Work sequence Audi A6 C5 facelift

Work sequence

1. Connect VAS 5051 tester with VAS 5051/1 diagnostic wire with the ignition switched off. Alternately, VAG 1551 Scan Tool (ST) can also be attached using VAG 1551/3A adapter.

Note. The following description only explains implementation of On Board Diagnostic using VAG 1551 Scan tool. When using the VAS5051 tester, observe instructions in the tester's user manual.

Indicated on display

Operating modes 1 and 2 are displayed alternately

Scheme 326

Note. If nothing appears in display

See operating instructions for Scan Tool (ST).

1. Switch ignition on.
2. Switch off level control system manually (pressing button twice > 5 seconds on manual control head)
3. Press -Print- button to turn on Scan Tool(ST) printer. Indicator lamp in button must light up.
4. Press button 1 to select "Rapid data transfer" operating mode 1.

When indicated on display

Scheme 327

Note. The address word 00 initiates the automatic test sequence, i.e. it results in a DTC check on all OBD capable systems in the vehicle via rapid data transfer.

1. Press "34" for address word "Level control system".

Indicated on display

Scheme 328

1. Press -Q- button to confirm input

Indicated on display

Scheme 329

Scheme 330

1. Indicated on display after approx. 5 seconds
2. Press --> button.

Indicated on display

Scheme 331

Note. Pressing the -HELP- button will print out an overview of all of the possible functions.

1. Press button -1- twice for the "Login procedure" and press -Q- button to confirm input.

Indicated on display

Scheme 332

1. Press -Q- button to confirm input

Indicated on display

1. Press button 0, 8, 3, 6 and 7.

Indicated on display

Scheme 333

1. Press -Q- button to confirm input

Scheme 334

When indicated on display

1. Press buttons 0 and 4

When indicated on display

Scheme 335

1. Press -Q- button to confirm input

When indicated on display

Scheme 336

1. Enter display group number.
2. Press buttons 0, 2 and 0
3. Press -Q- button to confirm input

When indicated on display

Scheme 337

1. Press up arrow button to continue.

When indicated on display

Scheme 338

Note. Press down arrow button to return to GE 20.

For indication on display after expiration of 65seconds or pressure lower than 3.5 bar in pressure reservoir

Scheme 339

Note. However, the venting procedure can be aborted prematurely by exiting the display group number.

1. Press up arrow button to continue.

When indicated on display

Scheme 340

1. Press up arrow button to continue.

When indicated on display

Scheme 341

Note. Press down arrow button to return to GE 22.

For indication on display after expiration of 65 seconds or pressure lower than 3.5 bar in pressure reservoir

Scheme 342

Note. However, the venting procedure can be aborted prematurely by exiting the display group number.

1. Press uparrow - button to continue

When indicated on display

Scheme 343

1. Press up arrow button to continue.

When indicated on display

Scheme 344

Note. Press down arrow button to return to GE 24.

For indication on display after expiration of 65 seconds or pressure lower than 3.5 bar in pressure reservoir

Scheme 345

Note. However, the venting procedure can be aborted prematurely by exiting the display group number.

If the residual retaining pressure of 3.5 bar is not reached after expiration of 65 seconds, the message "...venting function aborted" appears instead of the message "venting function done".

1. Disconnect diagnostic cable from Data Link Connector(DLC)

Other filling procedures can follow according to the above mentioned scheme. The order (venting air springs - front axle, air springs -rear axle, pressure reservoir) can be specified as desired.

Note that upon exiting the filling mode, the regulation still remains manually switched off, as long as it is not switched on or a speed of v > 15 km/h is recognized.

Note. The following list refers to items in (Scheme 349).

1. Flange nut Tightening torque: 10Nm
2. Shielding piece
3. Securing piece
4. Flange bolt Tightening torque: 23Nm
5. Compressor unit
6. Flange nut Tightening torque: 23Nm
7. Spiral spring
8. Damper element Tightening torque of nut: 6 Nm

Scheme 346

Scheme 347

1. Perform a system ventilation. See «SYSTEM VENTING (ALLROAD)»(ref-196275-S03407686742005100800000) .
2. Remove stabilizer bar. See «STABILIZER BAR & BUSHINGS»(ref-153103-S35439574232003031800000) .
3. Loosen flange nut for shielding piece.
4. Loosen hose at shielding piece.
5. Remove shielding piece.
6. Loosen hose -1- and connector -2- at compressor.
7. Loosen flange nuts. NOTE: Nuts at damper element must not be loosened!
8. Remove compressor unit.

Scheme 348

1. Secure compressor element with flange nuts. Tightening torque: 23 Nm
2. Secure hose -1 at compressor unit. Tightening torque: 2 Nm
3. Connect connector -2- at compressor unit.
4. Secure shielding piece. Tightening torque: 10 Nm NOTE: Curved plastic exhaust blow-off line at compressor must not contact shielding piece when installing. Lower part of compressor and blow-off valve must not contact shielding piece at insulation material. Corrugated tube hoses with electrical wires and intake or blow-off hose of compressor must not contact insulation material of spare wheel cavity. Electrical wire for blow-off valve must not be pulled tight. Free swinging of the compressor must be ensured. Tighten hose at shielding piece. Install stabilizer bar. See «STABILIZER BAR & BUSHINGS»(ref-153103-S35439574232003031800000) .

Scheme 349

1. Remove driver's side luggage compartment side trim See «TRIM PANELS (SEDAN)»(ref-196286-S33171848242005100800000) or «TRIM PANELS (AVANT)»(ref-196286-S20077257552005100800000) .
2. Loosen connector at control module
3. Loosen Ground (GND) connection at chassis (arrow)
4. Remove control module in direction of travel.