Diagnosis Procedure

Visually check exhaust tubes and muffler for dents.

Is the inspection result normal?

YES

GO TO 2.

NO

Repair or replace.

1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 1.

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Is exhaust gas leak detected?

YES

Repair or replace.

NO

GO TO 3.

Listen for an intake air leak after the mass air flow sensor.

Is intake air leak detected?

YES

Repair or replace.

NO

GO TO 4.

For procedure, refer to Work Procedure .

For specification, refer to Idle Speed and Ignition Timing .

Is the inspection result normal?

YES

GO TO 5.

NO

Follow the Work Procedure .

Check the fuel injector. Refer to Component Function Check .

Is the inspection result normal?

YES

GO TO 6.

NO

Perform Diagnosis Procedure .

1. Turn ignition switch OFF.
2. Pull out 15A fuse (No. 47) from IPDM E/R to release fuel pressure. Refer to IPDM E/R Terminal Arrangement .
   NOTE: Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following procedure.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 - 0.66 in) between the edge of the spark plug and grounded metal portion as shown below.

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11. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

    Spark should be generated.

    CAUTION:

    • Never place the spark plug and the ignition coil within 50 cm (19.7 in) each other. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
    • It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
    NOTE: When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunctioning.

Is the inspection result normal?

YES

GO TO 10.

NO

GO TO 7.

1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a non-malfunctioning spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.

   Spark should be generated.

Is the inspection result normal?

YES

GO TO 8.

NO

Check ignition coil, power transistor and their circuits. Refer to Diagnosis Procedure .

Check the initial spark plug for fouling, etc.

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Is the inspection result normal?

YES

Replace spark plug(s) with standard type one(s). For spark plug type, refer to SPARK PLUG .

NO

Repair or clean spark plug. Then GO TO 9.

1. Reconnect the initial spark plugs.
2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion.

   Spark should be generated.

Is the inspection result normal?

YES

INSPECTION END

NO

Replace spark plug(s) with standard type one(s). For spark plug type, refer to SPARK PLUG .

1. Replace three way catalyst of malfunctioning bank side. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .
2. Perform DTC confirmation procedure. Refer to DTC Description .

Is DTC P0420 or P0430 detected?

YES

Replace all fuel injector of malfunctioning bank side. Refer to Removal and Installation .

NO

INSPECTION END