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Home >> Nissan-Datsun >> 2005 >> Sentra Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System (QG18DE) >> DTC P0420: Three Way Catalyst Function >> Diagnostic Trouble Codes Confirmation Procedure
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Diagnostic Trouble Codes Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 

TESTING CONDITION: 

Do not hold engine speed for more than the specified minutes below. 

  1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
    Fig 1: CONSULT-II Display - DATA MONITOR Mode
    G02449960Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Start engine and warm it up to normal operating temperature.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
  5. Let engine idle for 1 minute.
  6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F).
  7. Open engine hood.
  8. Select "DTC & SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT-II.
    Fig 2: CONSULT-II Display - SRT WORK SUPPORT, SRT WORK SUPPORT
    G02449961Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Rev engine up to 2, 500 to 3, 500 rpm and hold it for 3 consecutive minutes, then release the accelerator pedal completely.

    If "INCMP" of "CATALYST" changed to "CMPLT", GO TO STEP 12.

  10. Wait 5 seconds at idle.
  11. Rev engine up to 2, 000 to 3, 000 rpm and maintain it until "IMCMP" of "CATALYST" changes to "CMPLT" (it will take approximately 5 minutes).

    If not "CMPLT", stop engine and cool it down to less than 70°C (158°F) and then retest step 1.

    Fig 3: CONSULT-II Display - SRT WORK SUPPORT, SRT WORK SUPPORT
    G02449962Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Select "SELF-DIAG RESULTS" mode with CONSULT-II.
    Fig 4: CONSULT-II Display - SELF-DIAG RESULTS
    G02449963Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Confirm that the 1st trip DTC is not detected.

    If the 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE ".