Cruise Control: Testing and Inspection
Cruise Control System (CCS), Checking
Special tools, test equipment and auxiliary items
- VAG 1551 scan tool or VAG 1552 mobile scan tool with VAG 1551/3B cable
- VAG 1598/31 test box
- VAG 1526 hand multimeter or VAG 1715 multimeter
- VAG 1594 adapter set
- Electrical Wiring Diagram
Test conditions
- All fuses must be OK
- Battery voltage must be at least 11.5 V
- All electrical accessories, e.g. lights and rear window defroster must be switched off
- Air conditioning must be turned off
- Selector lever of the automatic transmission must be in "P" or "N" position
Test sequence
- Connect VAG 1551 scan tool ((VAG 1552). Switch ignition on and select Motronic Engine Control Module (ECM) -J220- with "Address word" 01. Connecting scan tool and selecting Motronic Engine Control Module (ECM) -J220-.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- for function "Read measuring value block" and confirm entry with -Q- button.
Indicated on display
Read measuring value block
Input display group number XXX
- Press buttons -0-, -6- and -6- for "display group 66" and confirm with -Q- button.
Indicated on display (1 to 4 = Display zones)
Read measuring value block 66 ->
1 2 3 4
NOTE:
Vehicles with automatic transmission only:
- Perform a test drive and exceed a speed of 30 km/h (approx. 19 MPH) once. Afterward switch off engine and leave selector lever in position 2, 3 or D.
Observe the valid safety measures during a test drive.
- Engage parking brake.
NOTE: On vehicles with an automatic transmission, the CCS switch will not be supplied with voltage until the vehicle speed exceeds 30 km/h and the selector lever is in position 2, 3 or D. Once the switch has been supplied with voltage it will also remain live at idle speed provided a driving range (except 1 or R) is selected.
- Check in display zone 2 if the CCS is activated:
Specification: x x x x 1x x x
If the specification is not obtained:
- Press -> button.
- Press buttons -0- and -6- for "End output" function and confirm input with -Q- button.
- Activate Cruise Control System.
If the specification is obtained:
- Check specification for switch position from CCS operating switch in display zone 4 (last 4-digit numbers).
Check prerequisites Display zone 4
Switch B in detent at "OFF" 0001
Switch B not in detent at "OFF" 0000
Switch B at "ON" 0011
Switch B at "RES" 1011
Switch A pressed 0111
(Switch B at "ON")
If the specifications are not obtained:
- Press -> button.
- Press buttons -0- and -6- for "End output" function and confirm input with -Q- button.
- Switch off ignition.
- Remove inner plenum chamber cover, left
- Connect VAG 1598/31 test box to control module wiring harness. Motronic Engine Control Module (ECM) -J220- is not connected by this action.
- Check wiring from Motronic Engine Control Module (ECM) -J220- to CCS operating switch for open/short circuits:
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, Checking and Erasing DTC Memory.
- Read readiness code. If DTC memory has been erased or Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive, readiness code must be generated again.