A/C Pressure/Temperature Sensor 3 -G827-, REMOVING AND INSTALLING: Installing

Install in reverse order of removal and note the following:

• From the start of production (through approximately the middle of 2016), the sensors that are identical in construction (A/C Pressure/Temperature Sensor -G395-, A/C Pressure/Temperature Sensor 2 -G826- and A/C Pressure/Temperature Sensor 3 -G827-) are already installed by the manufacturer with a coded address corresponding to their component location. This address cannot be changed.
• Only install the sensors (A/C Pressure/Temperature Sensor -G395-, A/C Pressure/Temperature Sensor 2 -G826- and A/C Pressure/Temperature Sensor 3 -G827-), which cannot be addressed, at the component location assigned to them. Refer to OVERVIEW - REFRIGERANT LINES .
• Sensors, which are already pre-addressed, are received as a replacement part in one set (with 3 sensors addressed differently) or only together with the corresponding refrigerant line. Refer to the Parts Information.
• From the middle of 2016 addressable sensors are installed as a running change and available as a replacement part. These sensors can be addressed according to their component locations. Use the Vehicle Diagnostic Tester.
• Do not install any the A/C Pressure/Temperature Sensors -G395-, -G826- and -G827- of a different version (with and without coded address). If interchanged there can be problems with the allocation of the sensors without coded addresses. If necessary also replace the other sensor with a sensor of the same version (with or without the printed name -B-).

-- Check the connection -4- for contamination or damage. Clean or replace the refrigerant line if necessary.

Courtesy of AUDI OF AMERICA, LLC

-- Replace the O-ring seal -3- and coat lightly with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .

-- Install the sensor -2- and tighten.

-- Evacuate and fill the refrigerant circuit. Refer to Refrigerant Circuit (R134a) (Refrigerant R134a Servicing, Refrigerant Circuit, Working with A/C Service Station) or Working with A/C Service Station (R1234ya) (1 of 2) or Working with A/C Service Station (R1234yf) (2 of 2) .

-- If the A/C Pressure/Temperature Sensor 2 -G826- is replaced (addressable versions), perform an addressing.

Procedure 

-- Connect the Vehicle Diagnostic Tester.

-- Select Diagnostic  mode and start the diagnosis.

-- Select the Test plan  tab.

-- Press the Select custom test  button and select the following tree structure in order:

• Body
• Heating, Ventilation & Air Conditioning
• OBD-capable systems
• C5 - Thermal Management Control Module - J1024
• C5 - Basic setting
• → Pressure-temperature sensors automatic addressing

-- Initiate the basic setting of the A/C system through the Thermal Management Control Module -J1024- and activate the power-controlled valves using one of the routines stored there. "Charge/flush the refrigerant circuit stop routine" using the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.

-- Start the A/C system after charging the refrigerant circuit. Refer to A/C SYSTEM, STARTING AFTER CHARGING REFRIGERANT CIRCUIT .

-- Then retrieve the DTC memory using the Vehicle Diagnostic Tester.