A341833 2050725-

34 Special diagnosis instructions: hydraulic pump checking
34 18 33 2050725/1 June 27, 2018.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A3
2017
All
With 0GC 7 speed S-tronic transmissions
A3
2018
000001 - 022977
With 0GC 7 speed S-tronic transmissions
Condition
Depending on the DTCs that are stored in the transmission control module (TCM) the Audi Technical Assistance
Center may request you perform this Technical Service Bulletin to diagnose the correct repair for the vehicle.
Tip: Only use this Technical Service Bulletin if the Audi Technical Assistance Center (TAC) has directed you
to perform it.
Technical Background
The cover of the auxiliary hydraulic pump inside the gearbox might be loose or out of specification.
The final drive gear could chafe on the pump cover of the auxiliary hydraulic pump.
In order to see the drive shaft of the auxiliary hydraulic pump, the pump motor (Figure 1, position 3) has to be
removed. The depth of the drive shaft can be used to check the cover position.
Page 1 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 1. 0GC gearbox parts.
Position 1: Auxiliary mechanical hydraulic pump (driven by V475).
Position 2: Electrical connection of Transmission Fluid Auxiliary Hydraulic Pump 1 V475.
Position 3: Transmission Fluid Auxiliary Hydraulic Pump 1 V475.
Position 4: Main ATF pump (driven by the transmission input shaft).
Production Solution
Improvements to the auxiliary hydraulic pump.
Service
If you have not already provided the transmission code and identification information (Figure 2) to the Audi
Technical Assistance Center please enter the information into the contact. The procedure is only for
transmissions built before a certain date. The Audi Technical Assistance Center needs this information before
this TSB can be performed.
The transmission code and identification information is engraved on the transmission (Figure 2). In the example
of Figure 2:
 Gearbox code = STA
Page 2 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
 Transmission build date format is Day-Month-Year
 Transmission production date: 300916 = 30.09.2016 or September 30th 2016
Figure 2. Transmission code and identification.
Audi Technical Assistance Center requires the production date. Once they have the production date and have
directed you to perform this TSB, complete the following:
1. Check for metal shavings in gearbox:
a. Remove the mechatronic unit according to the repair manual.
b. Check the magnet for gear actuator 2/6 for metallic deposits. Look through lower hole closest to the
bellhousing (Figure 3) to see the selector fork magnet. The example shows the selector fork magnet with
metallic deposits.
c. Take a picture of the magnet and attach the
picture to the Audi Technical Assistance Center
Contact
Figure 3. Selector magnet for gear actuator 2/6.
2. Checking axial clearance of the auxiliary mechanical hydraulic pump:
a. On Quattro vehicles, remove the bevel box according to the repair manual. If the vehicle is not Quattro
move on to the next step.
Page 3 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
b. Remove the Transmission Fluid Auxiliary Hydraulic Pump 1 V475 according to the repair manual.
Tip: A cup of ATF may come out of the transmission when V475 is removed.
c. Now you can see the drive shaft of the auxiliary hydraulic pump. The auxiliary hydraulic pump in the
gearbox is constructed as shown in the example (Figure 4):
Position 1: Cover of auxiliary hydraulic pump.
Position 2: Pump impeller.
Position 3: Drive shaft.
The drive shaft has an axial play, which is
normal and shown. If the drive shaft has too
much play (in direction of the large arrow), the
cover (pos. 1) is loose and the drive shaft
moves with the pump impeller, (pos. 2) towards
the inside of the gearbox.
Figure 4. Structure of auxiliary hydraulic pump.
d. Check the axial clearance of the drive shaft with a dial caliper. Position the caliper as shown in examples
below (Figure 5 and 6):
Page 4 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 6. Close-up of caliper positioning.
Figure 5. Caliper positioning (transmission
removed for pictures).
f. Record the measurement to the 2nd decimal place for example: 18.02 mm.
Tip. Audi Technical Assistance Center Contact.
3. Attach your pictures and findings to the Technical Assistance Center Contact.
4. Contact the Audi Technical Assistance Center for the correct repair.
Warranty
Claim Type:
 110 up to 48 Months/50,000 Miles.
 G10 for CPO Covered Vehicles – Verify Owner.
 If vehicle is outside any warranty, this Technical Service Bulletin is informational
only.
Service Number:
3479
Damage Code:
0010
Page 5 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Labor Operations:
Remove and install mechatronic unit
3511 1915
250 TU
Check gearbox (for metal shavings)
3435 0199
10 TU
Loosen and attach drive shaft (Front-wheel
drive only)
4041 0999
40 TU
Remove and install bevel box (Quattro Only)
3970 1912
370 TU
Remove and install hydraulic pump motor
3479 1999
30 TU
Measure hydraulic pump shaft
3479 0399
30 TU
Transmission remove + reinstall
3435 1999
(Quattro)
620 TU (Quattro)
3435 1920
560 TU (Front
Wheel Drive)
(Only with TAC Authorization)
(Front Wheel
Drive)
Diagnostic Time:
Claim Comment:
GFF
0150 0000
Time stated on
diagnostic protocol
(Max 50 TU)
Road test prior to service procedure
No allowance
0 TU
Road test after service procedure
0121 0004
10 TU
As per TSB #2050725/1
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.
Required Parts and Tools
Required parts cannot be included in this TSB as there are different repairs depending on the findings.
Special Tools: A Digital, Dial or Vernier Caliper that can make metric depth measurements is required
There are 2 available special tools or you can use an equivalent Digital, Dial or Vernier Caliper tool of your own:
 VAS5277 Pocket Vernier Caliper
 VAS6335 Digital Caliper
Page 6 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Additional Information
All parts and service references provided in this TSB (2050725) are subject to change and/or removal. Always
check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the
Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2018 Audi of America, Inc. All rights reserved. Information contained in this document is based on the latest
information available at the time of printing and is subject to the copyright and other intellectual property rights of
Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these
materials be modified or reposted to other sites without the prior expressed written permission of the publisher.
Page 7 of 7
© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.