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Refrigerant Pressure Sensor / Switch: Testing and Inspection
A Tech 1 scan tool displays A/C refrigerant pressure in psi. The sensor's range and corresponding display should be in the range of 0 to 450 psi. A sensor or circuit problem should set DTC 66. A poor ground at the sensor will result in a fixed high pressure value on the Tech 1 scan tool display.
Testing and Inspection