Inspection Procedure 11: Knocking, Abnormal noise


PROBABLE CAUSES



DIAGNOSIS PROCEDURE

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

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

STEP 2. Check idling condition.

Q. Is the check result normal?
Go to Step 3.
Proceed to troubleshooting for improper idling (Refer to Inspection Procedure 7 ).

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

  • Refer to Data List Reference Table (Refer to ).

    1. Item 05: Barometric pressure sensor
    2. Item 06: Manifold absolute pressure sensor
    3. Item 07: Engine coolant temperature sensor
    4. Item 08: No. 2 intake air temperature sensor
    5. Item 09: Accelerator pedal position sensor (main)
    6. Item 10: Accelerator pedal position sensor (sub)
    7. Item 13: Accelerator pedal position sensor (main) learned closed position
    8. Item 16: Exhaust gas recirculation valve position
    9. Item 17: Exhaust gas recirculation valve target position
    10. Item 21: Fuel temperature sensor
    11. Item 43: No. 1 intake air temperature sensor
    12. Item 45: Throttle position sensor
    13. Item 46: Throttle position sensor learned closed position

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 injector identification code.

  • Check injector identification code (Refer to GROUP 00 - Precautions Before Service - Injector Identification Code Registration Procedure ).

Q. Is the check result normal?
Go to Step 5.
Register the injector ID.

STEP 5. Supply pump correction learning.

  • Carry out the supply pump correction learning (Refer to GROUP 00 - Precautions Before Service - Supply Pump Correction Learning ).

Q. Does trouble symptom persist?
Go to Step 6.
The procedure is complete.

STEP 6. Small injection quantity learning.

  • Carry out the small injection quantity learning procedure (Refer to GROUP 00 - Precautions Before Service - Small Injection Quantity Learning Procedure ).

Q. Does trouble symptom persist?
Go to Step 7.
The procedure is complete.

STEP 7. Priming (air bleeding)

  • Bleed air.

Q. Does trouble symptom persist?
Go to Step 8.
The procedure is complete.

STEP 8. Check the waveforms of crank angle sensor and camshaft position sensor.

  • Check the output waveforms on an oscilloscope (Refer to ).

Q. Is the check result normal?
Go to Step 9.
Proceed to the inspection procedure by diagnosis code for the abnormal waveform (Refer to Inspection Chart for Diagnosis Code ).

STEP 9. M.U.T.-III actuator test.

  • Refer to Actuator Test Reference Table (Refer to ).

    1. Item 15: Injector No. 1
    2. Item 16: Injector No. 2
    3. Item 17: Injector No. 3
    4. Item 18: Injector No. 4

Q. Are the check results normal?
Go to Step 10.
Replace the injector at the failed cylinder. After replacing the Injector, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 10. Check compression pressure.

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

Q. Is the check result normal?
Go to Step 11.
Check and repair the engine itself.

STEP 11. Check valve clearance.

  • Check valve clearance (Refer to GROUP 11G - On-vehicle Service - Valve Clearance Check and Adjustment ).

Q. Is the check result normal?
Go to Step 12.
Adjust the valve clearance.

STEP 12. Check injector itself.

  • Check injector itself (Refer to ).

Q. Is the check result normal?
Go to Step 13.
Replace the injector at the failed cylinder. After replacing the Injector, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 13. Check the trouble symptoms.

Q. Does trouble symptom persist?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).