Camshaft Adjustment Function, Checking
Required special tools and test equipment
- VAG 1551 Scan Tool (ST) with VAG 1551/3 adapter cable
- Multimeter US1119 (Fluke 83 or equivalent)
- VW1594 connector test kit
Function
The camshaft adjustment is dependent on engine speed and load. The electrical solenoid valves for camshaft adjustment (-N205- and -N208-) are switched to apply oil pressure to the mechanical camshaft adjusters, which adjusts the camshaft timing.
- Connect VAG 1551/1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (engine running at idle).
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block HELP
Input display group number XXX
- Press buttons -0-, -9- and -0- to input display group number 90 (090), and press -Q- button to confirm input.
Indicated on display (1-4 display groups)
Read Measuring Value Block 90 ->
1 2 3 4
NOTE:
Display field 2 indicates whether the engine control module has activated the camshaft adjustment.
- "CS-ctr/OFF" camshaft adjustment is not active.
- "CS-ctr/ON" camshaft adjustment is active (this can only be attained during a test drive)
Display fields 3 and 4 show whether the camshaft adjustment did actually occur (via input from sensors):
- Normal Position: -3.0 ° to 6.0 ° KW.
- Shifted position: 16.0 ° KW to 25.0 ° KW.
NOTE: If, during the test drive, display field 3 and/or 4 displays a value between 6.0 ° KW and 16.0 ° kW, the electrical valves for camshaft adjustment have switched the oil pressure to the respective mechanical camshaft adjuster but it cannot attain the correct end position (e.g. due to sluggishness).
WARNING!
A second technician is required to operate the VAG 1551 scan tool during the road test. Safety precautions. Technician Safety Information
- Accelerate from rest in 1st gear (manual) or with selector lever in "2" position (automatic).
- Check specified values for camshaft adjustment (display fields 2-4)
Display Group 90:
If specified values are attained:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.