DDS-3 version 8 map sensor problems

[benchmark]

Hello,

We have a system hooked up with the J link set to map for sensed pressure, but the pin 17 has a 4volt output without it being hooked up to our 2-bar map sensor. The signal wire from our sensor reads 2.1 volts at atmosphere pressure but when hooked up to pin 17 instantly goes to 4 volts both at pin 17 and at our sensor?

Any help?

Thanks
Mike