Ignition Coil Testing “Waste spark ignition sytem”:
1.) Remove the secondary ignition wire , set your DMM on the ohms scale, then insert the probes as shown. Secondary resistance between coil secondary terminal 1 and terminal 2 should be 21.0 K ohms ±15 percent.
2.) Move the DMM leads to coil secondary terminals 3 and 4. Resistance between these terminals should also be 21.0 K ohms ±15 percent.
3.) The next step is to measure the ignition coil primary resistance. Disconnect the ignition coil harness connector. The specified primary resistance between harness connector terminals 1 and 2 is 0.69 ohms ±10 percent.
4.) Move the DMM leads to terminals 2 and 3. Primary resistance between these terminals should also be 0.69 ohms ±10 percent.
5.) A resistance reading of the insulation between any primary terminal and the coil case should be 10M ohms or more. A lower resistance reading indicates that the coil primary windings are shorted to ground.
If your coil pack is defective it’s best to get a new coil pack.
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