How can you tell if your ignition coil is broken?

When you find that the car has one of the following phenomena, you can basically judge whether the ignition coil is in addition to the problem
1. In the idle state, the body shakes obviously, observing the exhaust pipe mouth, the exhaust gas flow discharged by the car has obvious intermittent, and the exhaust pipe shakes badly. You can clearly hear the "sudden" sound.
2. During driving, when the speed is below 2500 rpm, the body is obviously shaky and the acceleration is weak; After more than 2500 revolutions, the jitter disappears.
3. Open the engine cover, observe the running engine and find that the engine has obvious shaking, this jitter is obviously not the normal jitter in the working state of the engine, and the jitter amplitude is very large.

If only one ignition coil sends a fault, the remaining three cylinders work normally, barely emergency driving is not a problem, but it is very unfavorable to the car engine, machine base and connecting parts. It is recommended that the owner temporarily stop using the vehicle with a lack of cylinders.

How can you tell if the ignition coil is broken? The exclusion steps are as follows:
1. Set the ignition switch to NO
2. Unplug the ignition coil on the wiring harness and use a multimeter to detect whether there is a battery voltage of about 12V between pin three and the ground wire on the pillow
3. Unplug the ignition coil on the wiring harness and use a multimeter to detect whether pin 1 on the connector and pin 5 of the ECU are short-circuited or short-circuited
4. Unplug the ignition coil on the wiring harness and use a multimeter to detect whether pin 2 on the connector and pin 2 of the ECU are short-circuited or short-circuited
5. Check whether the primary coil resistance of the sensor is about 0.9Ω
6. Check whether the secondary coil resistance of the sensor is about 14.5Ω
7. Use the visual wave meter to detect whether the secondary ignition waveform of the ignition system high-voltage line is normal