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Crankshaft Sensor Inductive (Engine Running)

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Crankshaft Sensor Inductive (Engine Running) Waveform Notes

In this particular waveform we can evaluate the output voltage from the Crank Angle Sensor (CAS). The voltage will differ between manufacturers, its proximity and engine speed. The main reason for evaluating this waveform is to monitor the output when the engine stops due to a loss of High Tension voltage (HT). The waveform will be an Alternating Current (AC) its voltage will be seen to increase with engine speed. The gap in the picture is due to the ‘missing tooth’ in the flywheel or reluctor and is used as a reference for the Electronic Control Module (ECM) to ascertain the engines position. Some systems use two reference points per revolution.