Can a Multimeter Measure the Condition of an Igniter?
2 Answers
An igniter cannot be measured with a multimeter; its condition can only be analyzed based on its function and fault symptoms. Below is an introduction to igniters: Components: An igniter mainly consists of a power source, ignition coil, distributor, ignition switch, spark plug, additional resistor and its short-circuiting device, as well as high and low voltage wires. Principle: The principle of an igniter is that after power is applied, the inverter circuit operates, generating a high-frequency high voltage applied to the discharge electrode, causing spark discharge to produce an electric spark, which is then used to ignite combustible gas. Types: Electronic pulse igniters, electronic high-frequency high-voltage igniters, and coil silicon steel sheet igniters.
A multimeter can indeed be used to test the condition of an ignition coil. I've tried it myself a few times before. First, set the multimeter to the resistance measurement mode, also known as the ohmmeter setting. Disconnect the power supply to the vehicle's ignition coil to avoid accidental short circuits caused by touching live wires. Then, use the multimeter probes to touch the primary and secondary terminals of the ignition coil. Generally, the primary resistance should be between 0.5 to 2 ohms, while the secondary resistance should be around 6000 to 10000 ohms, but this can vary depending on the vehicle's specifications—check the manual for exact values. If the measured resistance is too low, it might indicate an internal short circuit; if it's too high, it could mean an open circuit or poor contact. This method helps you make a preliminary assessment of whether the ignition coil is faulty. However, I should mention that a multimeter only measures static resistance, and ignition issues can sometimes be dynamic, such as unstable sparking, which requires more specialized tools to diagnose. Safety first—always disconnect the negative terminal of the car battery before working and wear insulated gloves. If you're a beginner and unsure, don't force it—seek professional help.
