| To determine whether the ignition coil is damaged, the following methods can be used: Observing the vehicle's condition: When idling, if the body shakes significantly and the exhaust flow from the exhaust pipe is intermittent, accompanied by severe shaking and "popping" sounds, it may be due to a damaged ignition coil. During driving, if the engine speed is below 2500 revolutions per minute and the vehicle body shakes noticeably and the acceleration is weak, it may also be a problem with the ignition coil. Check the appearance of the ignition coil: if there is glue overflow, bulging, or bursting on the outer shell, if there is burning or melting on the high-voltage connecting pipe, if there is burning inside the high-voltage output end, if there is rust on the outer shell or high-voltage end, a new ignition coil needs to be replaced. Replacement method detection: With the engine started, sequentially unplug the plugs on the ignition coils. If the shaking of the car engine intensifies after unplugging a certain plug, it indicates that the ignition coil is in good condition; If the engine shaking does not change after unplugging the plug, it means that the ignition coil is damaged. Use a multimeter to check: After the engine is started, for the 3PIN or 4PIN plug, sequentially check that+B (power) is about+12V, IGT (ignition signal) is generally 3V-5V, IGF (ignition confirmation signal), GND (ground) is 0V. If the values are normal, it may be a problem with the ignition coil or spark plug. For the 2PIN plug, check the vehicle end wiring harness. When the ignition switch is turned on, measure whether the positive terminal of the wiring harness connection is a normal 12V battery voltage. When the ignition switch is turned off, measure the resistance of the primary and secondary coils. Intuitive judgment method: Use an infrared thermometer or touch to determine whether the ignition coil has an internal short circuit or open circuit fault. For example, if the surface temperature of the ignition coil is greater than 95 ℃, it indicates an internal short circuit and needs to be replaced; When the surface temperature of the ignition coil is equal to the ambient temperature during startup, it indicates an internal circuit breaker and needs to be replaced. High voltage ignition test method: In the case of low output voltage of the ignition coil, pull out the high-voltage wire end of the spark plug, place the wire end 3-6 millimeters away from the cylinder body, or connect the spare spark plug to the high-voltage harness to start the engine for ignition test. If the spark is weak or discontinuous, the ignition coil should be replaced. But it is necessary to first confirm that the control signal is normal and provide insulation protection. |
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