How to Check Ignition Coil With a Multimeter
Knowing how to check an ignition coil with a multimeter can help you diagnose problems such as engine misfires, difficult starting, poor acceleration, or an engine that will not start. An ignition coil converts the vehicle’s low-voltage electrical supply into the high voltage needed to create a spark at the spark plug. A multimeter can [...] The post How to Check Ignition Coil With a Multimeter…
To check an ignition coil with a multimeter, start by turning off the engine and locating the coil, which may be directly on the spark plug or connected through high-tension leads. Disconnect the electrical connector and set the multimeter to the resistance setting (Ω). Touch the probes together to ensure the meter is functioning correctly.
Next, test the primary winding by placing the probes across the primary terminals and comparing the reading with the manufacturer's specifications. A high resistance or open circuit may indicate a broken winding. Finally, test the secondary winding by measuring the resistance between the appropriate terminals and comparing it to the manufacturer's specifications.
A coil that fails these tests may be faulty, but it is important to note that a coil can sometimes show normal resistance while failing under heat, load, or high-voltage conditions.
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