S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Replace the O-ring seal - B -. Refer to => [ Refrigerant Circuit O-Ring Seals ] See: Description and Operation/Refrigerant Circuit
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Tighten the A/C Pressure/Temperature Sensor (G395)- A -.
‹› Tightening specification: 5 Nm.
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Check DTC memory of A/C control head Climatronic Control Module (J255) and erase any displayed malfunction if necessary. Refer to Vehicle
Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
Checking the A/C Pressure/Temperature Sensor (G395) signal
‹› Electrical testing of the A/C Compressor Regulator Valve (G395) signal is described in the A/C Guided Fault Finding. Refer to Vehicle Diagnosis,
Testing and Information System VAS 5051 in "Guided Fault Finding" function.
‹› The signal from the A/C Pressure/Temperature Sensor (G395) is evaluated by the Vehicle Electrical System Control Module (J519) and sent via
the data bus system to the A/C Control Head Climatronic Control Module (J255).
‹› If a malfunction in the signal from the A/C Pressure/Temperature Sensor (G395) is recognized, then a malfunction will be entered in the Vehicle
Electrical System Control Module (J519) memory and in the A/C Control Unit Climatronic Control Unit (J255). When reading the A/C Control
Head Climatronic Control Unit (J255) memory, you will be request to check the Vehicle Electrical System Control Module (J519) memory. Refer
to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
‹› The A/C Pressure/Temperature Sensor (G395) measured values are displayed in the On board Supply (J519) measured values block. Refer to
Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function. The displayed temperature is currently not
used by the A/C Control Head Climatronic Control Unit (J255).
