Exhaust Valves, Closing Angles (Ca)

The parameter corresponds to the "Camshaft shift angle" but is calculated from another reference position on the crankshaft.

The engine control module (ECM) calculates the value using signals from the impulse sensor (crankshaft position) and the camshaft sensor (camshaft position).

The value indicates when the exhaust valves close relative to top dead center (TDC) of the cylinders. The value decreases as the camshaft is guided out.

When the camshaft is in its 0 position (camshaft not guided out), the angle is 26.5°CA; when it has been guided out fully the angle is -3.5°CA.

CA = Crank Angle.