Chapter 3 Automotive Test
67
3.2.6 Crankshaft
The crankshaft sensor is installed in many places, which can be near the front pulley or on the rear flywheel. The
ECM judges the precise position of the engine based on its output signal. Usually there are induction type and Hall
type: the induction type output is usually a sine wave, there are missing teeth on the disk, and the sine wave will be
missing in the missing teeth; this kind of sensor is generally 2-wire; the Hall type output is usually a square wave .
Generally 3-wire, power, signal, and ground. Use a BNC to banana cable, one end is connected to channel 1 of the
oscilloscope, the other end is grounded with the black plug, and the red connector is connected to the signal line of
the camshaft sensor with a needle.
Use the SATO oscilloscope to test the crankshaft position sensor, the specific operation is shown in Figure 3-16:
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