Checking cruise control system (CCS) - petrol engines with electronic throttle — AUDI

Requirements:

Vehicle diagnostic, testing and information system VAS 5051 connected up and vehicle self-diagnosis selected => Page
01-553
Engine idling

Attention:
Follow safety precautions => Page
01-553
.
Sequence of operations

Readout on VAS 5051:

From list -1- select vehicle system "01 - Engine electronics".
Wait until next readout appears.

Readout on VAS 5051:

1 -
Engine control unit identification
2 -
Immobilizer control unit identification

Touch ▸ key.

Readout on VAS 5051:

From list -1- select diagnostic function "08 - Read measured value block".

Readout on VAS 5051:

Use keypad -2- to enter "066" for "Display group number 066" and confirm by touching Q key.

Note:

On vehicles with automatic gearbox, cruise control system switch is only supplied with power at speeds in excess of 30 km/h and with selector lever set to 2, 3 or D. Power supply is then maintained even at idle, provided that gear (other than 1 or R) is engaged.

Perform test drive, exceeding a speed of 30 km/h once. Then leave engine running and selector lever set to 2, 3 or D.

Apply parking brake.

Readout on VAS 5051:

Check display in zones -2- and -4-.

4-digit display in zones 2 and 4:

Check display in zone 2.

Test condition · Display zone 2
CCS released1) · 1 · 0 · 0 · 0
Brake pedal pressed · 1 · 0 · 1 · 1
Clutch pedal pressed · 1 · 1 · 0 · 0

1)
If 0 is displayed: Activate cruise control system
=>Page
01-457

Check display in zone 4.

Test condition · Display zone 4
Switch B set to "OFF", engaged · / 0 · / 0 · / 0 · / 0
Switch B set to "ON" · 0 · 0 · 1 · 1
Switch A pressed "FIX" · 0 · 1 · 1 · 1
Switch B set to "ACTIV" · 1 · 0 · 1 · 1
Switch B set to "OFF", before engagement point (deceleration) · / / 0 · / / 0 · / / 0 · / / 1

If readings do not match specifications:

Check wiring =>Page
01-446
.

8-digit display in zones 2 and 4:

Check display in zone 2.

Test condition · Display zone 2
CCS released1) · 0 · 0 · 0 · 0 · 1 · 0 · 1 · 1
Brake pedal pressed · 0 · 0 · 0 · 0 · 1 · 0 · 1 · 1
Clutch pedal pressed · 0 · 0 · 0 · 0 · 1 · 1 · 0 · 0

1)
If 0 is displayed: Activate cruise control system
=> Page
01-457

Check display in zone 4.

Test condition · Display zone 4
Switch B set to "OFF", engaged · / 0 · / 0 · / 0 · / 0 · / 0 · / 0 · / 0 · / 0
Switch B set to "ON" · 0 · 0 · 0 · 0 · 0 · 0 · 1 · 1
Switch A pressed "FIX" · 0 · 0 · 0 · 0 · 0 · 1 · 1 · 1
Switch B set to "ACTIV" · 0 · 0 · 0 · 0 · 1 · 0 · 1 · 1
Switch B set to "OFF", before engagement point (deceleration) · / / 0 · / / 0 · / / 0 · / / 0 · / / 0 · / / 0 · / / 0 · / / 1

If readings do not match specifications:

Check wiring =>Page
01-446
.

Checking wiring

Unplug connector at CCS switch.

=> General Body Repairs, Interior; Repair Group 70; Dash Panel
General Body Repairs, Interior
Dash Panel

Connect test box V.A.G 1598/31 to unplugged connectors of engine control unit =>Page
01-453
.

Notes:

For connection of measuring instruments (e.g. voltage tester V.A.G 1527 B, portable multimeter V.A.G 1526 A), always make use of adapter set V.A.G 1594 A.
Contact numbers of connector coincide with socket numbers of test box.

Attention:
So as not to destroy electronic components, select required measuring range before connecting test leads and observe test conditions.
Check for open circuit and short to earth/positive in the following wiring.

Connector / Contact · Test box V.A.G 1598/31 / Socket
2 · 75
3 · 57
4 · 38
5 · 76
6 · Equipment and / model year dependent / to immobilizer and to / Automatic gearbox
7 · 38

If necessary, eliminate open circuit in wiring/short.