Ignition Coil: Testing and Inspection

IGNITION COIL
When the ignition power transistor is turned ON by the signal from the ECM, It sends the signal to the ignition coil, then primary current is shut off and a high voltage is induced in the secondary coil.




CIRCUIT DIAGRAM







HARNESS INSPECTION




1. Measurement of the primary coil resistance. Measure the resistance between connector terminals 3 and 1 (the coils at the No.1 and No.4 cylinder sides) of the ignition coil, and between terminals 3 and 2 (the coils at the No.2 and No.3 cylinder sides).
Standard value: 0.5 ± 0.05 K Ohms




2. Measurement of the secondary coil resistance. Measure the resistance between the high-voltage terminal for the No.1 and No.4 cylinders, and between the high-voltage terminals for the No.2 and No.3 cylinders.
Standard value: 12.1 ± 1.8 K Ohms


CAUTION: Be sure, when measuring the resistance of the secondary coil, to disconnect the connector of the ignition coil.