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112
3.4.1 Primary
The ignition system of a gasoline car usually consists of a primary coil, a secondary coil and a spark plug. There are
traditional ignition systems and electronic ignition systems. Currently, most car models already use electronic
ignition systems. The primary circuit has developed from the basic contact type and capacitive type to the system
with no distributor and one coil per cylinder that is commonly used today.
Use a P130A probe, connect one end to channel 1 of the oscilloscope, and connect the other end to the ground with
the black clip. Use a stinger to pierce the ground wire of the primary coil and hook the probe to the metal needle of
the stinger; use a current clamp to connect the other end to channel 2 of the oscilloscope. Clamp the other end on
the power cord of the primary coil, pay attention to the direction of the current (if you need to test the current,
connect a current clamp).
Use the ATO oscilloscope to test the primary ignition coil (the voltage, current, voltage + current, signal can be
tested separately to help users troubleshoot possible faults), the specific operation is shown in Figure 3-40:
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