Inspection Procedure 10: Hesitation, Sag, Poor Acceleration, Stumble, Surge


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

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

Q. Is 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. Is operating sound audible?
Go to Step 3.
Check the injector system of the defective cylinder. Check code No. P0261: No. 1 injector circuit low input (Refer to ). Check code No. P0262: No. 1 injector circuit high input (Refer to ). Check code No. P0264: No. 2 injector circuit low input (Refer to ). Check code No. P0265: No. 2 injector circuit high input (Refer to ). Check code No. P0267: No. 3 injector circuit low input (Refer to ). Check code No. P0268: No. 3 injector circuit high input (Refer to ). Check code No. P0270: No. 4 injector circuit low input (Refer to ). Check code No. P0271: No. 4 injector circuit high input (Refer to ).Check code No. P0273: No. 5 injector circuit low input (Refer to ). Check code No. P0274: No. 5 injector circuit high input (Refer to ).Check code No. P0276: No. 6 injector circuit low input (Refer to ). Check code No. P0277: No. 6 injector circuit high input (Refer to ).

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

  • Refer to Data List Reference Table .

    1. Item 5: Intake air temperature sensor
    2. Item 6: Engine coolant temperature sensor
    3. Item 11: Accelerator pedal position sensor (main)
    4. Item 12: Accelerator pedal position sensor (sub)
    5. Item 13: Throttle position sensor (main)
    6. Item 15: Throttle position sensor (sub)
    7. Item BB: Barometric pressure sensor

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 <MPI> - Evaporative Emission Control System - Purge Control Solenoid Valve Check ).

Q. Is the check result normal?
YES : 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 AC: Right bank oxygen sensor (front)
    2. Item AD: Right bank oxygen sensor (rear)
    3. Item AE: Left bank oxygen sensor (front)
    4. Item AF: Left bank oxygen sensor (rear)

Q. Are the check results 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 it to the ignition coil.
  • Connect the ignition coil connector.
  • Remove all injector connectors.
  • At the engine start, check each spark plug produces a spark.

Q. Is the check result normal?
Go to Step 7.
Check Inspection Procedure - Ignition circuit system (Refer to ).

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

Q. Is the check result normal?
Go to Step 8.
Clean throttle body (throttle valve portion) (Refer to ).

STEP 8. Check compression pressure.

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

Q. Is the check result normal?
Go to Step 9.
Repair.

STEP 9. Fuel pressure measurement.

  • Fuel pressure measurement (Refer to ).

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

STEP 10. Check air intake from intake hose and inlet manifold.

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

STEP 11. Check exhaust leak from exhaust from exhaust manifold.

Q. Is the check result normal?
Replace the engine-ECU.
Repair.