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.
Camshaft adjustment (exhaust), checking
Indicated on display of VAS 5051
- Enter display group: max. input value = 255
- Select function "090" in button field -2- for "display group number 090" and press Q button to confirm input.
Indicated on display of VAS 5051
Scheme 325
Camshaft adjustment (intake), checking
Indicated on display of VAS 5051
- Press s -button to change into display group 091.
Valves for camshaft adjustment (intake), activating
- Initiate output Diagnostic Test Mode (DTM) and activate valve for camshaft adjustment bank 1
Display on VAS5051
Scheme 326
- Actuator test is waiting Advancing by switching required
5 - Bank 1, camshaft adjustment, -N205
- Click on - button.
Display on VAS5051
- Actuator test is running Advancing by switching allowed This valve is activated for approx. 1 minute (clicks), unless button is pressed first to switch to the next actuator.
- Click on - button
Display on VAS5051
Scheme 327
- Actuator test is waiting Advancing by switching required
6 - Bank 2, camshaft adjustment => -N208
- Click on - button
Display on VAS5051
- Actuator test is running Advancing by switching allowed This valve is activated for approx. 1 minute (clicks), unless button is pressed first to switch to the next actuator.
- End function "03 - output Diagnostic Test Mode (DTM)" by pressing button.
If one of the valves is not being activated (does not click).
- Switch ignition off.
- Perform an electrical test for the valves for camshaft adjustment, see «ELECTRICAL TEST OF SOLENOID VALVE FOR CAMSHAFT ADJUSTMENT»(ref-196254-S39283224862006041700000) .
Valves for camshaft adjustment (exhaust), activating
- Initiate output Diagnostic Test Mode (DTM) and activate valve for camshaft adjustment (exhaust) bank 1
Display on VAS5051
Scheme 328
- Actuator test is waiting Advancing by switching required
7 - Bank 1, valve for camshaft adjustment (exhaust)
- Click on - button
Display on VAS5051
- Actuator test is running Advancing by switching allowed This valve is activated for approx. 1 minute (clicks), unless button is pressed first to switch to the next actuator.
- Click on - button
Display on VAS5051
Scheme 329
- Actuator test is waiting Advancing by switching required
8 - Bank 2, valve for camshaft adjustment (exhaust)
- Click on - button
Display on VAS5051
- Actuator test is running Advancing by switching allowed This valve is activated for approx. 1 minute (clicks), unless button is pressed first to switch to the next actuator.
- End function "03 - output Diagnostic Test Mode (DTM)" by pressing button.
If one of the valves is not being activated (does not click).
- Switch ignition off.
- Perform an electrical test for the valves for camshaft adjustment, see «ELECTRICAL TEST OF SOLENOID VALVE FOR CAMSHAFT ADJUSTMENT»(ref-196254-S39283224862006041700000) .
Electrical test of solenoid valve for camshaft adjustment
Cylinder bank 2 (left)
- Remove cover -1- in engine compartment (left side).
- Remove coolant reservoir (arrow)
- Remove line from Engine Coolant Level (ECL) Warning Switch -F66- and lay coolant reservoir to side.
Note. Coolant hoses 1 to 3 remain connected.
Scheme 330
Cylinder bank 1 (right)
Scheme 331
- Remove cover -1- in engine compartment (right side).
- Remove bolts (arrows).
- Remove air guide -1-.
- Disconnect Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- -1- at air filter housing.
- Remove air filter housing (arrows).
Continuation for both cylinder banks
- Disconnect harness connector (arrow) from connector-adapter.
Note. Illustration depicts cylinder bank 2 (left).
