Inspection Procedure 11: Hesitation, Sag, Poor Acceleration, Stumble, Surge


COMMENT ON TROUBLE SYMPTOM



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2 .

STEP 2. Check injector for operating sound.

  • Check injector for operating sound (Refer to ).

Q. Can operating sound be heard?
Go to Step 3 .

    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 3. M.U.T.-III data list

  • Refer to Data List Reference Table .

    1. Item No. 6: Intake air temperature sensor
    2. Item No. 8: Engine coolant temperature sensor
    3. Item No. 11: Accelerator pedal position sensor (main)
    4. Item No. 12: Accelerator pedal position sensor (sub)
    5. Item No. 13: Throttle position sensor (main)
    6. Item No. 14: Throttle position sensor (sub)

Q. Are the check results normal?
Go to Step 4 .
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 4. Check purge control solenoid valve itself.

  • Check purge control solenoid valve itself (Refer to GROUP 17 - Emission Control System - Evaporative Emission Control System- Purge Control Solenoid Valve Check ).

Q. Is the check result normal?

Go to Step 5 .
Replace the purge control solenoid valve.

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

  • Refer to Data List Reference Table .

    1. Item No. 9: Oxygen sensor (front)
    2. Item No. 10: Oxygen sensor (rear)

Q. Is the check result normal?

Go to Step 6 .
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 6. Visual check of ignition spark.

  • Remove the spark plug and install to the ignition coil.
  • Connect the ignition coil connector.
  • Remove all injector connectors.
  • At the engine start, check each spark plug procedure a spark.

Q. Is the check result normal?

Go to Step 7 .
Check ignition circuit system (Refer to Inspection Procedure 24 ).

STEP 7. Check throttle body (throttle valve portion) for contamination.

Q. Is the check result normal?

Go to Step 8 .
Clean throttle body (throttle valve portion) (Refer to ).

STEP 8. M.U.T.-III actuator test

  • Item No. 12: Waste gate solenoid valve
OK: Operating sound is audible on actuation.

Q. Is the check result normal?
Go to Step 9 .
Check waste gate solenoid valve system (Refer to Code No. P0243 ).

STEP 9. Check turbocharger supercharging pressure.

  • Check turbocharger output pressure (Refer to GROUP 15 -Intake Exhaust -On-vehicle Service ).

Q. Is the check result normal?
Go to Step 10 .
Repair.

STEP 10. Check supercharging pressure control system.

  • Check supercharging pressure control system (Refer to GROUP 15 -Intake Exhaust -On-vehicle Service ).

Q. Is the check result normal?
Go to Step 11 .
Repair.

STEP 11. M.U.T.-III actuator test

  • Item No. 11: Fuel pressure control solenoid valve
OK: Operating sound is audible on actuation.

Q. Is the check result normal?
Go to Step 12 .
Check fuel pressure control solenoid valve system (Refer to Code No. P0443 ).

STEP 12. Fuel pressure measurement.

  • Measure fuel pressure (Refer to ).

Q. Is the check result normal?

Go to Step 13 .
Repair the fuel pressure.

STEP 13. Check compression pressure.

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

Q. Is the check result normal?

Replace the engine-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).
Repair the compression pressure.