Audi Q7: Heating, Ventilation & Air Conditioning

 Checking Pressures on Vehicles with Expansion Valve and Receiver/Dryer (with Internally Regulated Compressor)

General Information   Note Connect the A/C service station. Refer to → Chapter "A/C Service Station, Connecting". Observe the test requirements. Refer to → Chapter "Pressures, Checking". - With the ignition switched off, check the pressure in the refrigerant circuit (u

 CAN-Bus Terminal Resistance, Checking

General Description The Engine Control Module -J623- communicates with other CAN-Bus capable control modules. The control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the CAN-bus is reco