[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > SYMPTOM PROCEDURES > HESITATION, SAG, POOR ACCELERATION, STUMBLE OR SURGE
Inspection Procedure 8: Hesitation, Sag, Poor Acceleration, Stumble or Surge
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
  • Failure is possibly caused by failed ignition system, or improper air-fuel ratio and compression pressure and so on.
 
 
PROBABLE CAUSES
  • Contamination around the throttle valve
  • Failed intake and exhaust air system
  • Failed air-fuel ratio control system
  • Failed ignition system
  • Failed fuel system
  • Improper compression pressure
  • Use of incorrect or contaminated fuel
  • Failed supercharging pressure control system
  • Failed variable valve timing control system
  • Failed CVT <CVT>
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
note<CVT>
To protect the CVT, the CVT-ECU outputs, into the engine-ECU, the request signal to reduce the engine torque according to the operation condition. Based on the signal, the engine-ECU closes the throttle valve, retards the ignition or carries out fuel cut. At that time, the engine output seems to temporarily reduce, but there is no malfunction.
STEP 1. M.U.T.-IIISE diagnosis code
Is the diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
NO : Go to Step 3 <M/T>.
NO : Go to Step 2 <CVT>.
 
STEP 2. M.U.T.-IIISE other system diagnosis code
noteWhen the CVT has a malfunction, the CVT-ECU might output the request signal of reducing the engine torque in order to protect the CVT.
  • Confirm whether the diagnosis code is set in the CVT-ECU.
Is the diagnosis code set?
Perform troubleshooting of CVT System (Refer to GROUP 23A - Troubleshooting - Diagnosis Code Chart ).
Go to Step 3.
 
STEP 3. Check throttle body (throttle valve portion) contamination.
Is the check result normal?
Go to Step 4.
Clean throttle body (throttle valve portion) (Refer to ).
 
STEP 4. Check idle speed condition.
  • Idle speed check (Refer to GROUP 11A - On-vehicle Service - Idle Speed Check ).
Is the check result normal?
Go to Step 5.
Check Inspection Procedure - unstable idling (rough idling, hunting), improper idling speed (too high or too low), engine stalls during idling (die out) (Refer to ).
 
STEP 5. Check air intake from air flow sensor mounting position and all components downstream of it.
Is the check result normal?
Go to Step 6.
Repair.
 
STEP 6. Check exhaust leak from linear A/F sensor mounting position and all components upstream of it.
Is the check result normal?
Go to Step 7.
Repair.
 
STEP 7. Check injector for operating sound.
  • Check injector for operating sound (Refer to ).
Is operating sound audible?
Go to Step 8.
Check the injector system of the defective cylinder. Check code No. P0261, P0264, P0267, P0270: No. 1, No. 2, No. 3, No. 4 injector circuit low input (Refer to ). Check code No. P0262, P0265, P0268, P0271: No. 1, No. 2, No. 3, No. 4 injector circuit high input (Refer to ).
 
STEP 8. Check purge control solenoid valve itself.
  • Check purge control solenoid valve itself (Refer to GROUP 17 - Emission Control - Evaporative Emission Control System - Purge Control Solenoid Valve Check ).
Is the check result normal?
Go to Step 9.
Replace the purge control solenoid valve.
 
STEP 9. Check evaporative emission control system.
  • Purge control system check (Refer to GROUP 17 - Emission Control - Evaporative Emission Control System - Purge Control System Check ).
  • Purge port vacuum check (Refer to GROUP 17 - Emission Control - Evaporative Emission Control System - Purge Port Vacuum Check ).
Is the check result normal?
Go to Step 10.
Repair.
 
STEP 10. Visual check of ignition spark.
  • Remove the spark plug and install it to the ignition coil.
  • Connect the ignition coil connector.
  • Disconnect all injector connectors.
  • At the engine start, check each spark plug produces a spark.
Is the check result normal?
Go to Step 11.
Check Inspection Procedure - ignition circuit system (Refer to ).
 
STEP 11. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 5: No. 1 intake air temperature sensor
    2. Item 6: Engine coolant temperature sensor
    3. Item 8: Manifold absolute pressure sensor
    4. Item 11: Accelerator pedal position sensor (main)
    5. Item 12: Accelerator pedal position sensor (sub)
    6. Item 13: Throttle position sensor (main)
    7. Item 15: Throttle position sensor (sub)
    8. Item 36: Inlet V.V.T. phase angle
    9. Item 39: Exhaust V.V.T. phase angle
    10. Item 46: Waste gate duty (Motor type)
    11. Item AD: Oxygen sensor (rear)
    12. Item BB: Barometric pressure sensor
    13. Item DE: No. 2 intake air temperature sensor
    14. Item E1: Linear A/F sensor
    15. Item 125: Boost pressure sensor 1
    16. Item 127: Waste gate position sensor
Are the check results normal?
YES : Go to Step 12.
Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value. Inspection chart for diagnosis code (Refer to ).
 
STEP 12. Check compression pressure.
  • Check the compression pressure (Refer to GROUP 11A - On-vehicle Service - Compression Pressure Check ).
Is the check result normal?
Go to Step 13.
Repair.
 
STEP 13. Check fuel.
  • Check for entry of foreign matter (water, diesel fuel, etc.) into fuel.
Is the check result normal?
Go to Step 14.
Replace the fuel.
 
STEP 14. Fuel pressure measurement.
  • Fuel pressure measurement (Refer to ).
Is the check result normal?
Go to Step 15.
Repair.
 
STEP 15. Check supercharging pressure.
  • Supercharging pressure check (Refer to GROUP 15 - On-vehicle Service - Supercharging Pressure Check ).
Is the check result normal?
Go to Step 16.
Repair.
 
STEP 16. Check the trouble symptom.
Does the trouble symptom persist?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).