Inspection Procedure 6: Starting Impossible (Initial Combustion But No Complete Combustion), Improper Starting (Long Time to Start)

COMMENT ON TROUBLE SYMPTOM

Failure is possibly caused by poor ignition, incorrect air-fuel ratio at cranking, improper fuel pressure and so on.

PROBABLE CAUSE

Failed battery
Failed ignition system
Failed fuel system
Failed air-fuel ratio control system
Failed intake air system
Failed exhaust gas cleaning system
Contamination of throttle body (throttle valve portion)
Timing belt in out of place
Improper compression pressure
Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check battery condition.

Q. Have the battery terminal been disconnected?

	After warm-up engine, idle for about 10 minutes.

	Go to Step 2 .

STEP 2. Check battery voltage.

Measure battery voltage at cranking.

OK: 8 V or more

Q. Is the check result normal?

	Go to Step 3 .

	Check battery (Refer to GROUP 54 - Battery - On-vehicle Service - Battery Test ).

STEP 3. M.U.T.-III diagnosis code

Q. Is diagnosis code set?

	Inspection chart for diagnosis codes (Refer to ).

	Go to Step 4 .

STEP 4. M.U.T.-III data list

Refer to Data List Reference Table .

Item 12: Air flow sensor
Item 13: Intake air temperature sensor
Item 21: Engine coolant temperature sensor

Q. Are the check results normal?

	Go to Step 5 .

	Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

STEP 5. M.U.T.-III data list

Refer to Data List Reference Table .

Item 25: Barometric pressure sensor

Q. Is the check result normal?

	Go to Step 6 .

	Replace engine-A/T-ECU.

STEP 6. Check throttle body (throttle valve portion) contamination.

Q. Is the check result normal?

	Go to Step 7 .

	Clean throttle body (throttle valve portion) (Refer to ).

STEP 7. M.U.T.-III actuator test

Item 07: Fuel pump

OK: Operating sound of fuel pump can be heard.

Q. Is the check result normal?

	Go to Step 8 .

	Check fuel pump system (Refer to Inspection Procedure 23 ).

STEP 8. Check air intake from intake hose and inlet manifold.

Q. Is the check result normal?

	Go to Step 9 .

	Repair.

STEP 9. Check injector for operating sound.

Check injector for operating sound at engine cranking (Refer to ).

Q. Can operating sound be heard?

	Go to Step 10 .

	Check the injector system of the defective cylinder. (Refer to Code No. P0201: No.1 Injector System .) (Refer to Code No. P0202: No.2 Injector System .) (Refer to Code No. P0203: No.3 Injector System .) (Refer to Code No. P0204: No.4 Injector System .)

STEP 10. Check timing marks of timing belt.

Q. Is the check result normal?

	Go to Step 11 .

	Align timing marks.

STEP 11. Check spark plug.

Q. Is the check result normal?

	Go to Step 12 .

	Replace spark plug.

STEP 12. Check ignition coil spark.

Q. Is the check result normal?

	Go to Step 13 .

	Check ignition circuit system (Refer to Inspection Procedure 26 ).

STEP 13. Check spray condition of injector.

Check each injector for spray condition (Refer to ).

Q. Is the check result normal?

	Go to Step 14 .

	Replace injector.

STEP 14. Check compression pressure.

Check compression pressure (Refer to GROUP 11A - On-vehicle Service - Compression Pressure Check ).

Q. Is the check result normal?

	Go to Step 15 .

	Repair.

STEP 15. Fuel pressure measurement.

Fuel pressure measurement (Refer to Fuel Pressure Test ).

Q. Is the check result normal?

	Go to Step 16 .

	Repair.

STEP 16. Check EGR valve (stepper motor) itself.

Check EGR valve (stepper motor) itself [Refer to GROUP 17 - Emission Control System - Exhaust Gas Recirculation (EGR) System - EGR Valve (stepper motor) Check ].

Q. Is the check result normal?

	Go to Step 17 .

	Replace EGR valve (stepper motor).

STEP 17. Replace engine-A/T-ECU.

After replacing the engine-A/T-ECU, re-check the trouble symptom.

Q. Does the trouble symptom persist?

	Check for foreign matters (water, kerosene, etc.) in fuel and replace if necessary.

	Check end.