What key component may signal if an ignition coil issue is present?

The pulsar unit is key in signaling potential issues with the ignition coil because it is responsible for generating a timing signal for the engine management system. This signal is crucial for determining when to fire the ignition coil, which ignites the air-fuel mixture in the combustion chamber. If there is a malfunction in the pulsar unit, it can lead to incorrect timing or failure to trigger the ignition coil, resulting in poor engine performance or misfires. Therefore, monitoring the pulsar unit can help diagnose ignition coil issues effectively, as it directly influences how the ignition system operates.