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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1110 (Engine Control System) >> DTC P1278, P1288: A/F Sensor 1 >> DTC Confirmation Procedure >> Testing Condition:
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Testing Condition:

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

Before performing the following procedure, confirm that battery voltage is more than 11V at idle. 

With CONSULT-II 

  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.
  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.

    Fig 1: Displaying OUT OF CONDITION Mode
    G00782879Courtesy of NISSAN MOTOR CO., U.S.A.
  7. After perform the following procedure, "TESTING" will be displayed on the CONSULT-II screen.
    1. Increase the engine speed up to 4, 000 to 5, 000 RPM and keep it for 10 seconds.
    2. 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 ".

  8. Wait for about 20 seconds at idle at under the condition that "TESTING" is displayed on the CONSULT-II screen.
    Fig 2: Displaying "TESTING" Mode
    G00782880Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Make sure that "TESTING" changes to "COMPLETED".

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

  10. Make sure that "OK" is displayed after touching "SELF-DIAG RESULT".

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

    Fig 3: Displaying "COMPLETED" Mode
    G00782881Courtesy of NISSAN MOTOR CO., U.S.A.

With GST 

  1. Start engine and warm it up to normal operating temperature.
  2. Select "MODE 1" with GST.
  3. Calculate the total value of "Short term fuel trim" and "Long term fuel trim" indications.

    Make sure that the total percentage should be within +/-15%.

    If OK, go to the following step.

    If NG, check the following.

    • Intake air leaks
    • Exhaust gas leaks
    • Incorrect fuel pressure
    • Lack of fuel
    • Injectors
    • Incorrect PCV hose connection
    • PCV valve
    • Mass air flow sensor
  4. Turn ignition switch OFF and wait at least 10 seconds.
  5. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
  6. Let engine idle for 1 minute.
  7. Increase the engine speed up to 4, 000 to 5, 000 RPM and keep it for 10 seconds.
  8. Fully release accelerator pedal and then let engine idle for about 1 minute.
  9. Repeat steps from 4 to 8.
  10. Select "MODE 3" with GST and make sure that no DTC is displayed.

    If the DTC is displayed, go to "DIAGNOSTIC PROCEDURE ".

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