Cruise Control System (CCS) Check
Cruise Control System (CCS), Checking
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable
NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.
- VAG 1526 Hand multimeter or VAG 1715 multimeter
- VAG 1594 Adapter set
- VAG 1598/31 test box
- Electrical Wiring Diagrams
Test prerequisites
- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- All electrical accessories, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, this must be switched off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
Test sequence
- Connect VAG 1551 Scan tool (or VAG 1552). Then switch ignition on and select Motronic Engine Control Module (ECM) -J220- with the "Address word" 01. ((VAG 1551 and Motronic Engine Control Module (ECM) -J220-, connecting and selecting). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection
Indicated on display:
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.
Indicated on display:
Read measured value block
Input display group number XXX
- Press buttons -0-, -6- and -6- for "Display group number 66" and confirm entry with -Q- button.
Indicated on display: (1 to 4 = display zones)
Read measured value block 66 ->
1 2 3 4
Vehicles with an automatic transmission
- Perform a road test and exceed a speed of 25 km/h once then switch engine off and leave selector lever in position 2, 3, or D.
Observe the valid safety precautions when carrying out a road test.
- Apply parking brake.
Continuation for all vehicles
- Check the specification for the switch position of CCS operating switch in display zone 4.
Test prerequisites Display zone 4
Switch B at "OFF", in detent xxxxxxx0
Switch B at "OFF", in detent or not in detent xxxxxx0x
Switch B at "ON" xxxxxx11
Switch A depressed xxxxx111
(Switch B at "ON")
Switch B at "RES" xxxx1xxx
- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.
If the specifications are not obtained:
- Remove wiper arms and cowl panel:
- Connect VAG 1598/31 test box to control module wiring harness. The Motronic Engine Control Module (ECM) -J220- remains disconnected.
- Check wiring for open/short circuit from Motronic Engine Control Module (ECM) -J220- to CCS operating switch:
- Check DTC memory, repair malfunctions if necessary and then erase DTC memory. Refer to "Displaying and Reading Trouble Codes/With Manufacturer Scan Tool/DTC Memory Checking and Erasing", Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection
- Read readiness code. If the DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive (B+), the readiness code must be generated again.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Reading Readiness Code" Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code", Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection