1995 Jaguar XJ6

Computer problem
1995 Jaguar XJ6 6 cyl Two Wheel Drive Automatic 110 miles

I have a 95 xj6. The problem I am having is when I plug the obdii sensor into computer it reads no link. I have tested all the pins and they all have ohms readings. But no computer codes. If I unplug a blue wire connector under the center console next to a couple other connectors then the odbii sensor will read other computer information but not the ECM. I dont know what I am not troubleshooting.
June 2, 2010.

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