What should a technician check if the vehicle has a weak spark?

When diagnosing a weak spark in a vehicle, it is essential to consider multiple factors that could contribute to spark strength. Each of the mentioned elements plays a crucial role in the ignition system's overall performance.

Checking the battery voltage is important because a weak or failing battery can lead to inadequate power being supplied to the ignition coil. If the battery voltage is low, the ignition system may not produce a strong enough spark, leading to starting issues or poor engine performance.

Evaluating the spark plug gap is also necessary because the gap needs to be set correctly for optimal spark generation. If the gap is too wide, the ignition system may struggle to produce a sufficient spark to ignite the air-fuel mixture, resulting in reduced engine performance.

Assessing the ignition coil resistance is critical as well. The ignition coil transforms the battery's low voltage into high voltage necessary for spark generation. If there is an issue with the coil, it may not generate enough voltage, leading to a weak spark.

By checking all these components, a technician can effectively diagnose the cause of weak spark conditions and take the appropriate corrective actions. Therefore, selecting the option that includes all these checks is necessary for a thorough assessment of the ignition system's health.