Ignition Coil Test

COIL TEST

To perform a complete test of the ignition coil and its circuitry, refer to the DRB scan tool. Also refer to the appropriate Powertrain Diagnostics Procedures. To test the coil only, refer to the following:

Fig. 12 Ignition Coil:

The ignition coil (Fig. 12) is designed to operate without an external ballast resistor.

Inspect the ignition coil for arcing. Test the coil according to coil tester manufacturer's instructions. Test the coil primary and secondary resistance.

Fig. 13 Ignition Coil Resistance:

Replace any coil that does not meet specifications. Refer to the Ignition Coil Resistance chart (Fig. 13).

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

Arcing at the tower will carbonize the cable boot, which if it is connected to a new ignition coil, will cause the coil to fail.