Camshaft adjustment, checking
The Engine Control Module (ECM) can adapt the instantaneous load- and RPM- situation by adjusting the timing.
To do so, the total of four valves for camshaft adjustment allow more or less oil pressure to impact the mechanical adjustment mechanism.
While the exhaust camshafts only have control over a single stage adjustment, intake camshafts can be adjusted variably.
- VAS5051 with VAG5051/1
| WARNING | Test equipment must always be secured to the rear seat and operated from there by a second person. If test and measuring equipment is operated from the passenger seat, the person seated there could be injured in the event of an accident involving deployment of the passenger-side airbag. |
- VAS5051 tester connected and vehicle On Board Diagnostic (OBD) -01, Engine electronics-selected.
- Coolant Temperature at least 80°C.
- Vehicles with automatic transmission Selector lever in P or N.
- Start engine, and let run at idle.
Display on VAS5051
Scheme 398
- In selection -1-, click on the diagnostic function "04 - Basic setting".
Display on VAS5051
- Enter display group max. input value = 255
- Select function "094" in button field -2- for "display group number 094" and press Q button to confirm input.
Scheme 399
Display on VAS5051
- Activate basic setting by pressing button A.
- Depress accelerator pedal and brake pedal at the same time, engine speed increases to approx. 1900 RPM.