[ 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 > UNSTABLE IDLING (ROUGH IDLING, HUNTING), IMPROPER IDLING SPEED (TOO HIGH OR TOO LOW), ENGINE STALLS DURING IDLING (DIE OUT)
Inspection Procedure 5: Unstable Idling (rough idling, hunting), Improper Idling Speed (too high or too low), Engine Stalls during Idling (die out)
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
  • Probable causes can be widely found in the ignition system, air-fuel ratio control system, electronic-controlled throttle valve system, fuel system and so on. A sudden engine stall is possibly caused by poor contact in the connectors.
 
 
PROBABLE CAUSES
  • Failed ignition system
  • Failed fuel system
  • Failed air-fuel ratio control system
  • Failed intake air system
  • Contamination around the throttle valve
  • Timing chain in out of place
  • Improper compression pressure
  • Failed variable valve timing control system
  • Failed engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE diagnosis code
Is the diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2.
 
STEP 2. 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 10: Air flow sensor
    5. Item 11: Accelerator pedal position sensor (main)
    6. Item 12: Accelerator pedal position sensor (sub)
    7. Item 13: Throttle position sensor (main)
    8. Item 15: Throttle position sensor (sub)
    9. Item 36: Inlet V.V.T. phase angle
    10. Item 39: Exhaust V.V.T. phase angle
    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
Are the check results normal?
YES : Go to Step 4 <M/T>.
YES : Go to Step 3 <CVT>.
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 3. M.U.T.-IIISE data list
  • Data list reference table (Refer to ).
    1. Item 87: Neutral position switch
Is the check result normal?
Go to Step 4.
Carry out checks relating to the system.
 
STEP 4. Check air intake from intake hose and inlet manifold.
Is the check result normal?
Go to Step 5.
Repair.
 
STEP 5. Check timing mark on the timing chain.
Is the check result normal?
Go to Step 6.
Align the timing marks.
 
STEP 6. Check throttle body (throttle valve portion) contamination.
Is the check result normal?
Go to Step 7.
Clean throttle body (throttle valve portion) (Refer to ).
 
STEP 7. 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 8.
Check Inspection Procedure - ignition circuit system (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 injector for spray condition.
  • Check each injector for spray condition (Refer to ).
Is the check result normal?
Go to Step 10.
Replace the injector.
 
STEP 10. 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 11.
Repair.
 
STEP 11. Check for foreign matters (water, kerosene, etc.) in fuel.
Is the check result normal?
Go to Step 12.
Fuel replacement
 
STEP 12. Check the trouble symptom.
Does the trouble symptom persist?
Replace the engine-ECU.
Check end.