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Home >> Nissan-Datsun >> 2004 >> Altima Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control System - 2.5L >> DTC P1271: A/F Sensor 1 >> DTC Confirmation Procedure >> With Consult-II
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With Consult-II

  1. Start engine and warm it up to normal operating temperature.
  2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode with CONSULT-II.
  3. Check "A/F SEN1 (B1)" indication.

    If the indication is constantly approx. 0V, go to "DIAGNOSTIC PROCEDURE ".

    If the indication is not constantly approx. 0V, go to next step.

  4. Turn ignition switch OFF, wait at least 10 seconds and then restart engine.
  5. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.
  6. Maintain the following conditions for about 20 consecutive seconds.
    ENGINE SPEED, VEHICLE SPEED AND COOLANT TEMPERATURE SPECIFICATION

    ENG SPEED 1, 000 - 3, 200 RPM
    VHCL SPEED SE More than 40 km/h (25 MPH)
    B/FUELSCHDL 1.5 - 9.0 msec
    COOLANT TEMP/S Less than 70°C(158°F)
    Gear position Suitable position
    Fig 1: Display CONSULT II (Data Monitor)
    G02884705Courtesy of NISSAN MOTOR CO., U.S.A.
    NOTE:
    • Keep the accelerator pedal as steady as possible during the cruising.
    • If this procedure is not completed within 1 minute after restarting engine at step 4, return to step  4.
  7. If 1st trip DTC is displayed, go to "DIAGNOSTIC PROCEDURE ".
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