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Home › Nissan-Datsun › 2004 › Maxima SL, RE4F04B › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTC › DTC P1279, P1289: A/F Sensor › Diagnostic Procedure › 5. Clear The Self-Learning Data › Without CONSULT-II

Without CONSULT-II

  1. Start engine and warm it up to normal operating temperature.
  2. Turn ignition switch OFF.
  3. Disconnect mass air flow sensor harness connector.
  4. Restart engine and let it idle for at least 3 seconds.
  5. Stop engine and reconnect mass air flow sensor harness connector.
  6. Make sure DTC P0102 is displayed.
  7. Erase the DTC memory. Refer to , "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFO ".
  8. Make sure DTC P0000 is displayed.
  9. Run engine for at least 10 minutes at idle speed.

    Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? 

    Is it difficult to start engine? 

Fig 1: Disconnect Mass Air Flow Sensor Harness Connector
G00877575Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No 

  1. Yes: Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to "DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION " or "DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION ".
  2. No: GO TO 6.
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