Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Ignition Coil: Testing and Inspection





1. Pull out high-tension cord by gripping its cap.
2. Disconnect ignition coil coupler.
3. Measure primary and secondary coil resistances.

Ignition coil resistance (at 20°C, 68°F)
Primary :0.86 - 1.06 Ohms
Secondary: 11.2 - 15.2 k Ohms

4. If resistance is out of specification, replace coil with new one.