A5 Quattro Coupe (8T3) L4-2.0L Turbo (CAEB) (2011)
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SERVICE
For A4/S4 (8K), A5/S5 Coupe/Cabriolet (8T/8F), Audi Q5, A6, A8:
If DTCs are stored in the J255 Climate Control Module for the G395 pressure sensor, then check the system pressures and refrigerant volume.
^ If system pressures and refrigerant volume are low, check for refrigerant leaks at G395. If a leak is found, then replace the G395.
^ If the system pressure and refrigerant volume are correct, perform guided fault finding. If an implausible pressure value is found in MVB 1, field 4,
then replace G395.
Tip: Install only the improved G395. See part numbers in Required Parts and Tools.
Only for A4/S4 (8K), A5/S5 Coupe/Cabriolet (8T/8F), Audi Q5:
1. Check for these four DTC codes:
^ DTC (Vehicle Electrical System Control Module - J519- Please check DTC memory) in Climate Control Module J255, address 08.
^ DTC (A/C Pressure/temperature Sensor -G395- Incorrect Signal) in Climate Control Module J255, address 08.
^ DTC (Air Quality Sensor -G238- No signal/communication) in
^ DTC (A/C Pressure/temperature Sensor -G395- No signal/communication) in Vehicle Electrical System Control Module J519, address 09.
If DTCs a, b, d are stored only perform steps 2-6.
If all DTC's (a, b, c, d) are stored, only perform step 7.
Tip: The LIN cable connecting the J519 Vehicle Electrical System Control module to the G395 Pressure Sensor could be pinched or cut if DTCs a, b, d
are stored.
2. Check the LIN cable connecting the J519 Central Electrics Control unit to the G395 pressure sensor according to guided fault finding.
3. Check the wire terminals in the connector at the G395 pressure sensor for proper attachment, possible corrosion, and for any pins that may be pushed
back or widened.
4. Check to make sure there is proper voltage going to the sensor and verify the ground is not intermittently open (wiggle test).
5. Check the integrity of the wire harness.
There are two known sections in the wiring harness that can be affected, but the potentially affected areas are not limited to these two known sections.
One of the known sections is in the driver's footwell area where the wire harness enters the interior of the car from the engine bay (Figure 1).