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Home >> Nissan-Datsun >> 2005 >> Quest Base >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0171, P0174: Fuel Injection System Function >> Diagnostic Trouble Codes 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. Restart engine and let it idle for at least 5 seconds.
  5. Stop engine and reconnect mass air flow sensor harness connector.
  6. Select "Service $03" with GST. Make sure DTC P0102 is detected.
  7. Select "Service $04" with GST and erase the DTC P0102.
  8. Start engine again and let it idle for at least 10 minutes.
  9. Select "Service $07" with GST. The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, go to "DIAGNOSTIC PROCEDURE ".
    NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
    Fig 1: Disconnecting Mass Air Flow Sensor Harness Connector
    G02446993Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to Fig 2.

      Hold the accelerator pedal as steady as possible. 

    The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

    Fig 2: Freeze Frame Data
    G02446994Courtesy of NISSAN MOTOR CO., U.S.A.
  10. If it is difficult to start engine at step 8, the fuel injection system has a malfunction.
  11. Crank engine while depressing accelerator pedal. If engine starts, go to "DIAGNOSTIC PROCEDURE ". If engine does not start, check exhaust and intake air leak visually.