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1.Turn the ignition switch to the "LOCK" (OFF) position and then connect the M.U.T.-III
to the diagnosis connector (Refer to GROUP 00 -
Precautions Before Service -
M.U.T.-III
Sub Assembly  ).
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2.Make sure the diagnosis codes are not set using M.U.T.-III. 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.
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3.Disconnect the injector connectors on all of the cylinders.
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4.Disconnect the ignition coil connector.
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5.Remove the ignition coil and install a good spark plug to the ignition coil.
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6.Connect the ignition coil connector.
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7.Earth the side electrode of the spark plug and crank the engine.
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8.Check that spark is produced between the electrodes of the spark plug.
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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.
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10.Using M.U.T.-III, make sure whether the diagnosis 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.
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11.Turn the ignition switch to the "LOCK" (OFF) position, and then disconnect the M.U.T.-III.
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