| 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. |
1. | caution | While the scan tool (M.U.T.-IIISE) 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). |
Turn off the power supply mode of the electric motor switch, and then connect the scan tool (M.U.T.-IIISE) to the data link connector (Refer to GROUP 13A - Diagnostic Function 
). 2. Make sure the diagnostic trouble codes are not set using scan tool (M.U.T.-IIISE). 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.
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.-IIISE), 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. Select "Mode $0A" from "Special Function" of Scan tool (M.U.T.-III). Check whether the permanent-DTC (PDTC) is set or not. If set, clear the PDTC. (Refer to GROUP 13A - MFI Diagnosis, Diagnostic Function ). 12. Turn off the power supply mode of the electric motor switch, and then disconnect the scan tool (M.U.T.-IIISE) to the data link connector.
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