A/C Pressure Sensor

This is a 3-wire sensor. Pin No. 1 is signal ground to ECM pin No. 77. Pin No. 3 is 5 volt reference from ECM pin No. 74. Pin No. 2 is A/C pressure signal to ECM pin No. 14. This signal should be about 0.9 V with the A/C off. With A/C on, the signal to the ECM is about 1.4-1.8 V.