Audi Workshop Service and Repair Manuals

Adjusting accelerator position sender -G79- - right-hand drive vehicles without accelerator pedal module The accelerator position sender -G79- must be adjusted after removing and installing either the accelerator position sender -G79- or the cable cam. Special tools and workshop equipment required

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

Procedure l  Tightening torque → Chapter. –  Bolt accelerator position sender -G79- into bracket (removed earlier) → Item. –  Using a strip of sheet metal, make up adjuster tool -1- (with dimension -a-). l  Dimension -a- = 13.25 mm. –  Fit cable cam -3- loosely on shaft of accelerator position sender. –  Bring adjuster tool into contact with thread of lower securing bolt -2-. –  Bring cable eye -5- of cable cam into contact with adjuster tool -1-, as shown in illustration. –  With components in this position, measure distance between centre of cable eye and top securing bolt -4-. Make sure cable on cable cam is taut while measuring. –  Adjust according to distance -b-. l  Distance -b- = 65.59 mm. –  Secure cable cam in this position. –  Install accelerator position sender -G79- and bracket in vehicle. Vehicles with automatic gearbox: –  Remove accelerator pedal stop from vehicle floor and in its place bolt on accelerator pedal stop for vehicles with manual gearbox. l  Accelerator pedal stops for vehicles with manual gearbox: black l  Accelerator pedal stops for vehicles with automatic gearbox: grey

All vehicles (continued): –  With ignition switched off, connect vehicle diagnostic, testing and information system -VAS 5051B- with diagnosis lead to diagnosis connection. –  Start the engine and run at idling speed. Display on -VAS 5051B-: –  Select Vehicle self-diagnosis from the list -item 1-.

Display on -VAS 5051B-: –  From menu -1-, select vehicle system “Engine electronics” and press → key to continue.

Display on -VAS 5051B-: –  From menu -1-, select diagnosis function “Measured values” and press → key to continue.

Display on -VAS 5051B-: –  Press keys 62 on keypad -1- to select “Display group 062” and confirm entry by pressing Q key.

Display on -VAS 5051B-: –  Check display in display zone -3-. –  Press accelerator all the way down and hold in position. l  Specification: 72 ... 74 % (accelerator pedal depressed) –  If specification is not attained, check installation position of cable cam and adjust if necessary → Anchor. –  Check adjustment again: –  Press accelerator pedal down slowly. l  Specification: The readout in the display should increase steadily unit it reaches 72 ... 74 % (accelerator pedal fully depressed). –  Press ← key to terminate function “Measured values”.

Display on -VAS 5051B-: –  From menu -1-, select function “End output” and press → key to continue. –  Switch off ignition and unplug diagnostic connector. Vehicles with automatic gearbox: –  Reinstall accelerator pedal stop for vehicles with automatic gearbox in vehicle floor. –  Then check kick-down switch -F8-:

Display on -VAS 5051B-: –  From menu -1-, select vehicle system “Gearbox electronics” and press → key to continue.

Display on -VAS 5051B-: –  From menu -1-, select diagnosis function “Measured values” and press → key to continue.

Display on -VAS 5051B-: –  Press key 1 on keypad -1- to select “Display group 001” and confirm entry by pressing key Q.

Display on -VAS 5051B-: –  Check display in display zone -4-. –  Press accelerator pedal all the way down to full-throttle position. l  Specification: XXX0 XXXX. –  Press accelerator pedal all the way down past kick-down point. l  Specification: XXX1 XXXX.   Note Switching inputs at the locations marked “X” can be ignored during this test. –  Repeat adjustment procedure if specification is not attained. –  Press ← key to terminate function “Measured values”.

Display on -VAS 5051B-: –  From menu -1-, select function “End output” and press → key to continue. –  Switch off ignition and unplug diagnostic connector.