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Chapter 3 Automotive Test
61
3.2.4 Camshaft
The camshaft sensor is generally used for timing, and is often tested in conjunction with the crankshaft sensor to
determine the timing of the vehicle. There are one or two camshaft sensors in the common car models, and the use
of four is relatively small. Common camshaft sensors are Hall type/induction type/AC excitation type;
Hall sensor output is square wave, high voltage can be 5V or 12V; generally 3-wire, power, signal, ground;
inductive sensor output is a sine wave signal or square wave signal, generally 2-wire; AC excitation The output of
the type sensor is multiple sine waves (there is a missing piece at the end of the camshaft, so that the signal
changes, and the position of the No. 1 cylinder is judged at the missing place), generally 2-wire.
Use a BNC to banana cable, connect one end to channel 1 of the oscilloscope, the other end of the black plug is
grounded, and the red connector uses a needle to connect the signal line of the camshaft sensor.
Shown in Figure 3-13:
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