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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1507 (Engine Control System) >> DTC P1278, P1288: A/F Sensor 1 >> Diagnostic Trouble Codes Confirmation Procedure >> With Consult-II

With Consult-II

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and warm it up to 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. Select "A/F SEN1(B1) P1278/P1279" or "A/F SEN1(B1) P1288/P1289" of "A/F SEN1" in "DTC WORK SUPPORT" mode with CONSULT-II.
    Fig 1: CONSULT-II A/F SEN1 B1 P1278/P1279 Display
    G02474450Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Touch "START".

    If "COMPLETED" appears on CONSULT-II screen, go to step 10.

    If "COMPLETED" does not appear on CONSULT-II screen, go to the following step.

  7. After perform the following procedure, "TESTING" will be displayed on the CONSULT-II screen.
    Fig 2: CONSULT-II A/F SEN1 B1 P1278/P1279 Display
    G02474451Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Increase the engine speed up to 4, 000 to 5, 000 RPM and keep it for 10 seconds.
  9. Fully release accelerator pedal and then let engine idle for about 10 seconds.

    If "TESTING" is not displayed after 10 seconds, refer to " TROUBLE DIAGNOSIS - SPECIFICATION VALUE  "  .

  10. Wait for about 20 seconds at idle at under the condition that "TESTING" is displayed on the CONSULT-II screen.
  11. Make sure that "TESTING" changes to "COMPLETED".

    If "TESTING" changed to "OUT OF CONDITION", refer to " TROUBLE DIAGNOSIS - SPECIFICATION VALUE  "  .

    Fig 3: CONSULT-II A/F SEN1 B1 P1278/P1279 Display
    G02474452Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Make sure that "OK" is displayed after touching "SELF-DIAG RESULT".

    If "NG" is displayed, go to "DIAGNOSTIC PROCEDURE ".