Component Tests and General Diagnostics
Cruise Control System (CCS), Testing
Special tools and equipment
- V.A.G 1526 A.
- V.A.G 1594 A.
- V.A.G 1598/31.
- VAS 5051 with VAS 5051/1.
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 VAS 5051 and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on. Connecting VAS 5051 Scan Tool
Display on VAS 5051:
- Under -1- select diagnostic function "08 - Read measured value block".
Display on VAS 5051:
1 - Enter display group.
- Enter "066" for "display group number 066" in zone -2- and confirm entry by pressing -Q- button.
Display on VAS 5051:
- Check indication in display field -2-.
- It must be ascertained by a road test 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 field 2 even with activated CCS:
- Connect V.A.G 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 Measure to
1598/31
Socket
38 Engine ground(GND)
- Switch ignition on.
- Specification for CCS switched off: 0 V.
- Specification for CCS switched on: approx. battery voltage.
If the specified value is not obtained:
- Check for open circuit and short to positive or Ground in following wiring connections:
- Test box VAG 1598/31 Socket - 38 (Steering Column Electronics Control Module -J527 terminal)
- 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-.