IGNITION COIL CHECK

note	It is impossible to carry out an easy check using a circuit tester because a diode and so on are integrated into the inside circuit of this ignition coil. Accordingly, check the ignition coil in the following procedure.

caution

While the scan tool (M.U.T.-III SE) is communicating with the vehicle, the electric motor switch may not be turned off and no normally. Therefore, when you turn off the electric motor switch for that communication, wait for several seconds and then turn on it again (do not turn on it immediately).

1. Turn the power supply mode of the electric motor switch to OFF and then connect the scan tool (M.U.T.-III SE) to the data link connector (MULTI USE TESTER (M.U.T.-III) SUB ASSEMBLY

2. Make sure the diagnostic trouble codes are not set using scan tool (M.U.T.-III SE). If set, record the code No. Carry out the troubleshooting for the set codes and solve the problems even if not related to the ignition.

3. Disconnect the injector connectors on all of the cylinders.

4. Disconnect the ignition coil connector.

5. Remove the ignition coil and install a good spark plug to the ignition coil.

6. Connect the ignition coil connector.

7. Ground the side electrode of the spark plug and set the vehicle to the continuous idling mode (Refer to CONTINUOUS IDLING MODE

8. Check that spark is produced between the electrodes of the spark plug.

9. If the spark plug has weak sparks or no sparks, carry out the same check using a good ignition coil. If there are strong sparks on this check with a good ignition coil, it becomes clear there is a problem with the ignition coil. Replace the ignition coil with a new one. If there are no sparks on this check with a good ignition coil, there is probably a problem with the ignition circuit. Check the ignition circuit.

10. Using scan tool (M.U.T.-III SE), make sure whether the diagnostic trouble codes are set due to the check, or not. Except the codes set in Step 2, clear the codes all together if they are present. And then, carry out the troubleshooting about the codes recorded.

11. Turn the power supply mode of the electric motor switch to OFF and then disconnect the scan tool (M.U.T.-III SE).