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Chapter 3 Automotive Test
109
3.3.12 Variable valve timing
Variable valve timing is achieved by adjusting the phase of the engine cam so that the intake air volume changes
with the change of engine speed, so as to achieve the best combustion efficiency and improve fuel economy. 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 is pierced into the variable valve timing signal line with a needle tip.
Use the ATO oscilloscope to test the variable valve timing (divided into single and double timing), the specific
operation is shown in Figure 3-39:
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