V50 T5 AWD L5-2.5L Turbo VIN 67 B5254T7 (2008)
Detecting the reference positions of the camshaft
The crankshaft has four reference positions, one for each camshaft flank. The reference positions are predetermined points on the flywheel. The
reference positions are detected using the signal from the engine speed (RPM) sensor. See also: Design See: Powertrain Management/Computers and
Control Systems/Description and Operation/Engine Control Module (ECM)/Design
The camshaft turns at half the speed of the crankshaft. This means that two reference positions are detected for each turn of the crankshaft. Therefore two
engine revolutions are required to detect all flanks on the camshaft.
The positions on the flywheel are designated °CA (Crank angle). 0°CA = Top dead center cylinder 1.
Flanks 3 and 4 are detected during the second revolution of the engine.
