned to reds (as normal). The fuel pumps and relays can be heard after turning to reds for the first time after the battery has been disconnected for awhile, afterwards no more sounds are made turning the key back and forth (until the battery is again disconnected). What has been done in attempt to fix and what happened: Battery has been fully charged, definitely works. Voltage is 14.2 and can be used to start a HQ and VE. Temporarily reconnected the original cas, no symptoms changed. Connected a gscan2 (not a tech2). Here where it gets tricky. If the battery is disconnected and reconnected after a little bit (presumably resetting the bcm) and the key isn't turned to red, the gscan recognises the BCM (and only the BCM). When the key is turned to reds, gscan loses connection and can not reestablish. (no connection to any module) But with the pcm disconnected, the bcm is initially recognised however when the key is turned to reds, while the BCM is still lost, the ABS, SRS and anti theft can now be read when the connection is reestablished. I have followed all (at least most) respective diagnostic charts (but with a gscan 2 instead of tech2). The following have been checked Fuses (visual and continuity) and audio-inspection operation of relays in both sets (the engine bay and beneath the instrument cluster). Circuit 1221 (serial data) between DTC, PCM and BCM. Earths for BCM, PCM and DTC connector. Ignition and battery feeds for PCM. I would like to add that I can only have the gscan2 for an afternoon at a time (has already been returned). Thats all I have to say, I would much appreciate any help or ideas.