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How to Test the Quality of an Ignition Coil?

1 Answers

KatherineRose

07/29/25 4:34pm

Methods for testing an ignition coil are as follows: 1. External Inspection. Visually inspect the ignition coil. If the insulation cover is cracked, the casing is damaged, or it has become damp and lost its ignition capability, it should be replaced. 2. Inspection for Open Circuits, Short Circuits, and Grounding in Primary and Secondary Windings. 1) Resistance Measurement Method. Use a multimeter to measure the resistance of the primary winding, secondary winding, and additional resistor of the ignition coil. The values should meet technical standards; otherwise, it indicates a fault, and the coil should be replaced. 2) Test Lamp Inspection Method. Connect a test lamp to the terminals of the primary winding. If the lamp does not light, it indicates an open circuit. To check for grounding faults, connect one end of the test lamp to the primary winding and the other end to the casing. If the lamp lights, it indicates a grounding fault. Short circuits are harder to detect with a test lamp. 3. Inspection of the Secondary Winding. One end of the secondary winding connects to the high-voltage socket, and the other end connects to the primary winding. During inspection, when one probe of the test lamp touches the high-voltage socket and the other touches the low-voltage terminal, if the lamp lights up brightly, it indicates a short circuit. If the lamp glows dim red, there is no short circuit. If the lamp does not glow at all, observe whether sparks occur when the probe is removed from the terminal. If no sparks occur, it indicates an open circuit in the winding. 4. Spark Intensity Inspection. 1) Electrical Test Bench Inspection. To check the high voltage generated by the ignition coil, it can be tested on a bench along with a distributor. Adjust the discharge electrode gap to 7mm, start at low speed, and once the ignition coil reaches operating temperature (60~70°C), adjust the distributor speed to the specified value. If it can continuously produce blue sparks within 0.5 minutes, the ignition coil is in good condition. 2) Comparative Spark Test Method. This method can be performed either on a test bench or in a vehicle. Compare the spark intensity of the tested ignition coil with that of a known good one. If the ignition coil has internal faults such as short circuits, open circuits, grounding, or if the spark intensity does not meet requirements, it should generally be replaced with a new one.

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