Audi Workshop Service and Repair Manuals

Measuring system pressure   Note To identify the cause of the fault, always perform self-diagnosis as the first step → Rep. Gr.01. Special tools and workshop equipment required

t  Automatic gearbox tester -V.A.G 1702-

t  Vehicle diagnostic, testing and information system -VAS 5051B- t  Drip tray

Procedure l  Vehicle diagnostic, testing and information system -VAS 5051B- connected up; “Vehicle self-diagnosis” and vehicle system “02 - Gearbox electronics” selected → Rep. Gr.01. l  No fault stored in fault memory → Rep. Gr.01. l  Handbrake applied.   Note System pressure should be tested on a roller dynamometer (if available).

–  Remove bolt -arrow- for system pressure hole. –  Connect automatic gearbox tester -V.A.G 1702- and tighten knurled screw. –  Start engine and run at idling speed. –  Bleed automatic gearbox tester -V.A.G 1702- (to do so, slacken off knurled screw and tighten again after bleeding).

Display on -VAS 5051B-: –  From menu -1-, select function “Measured values” and advance by pressing → button.

Display on -VAS 5051B-: –  Using keypad -1- press button 5 for “Display group 005” and confirm entry by pressing Q button.

Display on -VAS 5051B-: –  Read off ATF temperature in display zone -1-. –  Increase ATF temperature to 60 °C –  Exit from function “Measured values” by pressing ← button.

System pressure at idling speed
Selector lever position	“D”	“R”
Engine speed	Idling	Idling
System pressure in bar	3.4 … 3.8	5.0 … 6.0

If reading is above or below specification: t  Idling speed above specification - eliminate engine fault. t  ATF pump defective - check ATF pump, renew if necessary. t  Valves sticking in valve body - renew valve body. –  Switch off ignition.

–  Unplug electrical connector -arrow- for solenoid valves. –  Start engine and rev up to 2000 rpm.

System pressure at 2000 rpm
Selector lever position	“D”	“R”
Engine speed	2000 rpm	2000 rpm
System pressure in bar	12.4 … 13.2	23.0 … 24.0

If reading is above or below specification: t  ATF pump defective - check ATF pump, renew if necessary. t  Valves sticking in valve body - renew valve body. –  Exit from function “Measured values” by pressing ← button. –  Press “End output”. –  Switch off ignition and unplug diagnostic connector. Assembling l  Tightening torque:

Component	Nm
Bolt for system pressure hole	15

Assembly is carried out in reverse sequence; note the following:   Note Renew bolt for system pressure hole. –  Detach automatic gearbox tester -V.A.G 1702-. –  Interrogate fault memory and erase if necessary → Rep. Gr.01.   Note Unplugging connector causes faults to be stored.