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Home >> Nissan-Datsun >> 2004 >> Altima Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System - 2.5L >> DTC P1274: A/F Sensor 1 >> DTC Confirmation Procedure >> With GST
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With GST

  1. Start engine and warm it up to normal operating temperature.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Disconnect mass air flow sensor harness connector.
  4. Start engine and let it idle for at least 5 seconds.
  5. Stop engine and reconnect mass air flow sensor harness connector.
  6. Select "MODE 3" with GST and make sure that DTC P0102 is detected.
  7. Select "MODE 4" with GST and erase the DTC P0102.
  8. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for 1 minute under no load.
  9. Let engine idle for 1 minute.
    Fig 1: Identifying Mass Air Flow Sensor & Air Cleaner
    G02884739Courtesy of NISSAN MOTOR CO., U.S.A.
  10. Keep engine speed between 2, 500 and 3, 000 RPM for 20 minutes.
  11. Select "MODE 7" with GST.

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

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