Gasoline Engines With Electronic Throttle Valve Only
Cruise Control On Board Diagnostic (OBD)
Gasoline engines with electronically-operated throttle valve only
Testing cruise control system
- Connect VAG1551 scan tool and use "Address word 01" to select engine control module. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", under "Lighting and Horns"
The engine should be idling.
Except for the control lever, there are no system components for the cruise control system. All functions are carried out by the engine control module.
Initiating "Read Measuring Value Block" scan tool function 08
Indicated on display
Rapid data transfer HELP
Select function XX
- Press -0- and -8- to select "Read Measuring Value Block" function 08.
Indicated on display
Rapid data transfer Q
08-Read measuring value block
- Press -Q- button to confirm input.
Indicated on display
Read measuring value block HELP
Input display group number XXX
- Enter display group number 066.
The engine should be idling.
- Press -Q- button to confirm input.
The measured value block which has been selected will appear in the standard format.
Display group overview
Display group number Display fields
066 1 = Actual vehicle speed km/h
2 = Switch positions of brake, clutch and cruise control (open or closed)
3 = Desired vehicle speed km/h
4 = Control lever switch posit ions
Display Group 066:
Indicated on display
Read Measuring Value Block 66 ->
0 km/h 1000 0 km/h 0000
Checking displays in display fields 2 and 4
Display check, display field 2
Read Measuring Value Block 66 ->
0 km/h 1000 km/h 0000
Test conditions Display field 2
Cruise control released (activated) 1000
Brake applied(break pedal switch) 1011
Clutch applied 1100
If the nominal value in display field 2 for "cruise control released" (1000) is not attained:
- Check engine control module identification.
- If "G" is not displayed after component name, cruise control is not activated. Activate cruise control system.
Display check, display field 4
Read Measuring Value Block 66 ->
0 km/h 1000 0 km/h 0000
Test conditions Display field
Switch -B- in "OFF" (AUS) position 0000
Switch -B- to "ON" (EIN) position 0011
Memory set, switch -B- to "OFF" 0001
(AUS) before engaging
Button -A- pressed, "SET" (FIX) 0111
Switch -B- to "RES" (AUFN) 1011
If the nominal values in display field 4 are not attained even though switch -B- is set to "ON" (0011):
- Connect VAG1598/31 breakout box to engine control module harness. Testing Wiring And Components Using VAG1598/31 Breakout Box