What is the typical resistance measurement of a primary ignition coil?

The typical resistance measurement of a primary ignition coil is around 1 ohm, with a tolerance of plus or minus 0.5 ohms. This range is significant as it shows that the resistance can vary slightly but should generally be within this measurement for optimal functionality.

A primary ignition coil typically consists of a winding of wire through which a low voltage current flows, generating a magnetic field before converting that energy into a higher voltage for the spark plugs. If the resistance measurement falls outside this range, it may indicate issues such as short circuits, breaks in the wire, or other failures that could affect the coil's performance.

Understanding that the primary coil's resistance should be approximately 1 ohm helps technicians quickly diagnose potential problems within the ignition system, ensuring that they reach the right conclusion during repairs and maintenance. This foundational knowledge is crucial for anyone involved in smog repair or vehicle diagnostics.