Safety Precautions And Test Procedures
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2015 Audi S4, 2015 Audi A4 Quattro, and 2014 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Incorrect repairs to the rear final 0BF and 0BE could cause the final drive to malfunction.
- Testing, assembling and servicing must be performed by qualified personnel only.
Correct Oil Level
- Make sure the rear final drive is filled to specified oil capacity. Refer to CODES, TRANSMISSION ALLOCATION, RATIOS AND CAPACITIES .
- Fix any leaks on the rear final drive, for example, on the sealing surfaces or the seals. The oil can leak out through the holes between the left -arrow 1- or right -arrow 2- chamber and the rear final drive.
CAUTION:
Rear final drive malfunction.
- Do not drive the rear final drive if there are leaks or insufficient oil.
- Leaks on the rear final drive must be corrected.
- Fill the ATF and/or gear oil if the levels are low.
- Only use ATF or gear oil available as a replacement part. Refer to appropriate FLUID CAPACITY TABLE information in MAINTENANCE article.
- If the leaks cannot be repaired, then the rear final drive must be replaced.
Rear Final Drive Performance
WARNING:
Transmission control malfunction.
- Always maintain all specifications when replacing transmission components. Only by doing so assures the performance and the response characteristics of the rear final drive 0BF and 0BE.
Replacing Transmission Components
- When replacing the All Wheel Drive Control Module -J492-, the adaptation values for the transmission mount (for example clutch wear, oil aging) must be transmitted with the Vehicle Diagnostic Tester otherwise the performance of the rear final drive will be impaired.
- When replacing a chamber or the complete rear final drive, the clutch classification must be entered again in the All Wheel Drive Control Module -J492- using the Vehicle Diagnostic Tester. If the clutch classification is not performed in the All Wheel Drive Control Module -J492- then the rear final drive performance will be impaired. When replacing a chamber, the classification identification on the rear final drive housing must be made unrecognizable. The identification of the new classification is made on the new chamber housing.
- Do not place the removed rear final drive on any of the components from the hydraulic control unit (for example, clutch valves). This could damage the components.
Replacing the Oil Pressure/Temperature Sensor -G437- and/or Oil Pressure/Temperature Sensor 2 -G640-.
- The identity of the sensor in the All Wheel Drive Control Module -J492- must be adapted using the Vehicle Diagnostic Tester after replacing the Oil Pressure/Temperature Sensor -G437- or the Oil Pressure/Temperature Sensor 2 -G640-.
- Do not replace both the Oil Pressure/Temperature Sensor -G437- and Oil Pressure/Temperature Sensor 2 -G640- at the same time because a valid sensor identity is needed for the rear final drive classification to the All Wheel Drive Control Module -J492-. If the both sensors are replaced at the same time, the All Wheel Drive Control Module -J492- will interpret this as the rear final drive is being replaced. By doing this, adaptation values in the control module will be erased and the performance of the rear final drive will be impaired.
- If both the Oil Pressure/Temperature Sensor -G437- and the -G640- must be replaced due to mechanical damage, for example, if the connector housing gets damaged, then this must be performed in two steps. After replacing the first sensor, the identity of the must be adapted in the All Wheel Drive Control Module -J492- using the Vehicle Diagnostic Tester. Do the same for the second sensor.
- If both the Oil Pressure/Temperature Sensor -G437- and Oil Pressure/Temperature Sensor 2 -G640- must be replaced at the same time due to an electrical fault, then the clutch classification must be entered into the All Wheel Drive Control Module -J492- using the Vehicle Diagnostic Tester. Additionally the ATF must be changed. Refer to ATF ON REAR FINAL DRIVE 0BF AND 0BE, DRAINING .
Torque Displacement, Checking
After the following work the function 22- Checking the torque displacement must be performed:
- Working on the rear final drive wiring
- Working on the valves: All Wheel Drive Clutch Valve -N445- and All Wheel Drive Clutch Valve 2 -N446-.
- Working on the hydraulic control unit
Refer to TORQUE DISPLACEMENT, CHECKING