GF07.04-P-4117-02L

Camshaft Hall sensor function

4 Camshaft a 180° segment
		P07.61-2275-02

B6/2 Camshaft Hall sensor, left bank of cylinders B6/3 Camshaft Hall sensor, right bank of cylinders a Square-wave signal camshaft Hall sensor, left cylinder bank b Square-wave signal camshaft Hall sensor, right cylinder bank
		P07.61-2276-06

Detection of the camshaft position for the right and left-hand cylinder bank takes place via a Hall sensor for each side which detects the position of the segment on each camshaft. One signal is generated for each revolution of the camshaft. The signals from the right and left camshaft are offset by 480° crank angle. The signal from the camshaft Hall sensor is approx. 12 V ("high"). If the segment on the camshaft is positioned opposite the Hall sensor, the signal jumps to 0 V ("low"). The "0 V signal" from the camshaft Hall sensor of the right bank of cylinders (B6/3) is used for detecting ignition TDC of cylinder 1. The second "0 V signal" from the camshaft Hall sensor of the left bank of cylinders (B6/2) is used for detecting ignition TDC of cylinder 7.

The camshaft poosition can already be detected as the engine is stationary by the electronics for the Hall sensor. This results in an improvement in the exhaust levels because the optimal injected quantity of fuel is assigned to each cylinder immediately the engine is started. In addition the signals can be used for an emergency start of the engine if the crankshaft position sensor is faulty.