1998 Volvo V70 check engine light

I barely remember an issue like this one. The A/C pressure switch and the atmospheric pressure sensor are tied together in that circuit. What you need to verify is that you do not have a short to ground in the signal wire. The last time I ran into this problem was a defective A/C pressure sensor that was the root cause. But that does not mean that the atmospheric pressure sensor or the accelerometer sensor has not failed either?
If I were to guess I would say the A/C pressure sensor has failed? The sensor is located on the A/C high pressure line. The connector has 3 wires. Wire colors will be brown with a pink stripe, blue with orange stripe, and voilet with white stripe.