ASE Advanced Engine Performance Specialist (L1) Practice Test 2025 – The Complete All-in-One Guide to Achieve Certification Success!

A faulty ignition coil is typically tested using a multimeter to check for resistance readings. This method is effective because each ignition coil has specific resistance values that the manufacturer provides. By measuring the primary and secondary resistance of the ignition coil, a technician can determine whether the coil is functioning within its specified parameters. If the resistance readings are outside the acceptable range, it is an indication that the ignition coil is faulty and may need to be replaced.

While checking the spark plug connections can provide information about the overall ignition system's health, it does not directly test the ignition coil itself. Similarly, examining the ignition wires for wear may reveal issues with the wiring or connections but does not test the coil's operation. Measuring voltage at the battery is important for checking the power supply to the ignition system but does not evaluate the functionality of the ignition coil directly. Therefore, utilizing a multimeter to assess resistance is the most direct and reliable method for testing a faulty ignition coil.