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Home >> Infiniti >> 2004 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P0420 & DTC P0430: Three Way Catalyst Function >> DTC Confirmation Procedure >> Testing Condition:
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Testing Condition:

  1. Start engine and warm it up to the normal operating temperature.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
  4. Let engine idle for 1 minute.
  5. Open engine hood.
  6. Select DTC & SRT CONFIRMATION then SRT WORK SUPPORT mode with CONSULT-II.
  7. Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecutive minutes then release the accelerator pedal completely. If INCMP of CATALYST changed to COMPLT, go to step  10 .
    Fig 1: Display CONSULT-II SRT WORK SUPPORT Confirmation Procedure
    G00786803Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Wait 5 seconds at idle.
  9. Rev engine up to 2,000 to 3,000 rpm and maintain it until INCMP of CATALYST changes to CMPLT (It will take approximately 5 minutes). If not CMPLT, perform the following.
    Fig 2: Display CONSULT-II SRT WORK SUPPORT Confirmation Procedure
    G00786804Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
    2. Turn ignition switch ON and select COOLANTEMP/S in DATA MONITOR mode with CONSULT-II.
      Fig 3: Display CONSULT-II SELF DIAG RESULTS Confirmation Procedure
      G00786805Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Start engine and warm it up while monitoring COOLANTEMP/S indication on CONSULT-II.
    4. When COOLANTEMP/S indication reaches to 70° C (158° F) go to step 3.
  10. Select SELF-DIAG RESULTS mode with CONSULT-II.
  11. Confirm that the 1st trip DTC is not detected.

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