Cruise Control System, Checking

Cruise Control System, Checking

Special tools, testers and auxiliary items required

• (VAG1526A)

• (VAG1594A)

• (VAG1598/31)

• (VAS5051) with (VAS5051/1)

The Cruise Control System (CCS) has no components of its own (except for the operating switch). All cruise control functions are carried out by the engine control module.

Test sequence

CAUTION!
To avoid danger of accident when performing measurement and test drives, observe safety precautions. Refer to => [ Safety Precautions ] Multiport Fuel Injection.

- Connect testing and information system (VAS5051 ) and select vehicle system "01 -Engine electronics" in selection. Refer to => [ VAS 5051, Connecting and Select Functions ] VAS 5051, Connecting and Select Functions. Ignition must be switched on.

Display on (VAS5051):





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

Display on (VAS5051):





1. Enter display group

- Enter "066" for "display group number 066" in zone - 2 - and confirm entry by pressing Q button.

Display on (VAS5051):





- Check indication in display field - 2 -.

- It must be ascertained by a road test whether switch positions are shown in display zone - 4 -.





- Exit function "08 - Read measured value block" by pressing arrow button.

If "0" appears in display zone 2 even with activated CCS:

- Connect test box (VAG1598/31) to wiring harness for engine control module and also to engine control module. Refer to => [ Wiring and Component Check with Test Box VAG 1598/31 ] Wiring and Component Check With Test Box VAG 1598/31.

- Connect multimeter as follows to measure voltage:





- Switch ignition on.

• Specification for CCS switched off: 0 V

• Specification for CCS switched on: approx. battery voltage

If the specified values are not obtained:

- Check for open circuit and short to positive or Ground in following wiring connections:





- Repair any open/short circuit as necessary.

Significance of 8-digit display in display zone 4





If specifications in display zone 4 are not obtained:

- Check Cruise control switch (E45).