A/T - Chirp/Hoot/Squeak On 3-4 Shift
37 Chirping, hooting, squeaking noise when shifting between 3-437 10 02
2013023/9
April 30, 2010.
Supersedes Technical Service Bulletin Group 37 number 08-17 dated December 16, 2008 for reasons listed below.
Affected Vehicles
Condition
^ Noises: Chirping, hooting, squeaking when shifting up and down 3-4; 4-3.
^ Vibrations: Shudder during the control phase of the torque converter clutch.
Technical Background
The torque converter clutch briefly generates (about 500 ms) noises or vibrations/shuddering when changing gears.
Note:
This only applies to vibrations/shuddering during the control phase of the converter control/converter close.
This converter condition can be checked in MVB 007/3 (converter open/converter control closed).
Production Solution
Optimized ATF (blue) introduced gradually in production years 2005 and 2006.
Service
SVM Update Instructions
1. Follow all instructions in the attached TSB 2011732 00 Software Version Management (SVM), operating instructions.
2. Update the Transmission Control Unit (J217) using the SVM action code as listed in the table above if necessary.
3. When the software update is complete, all the adaptation values of the shift elements in the transmission control unit are deleted. An adaptation drive (Refer to Adaptation Drive Procedure below) is therefore necessary to ensure shift quality. Do not perform adaptation drive until after final ATF change.
4. Drain and fill ATF; then perform flush procedure. (Refer to Flush Procedure below.)
^ On the A8 4.2L, use only ATF specification G 055162A2 (blue). Check and correct level according to the Repair Manual.
^ On the A8 W12, use only ATF specification G 055005A2 (gold). Check and correct level according to the Repair Manual.
5. Drain and fill with new ATF. Check and correct level according to the repair manual.
6. Perform adaptation drive. (Refer to Adaptation Drive Procedure below.)
The complaint may persist for 300-500 miles after the final ATF change. If complaint persists after 500 miles, contact the Technical Assistance Center.
Flush Procedure
Notes:
^ Before raising a vehicle with air suspension, activate the jack mode.
^ Raise the vehicle until all the wheels are about 8 inches of the ground.
^ Never run engine without ATF or tow the vehicle.
^ Do not exceed 35 mph.
Warning:
Adhere to all safety requirements.
1. Observe the gear indicator display in the instrument cluster. Start the engine and release the hand brake.
2. Depress the brake pedal and select D.
3. Carefully accelerate to 30 mph and hold this speed for 5 seconds.
4. Press the brake pedal until the wheels stop spinning.
5. With brake pedal depressed, select R. Accelerate to 12 mph and hold this speed for 5 seconds.
6. Press the brake pedal until the wheels stop spinning.
7. Repeat steps 2 through 6 five times.
8. When wheels are stationary, select P and switch off the engine.
Adaptation Drive Procedure
1. Drive vehicle with low engine performance until the ATF temperature reaches 60°C. (ATF temperature must not exceed 100°C.)
2. With brake pedal depressed, vehicle completely stopped and engine at idle, switch gear selector from N to D for 3 seconds repeat 5 times. Perform the same procedure from N to R.
3. Shift from 1st to 2nd while driving at low load and shift down from 2nd to 1st. Repeat 5 times.
4. Drive at low engine load (engine torque between 80 Nm and 100 Nm refer to 02 automatic gearbox, MVB 09, 1st display value) till the transmission has shifted in to 6th gear (vehicle speed between 50 and 60 mph). Stay in 6th gear for 60 seconds. Let the vehicle roll to a standstill, with gentle brake application at the end. Repeat four times. The aim is to shift up and down under a very light engine load.
Warranty
Required Parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.
Attachment - 00 Software Version Management (SVM), operating instructions