Ignition Coil Check
IGNITION COIL CHECKCheck by the following procedure, and replace the coil if there is a malfunction.
PRIMARY COIL AND IGNITION POWER TRANSISTOR CONTINUITY CHECK
NOTE:
- An analog-type ohmmeter should be used.
- Connect the negative probe of the ohmmeter to terminal 1.
CAUTION: This test must be performed quickly (in less than 10 seconds) to prevent coil from burning and ignition power transistor from breaking.
1. Connect and disconnect 4.5 - 9.0 V battery between terminal No. 2 and No. 3, and observe the ohmmeter whether there is continuity or not.
2. If results do not agree with the table below, replace the primary coil and ignition power transistor assembly.
SECONDARY COIL CHECK
NOTE: It is impossible to check the secondary coil through the continuity check as a diode is integrated in the secondary coil circuit of this ignition coil. Accordingly, check the secondary coil in the following procedure.
1. Disconnect the ignition coil connector.
2. Remove the ignition coil and install a new spark plug to the ignition coil.
3. Connect the ignition coil connector.
4. Ground the side electrode of the spark plug and crank the engine.
5. Check that spark is produced between the electrodes of the spark plug.
6. If no spark plug is produced, replace the ignition coil with a new one and recheck.
7. If spark is produced with the new ignition coil, replace the old one as it is faulty. If no spark is produced again, the ignition circuit is suspected as faulty. Check the ignition circuit.