Ignition Coil: Testing and Inspection

NOTE: The ignition coil is designed to operate without an external ballast resistor.

PROCEDURE
1. Inspect the coil for arcing. Test the coil according to coil tester manufacturer's instructions. Arcing at the tower will carbonize the nipple, which if it is connected to a new coil, will cause the coil to fail.

2. Test coil primary and secondary resistance. Replace any coil that does not meet specifications. Refer to the Coil Resistance chart below.

TOYODENSO COIL RESISTANCE

Primary 0.95 - 1.20 ohms

Secondary 11,300 - 13,300 ohms



DIAMOND COIL RESISTANCE

Primary 0.97 - 1.18 ohms

Secondary 11,300 - 15,300 ohms


3. If the ignition coil is being replaced, the secondary sparkplug cable must also be checked. Replace cable if it has been burned or damaged.

4. If a secondary cable shows any signs of damage, the cable should be replaced with a new cable and new terminal. Carbon tracking on the old cable can cause arcing and the failure of a new coil.