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 ).

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



  • Refer to Data List Reference Table .

  1. Item 5: Barometric pressure sensor
  2. Item 6: Manifold absolute pressure sensor
  3. Item 7: Engine coolant temperature sensor
  4. Item 8: EGR gas temperature sensor
  5. Item 9: Accelerator pedal position sensor (main)
  6. Item 10: Accelerator pedal position sensor (sub)
  7. Item 16: EGR valve position sensor
  8. Item 21: Fuel temperature sensor
  9. Item 43: Intake air temperature sensor
  10. Item 45: Throttle position 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. M.U.T.-III actuator test.



  • Refer to Actuator Test Reference Table .

  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 5.

    Check the injector system of the defective cylinder.

      (Refer to Code No. P0201: No. 1 Injector Circuit Malfunction ).
      (Refer to Code No. P0202: No. 2 Injector Circuit Malfunction ).
      (Refer to Code No. P0203: No. 3 Injector Circuit Malfunction ).
      (Refer to Code No. P0204: No. 4 Injector Circuit Malfunction ).

STEP 5. Check injector itself.



  • Injector connector check.
  • Check injector itself (Refer to ).

Q. Is the check result normal?

Go to Step 6.
Repair or replace the connector, or replace the injector at the failed cylinder.

STEP 6. Check compression pressure.



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

Q. Is the check result normal?

Go to Step 7.
Repair.

STEP 7. Check valve clearance.



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

Q. Is the check result normal?

Go to Step 8.
Adjust the valve clearance.

STEP 8. Check the trouble symptoms.


Q. 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 ).