Cruise Control System, Checking

Cruise Control System (CCS), Checking







Special tools and equipment
- VAG 1526A
- VAG 1594A
- VAG 1598/31
- 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

WARNING: To avoid danger of accident when performing measurement and test drives, observe safety precautions.

- Connect testing and information system VAS5051 and select vehicle system "01 -Engine electronics". Ignition must be switched on. Testing and Inspection

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-.
- Road test vehicle and determine whether switch positions are shown in display zone -4-.

Display Group 066:

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

If "0" appears in display zone 2 even with activated CCS:
- Connect VAG 1598/31 test box to wiring harness for engine control module and also to engine control module. Wiring and Component Testing Using VAG1598/31 Test Box
- Connect multimeter as follows to measure voltage:

Test box VAG 1598/31 Measure to
Socket
38 Engine Ground

- 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-.