Coil Breaks And Short-Circuits Cannot Be Recognized. The Basic Alternator Function Is In Operation Even If The BSD Interface Fails.
Note. The alternator regulator voltage is influenced by the ECM - BSD interface. The battery charge voltage can therefore be up to 15.5 V, depending on the battery temperature. If a battery charge voltage of up to 15.5 V is measured, the regulator is not faulty. A high charge voltage indicates a low battery temperature.
Principle of Operation
The Valvetronic system is a combination of VANOS and valve lift adjustment . This combination of abilities allows the ECM to control when the intake valves are opened and closed, and also the opening lift. The intake air flow is set by adjusting the valve lift while the throttle valve is fully opened. This improves cylinder filling still further and reduces fuel consumption.
Each cylinder head in the N62 engine has a Valvetronic assembly. This Valvetronic assembly consists of a bridge support with eccentric shaft, intermediate levers with retaining springs, drag lever and the intake camshaft.
In addition, the following components belong to the Valvetronic system
Scheme 895
- A Valvetronic motor for each cylinder head
- A Valvetronic control module
- A Valvetronic sensor for each cylinder head
The intake valve lift can be adjusted to anywhere between 0.3 mm and 9.85 mm.
The cylinder heads are precision manufactured together to ensure precise flow rate and uniform distribution. The valve gear components on the intake side are precisely matched together to the tightest limits.
The bridge support, lower eccentric shaft and inlet camshaft bearings are matched together in the cylinder head once it is assembled. If the bridge support or the lower bearings are damaged, the entire assembly must be replaced.