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Home >> Nissan-Datsun >> 2004 >> Sentra Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - QG18DE >> DTC P1271: A/F Sensor 1 >> Overall Function Check
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Overall Function Check

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC might not be confirmed.

With GST 

  1. Start engine and warm it up to normal operating temperature.
  2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or 3rd position (M/T).
    NOTE: Keep the accelerator pedal as steady as possible during the cruising.
  3. Set D position with "OD" ON (A/T) or 4th position (M/T), then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
    NOTE: Never apply brake during releasing the accelerator pedal.
  4. Repeat steps 2 to 3 five times.
  5. Stop the vehicle and turn ignition switch OFF.
  6. Wait at least 10 seconds and restart engine.
  7. Repeat steps 2 to 3 five times.
  8. Stop the vehicle and connect GST to the vehicle.
  9. Make sure that no DTC is displayed.

    If the DTC is displayed, go to DIAGNOSTIC PROCEDURE .

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