Diagnostic Test

1. Stop engine and check the following for connection.
   • Air duct
   • Vacuum hoses
   • PCV hose
   • Intake air passage between air duct to intake manifold
2. Start engine and let it idle.
3. Listen for an intake air leak after the mass air flow sensor.

Is the inspection result normal?

YES 

GO TO STEP 2  .

NO 

Repair or replace error-detected parts.

1. Stop engine and visually check exhaust tube, three way catalyst and muffler for dents connection.
2. Start engine and let it idle.
3. Listen for an exhaust gas leak before three way catalyst (manifold).

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Is the inspection result normal?

YES 

GO TO STEP 3  .

NO 

Repair or replace error-detected parts.

1. Release fuel pressure to zero. Refer to WORK PROCEDURE .
2. Check fuel pressure. Refer to WORK PROCEDURE .

Is the inspection result normal?

YES 

GO TO STEP 4  .

NO 

GO TO STEP   9  .

With CONSULT

Check "MASS AIR FLOW" in "DATA MONITOR" mode of "ENGINE" using CONSULT.

For specification, refer to MASS AIR FLOW SENSOR .

With GST

Check mass air flow sensor signal in Service $01 using GST.

For specification, refer to MASS AIR FLOW SENSOR .

Is the inspection result normal?

YES 

GO TO STEP 5  .

NO 

Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to DIAGNOSIS PROCEDURE .

With CONSULT 

1. Start engine.
2. Perform "POWER BALANCE" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
3. Check that each circuit produces a momentary engine speed drop.

Without CONSULT 

1. Let engine idle.
2. Listen to each fuel injector operating sound.

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   Clicking noise should be heard.

Is the inspection result normal?

YES 

GO TO STEP 6  .

NO 

Perform trouble diagnosis for fuel injector, refer to COMPONENT INSPECTION .

1. Turn ignition switch OFF.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect all fuel injector harness connectors.
4. Remove fuel tube assembly. Refer to REMOVAL AND INSTALLATION .

   Keep fuel hose and all fuel injectors connected to fuel tube.

5. Disconnect all ignition coil harness connectors.
6. Prepare pans or saucers under each fuel injector.
7. Crank engine for approximately 3 seconds.

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   Fuel should be sprayed evenly for each fuel injector. Fuel must not drip from the tip of fuel injector.

Is the inspection result normal?

YES 

GO TO STEP 7  .

NO 

Replace fuel injector. Refer to REMOVAL AND INSTALLATION .

1. Turn ignition switch OFF.
2. Remove fuel pump fuse from IPDM E/R to release fuel pressure.
   NOTE:

   CONSULT must not be used to release fuel pressure. It develops again during the following steps, if released by using CONSULT. 

3. Start the engine.
4. After an engine stall, crank the engine two or three times to release all the fuel pressure.
5. Turn ignition switch OFF.
6. Disconnect all the harness connectors of ignition coil to prevent electric discharge from occurring in ignition coil.
7. Remove ignition coil assembly and spark plug of cylinder. Refer to REMOVAL AND INSTALLATION LH , REMOVAL AND INSTALLATION RH .
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. Allow a 13-17mm (0.52-0.66 in) spacing between spark plug and grounded metal portion as shown in illustration to fix the ignition coil with a rope or an equivalent.

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11. Crank the engine for approximately 3 seconds to see if sparking occurs between spark plug and the grounded metal portion.

    Spark should be generated.

    CAUTION:

    • The discharge voltage becomes 20 kV or higher. Therefore, always stay away from the spark plug and ignition coil at least 50 cm (19.7 in) during the inspection.
    • Leaving a space of more than 17mm (0.66 in) may damage the ignition coil.
    NOTE:

    When the gap is less than 13 mm (0.52 in), a the spark might be generated even if the coil is malfunctioning. 

Is the inspection result normal?

YES 

GO TO STEP 8  .

NO 

GO TO STEP 10  .

Check compression pressure. Refer to WORK PROCEDURE .

Is the inspection result normal?

YES 

Check intermittent incident. Refer to INTERMITTENT INCIDENT .

NO 

Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

Check fuel hoses and fuel tubes for clogging.

Is the inspection result normal?

YES 

Replace fuel filter and fuel pump assembly. Refer to REMOVAL AND INSTALLATION .

NO 

Repair or replace error-detected parts.

1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a non-malfunctioning spark plug.
3. Crank engine for approximately 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 STEP 11  .

NO 

Check ignition coil, power transistor and their circuits. Refer to COMPONENT FUNCTION CHECK .

Check the initial spark plug for fouling, etc.

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Is the inspection result normal?

YES 

1. Repair or clean spark plug. Refer to REMOVAL AND INSTALLATION .
2. GO TO STEP 12  .

NO 

Replace spark plug(s) with standard type one(s). For spark plug type, refer to REMOVAL AND INSTALLATION .

1. Reconnect the initial spark plugs.
2. Crank engine for approximately 3 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 

Check intermittent incident. Refer to INTERMITTENT INCIDENT .

NO 

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