Ignition System Check

DIAGNOSTIC PROCEDURES

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	Ignition spark test 1 Perform IGNITION SPARK TEST . Is test result satisfactory?	Go to Step 3.	Go to Step 4.
3	Ignition timing check Check ignition timing, see Ignition Timing Inspection . Is check result satisfactory?	Ignition system is in good condition.	Repair or replace malfunctioning part.
4	Confirmation of cylinders with malfunction detected Confirm whether there are any cylinders with a malfunction detected in ignition spark test. Are there malfunctions in any cylinders?	Go to Step 8.	Go to Step 5.
5	Ignition spark test 2 Replace spark plug in cylinder with malfunction detected with spark plug of normal cylinder. Perform IGNITION SPARK TEST on spark plug newly installed in cylinder with malfunction detected. Is test result satisfactory?	Replace spark plug in malfunction-detected cylinder, see Spark Plug Removal and Installation .	Go to Step 6.
6	Ignition spark test 3 Replace ignition coil assembly in cylinder with malfunction detected with ignition coil assembly of normal cylinder. Perform IGNITION SPARK TEST on spark plug in cylinder with malfunction detected. Is test result satisfactory?	Replace ignition coil assembly in cylinder with malfunction detected.	Go to Step 7.
7	Ignition coil assembly drive circuit check Check drive circuits (B1, B2, B3 and B4) of each ignition coil assembly for open, short and poor connection. Are circuits in good condition?	Go to Step 8.	Repair malfunctioning part.
8	Ignition coil assembly power supply and ground circuit check Check power supply (A1, A2, A3 and A4) and ground (C1, C2, C3 and C4) circuits of each ignition coil assembly for open, short and poor connection. Are circuits in good condition?	Replace ECM and recheck DTC, see ECM REMOVAL AND INSTALLATION .	Repair malfunctioning part.