Cruise Control: Service and Repair
Cruise Control System (CCS), servicing
CAUTION!
Before working on the electrical system:
- Determine the correct coding for the anti-theft radio.
- Switch the ignition off
- Disconnect battery Ground (GND) strap.
- After reconnecting the battery, re-code and check operation of the anti-theft radio.
All cruise control system functions are controlled by the applicable Engine Control Module (ECM). The processing of electronic engine controls and cruise control functions are integrated in the ECM. Other than the cruise control switches on the steering column, the clutch and brake pedal switches and related wiring, there are no separate cruise control components to be serviced.
As the electronic throttle control operations are monitored by On Board Diagnostic (OBD), Diagnostic Trouble Codes (DTC) pertaining to engine electronics that are stored in DTC memory may be relevant to cruise control function.
Always check DTC memory first before troubleshooting (Function 02)
The operating status of the cruise control system, cruise control switches, brake and clutch switches can be checked using the procedure on the following pages:
Special tools and equipment
- VAG 1551/1552 Scan Tool (ST) with VAG 1551/3 adapter cable, or VAS 5051 Vehicle Diagnostic Testing and Information System
- Connector test kit VW 1594
- Test box VAG 1598A
- Multimeter Fluke 83
- Wiring diagram
Test requirements
- Battery (B+ ) voltage at least 11.5 V
- Ground connections on engine, transmission and battery OK.
- Diagnostic Trouble Code (DTC) memory of Engine Control Module (ECM) checked and OK
- Fuse S5 OK
- Fuse S43 OK
Test sequence
NOTE:
- On some 1998 model year vehicles with automatic transmission, the CCS switch is not supplied with voltage until the vehicle speed exceeds 30 km/h (approx. 19 mph) and the selector lever is in position B, 3 or 2. Once the switch has been supplied with voltage it will also remain live at idle, provided a driving range other than 1 or R is selected.
- If the cruise control is inoperative on 1.9L TDI models, check if system is activated.
- Connect VAG 1551/1552 Scan Tool
- Switch on ignition
- Press buttons 0 and 1 to select "Engine electronics" address word 01.
Indicated on display (example only)
06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000 WSC 00000
- Press button. Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 8 to select function 08 "Read measuring value block".
- Press 0 button to enter input.
Indicated on display
Read measuring value block HELP
Input Display group number XXX
For all 1.8 Liter Turbo & 2.0 Liter engines:
- Press 0, 6 and 6 buttons to select "Display group 66".
For 1.9 Liter TDI engine:
- Press 0, 0 and 6 buttons to select "Display group 06".
- Press Q button to enter input.
Indicated on display
Read measuring value block XX ->
1 2 3 4
Refer to the following engine specific tables to interpret values in display fields 2 - 4:
- 1.8 Liter Turbo (codes APH & AWV).
- 1.9 Liter TDI.
- 2.0 Liter (code AEG).
- 2.0 Liter (codes AVH & AZG).
NOTE:
- The road speed signal in put to the ECM for cruise control function can be confirmed by performing a road test and observing that the km/h value indicated in display field 1 changes.
- Always observe the appropriate safety precautions during road test.
1.8 Liter Turbo (codes APH & AWV) & 2.0 Liter (codes AVH & AZG)
2.0 Liter (code AEG)
1.9 Liter TDI
