XC90 FWD L6-3.2L VIN 98 B6324S (2007)
1. High lift
2. Low lift
To maintain low fuel consumption at different loads and engine speeds, there is a system for variable camshaft profile (CPS, Cam Profile Shifting) that
can vary the duration and lift height of the valves on the intake camshaft.
Duration = part of the rotating camshaft's revolution that the camshaft acts on the valve.
The system is made up of hydraulic valve depressors where the Engine control module (ECM), via oil channels, can set the valve depressors in two
positions, one low position and one high position.
At start and at low temperatures (oil temperature below +40 °C, the system is pressureless and thus in its low position (spring loaded).
To minimize stresses the Engine control module (ECM) pressurizes the depressors that are not loaded at the moment. For this, two cam profile solenoids
Cam profile solenoid 1 (CPS1) supplies cylinder 1, 2, and 4, and cam profile solenoid 2 (CPS2) supplies cylinder 3, 5, and 6 with pressurized oil.
The following components are used for oil monitoring:
oil level sensor (7/35)
engine control module (ECM) (4/46)
driver information module (DIM) (5/1).
The oil level sensor, via the driver information module (DIM), is used to inform the driver if oil filling is required.
Detecting the oil level
The integrated electronics of the sensor calculates the oil level using the measured value for the oil temperature.
For the correct oil level to be calculated, temporary oil level changes in the oil trough must also be included in the calculation, which can occur when
driving on hills, around bends or similar for example. The engine control module (ECM) makes these calculations using the oil level sensor signal and a
number of other parameters, for example, vehicle speed signal and load signal.
Controlling the cruise control