Q7 Quattro V8-4.2L (BAR) (2008)
High Pressure Sensor / Switch: Testing and Inspection
High Pressure Sensor, Checking Pressure Signal
-
Remove plenum chamber cover
-
Disconnect connector - A -.
=> [ High Pressure Sensor Connector Assignments ]
=> [ Pressure Signal from High Pressure Sensor ]
High Pressure Sensor Connector Assignments
Terminal - 1 - Ground (GND)
Terminal - 2 - signal output (square wave signal to front A/C control head Climatronic Control Module (J255))
Terminal - 3 - B+ (terminal "75")
‹› With harness connector - B - disconnected, the compressor will not switch on.
‹› The high pressure sensor - A - is an electronic component, which creates a square wave signal, the duty cycle ratio changes with pressure in the
refrigerant circuit.
Pressure Signal from High Pressure Sensor
- A - Refrigerant system pressure, high pressure side in bar (absolute pressure)