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Home >> Nissan-Datsun >> 2005 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> External Pages >> Different variant/trim >> Section 2 (Engine Control System (QG18DE)) >> DTC P0172: Fuel Injection System Function >> Diagnostic Trouble Codes Confirmation Procedure
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Diagnostic Trouble Codes Confirmation Procedure

WARNING: This page is about a different variant/trim than selected.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

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. Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.
  4. Clear the self-learning control coefficient by touching "CLEAR" or "START".
  5. Select "DATA MONITOR" mode with CONSULT-II.
    Fig 1: CONSULT-II Display - WORK SUPPORT Mode
    G02449879Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Start engine again and let it idle for at least 10 minutes. The 1st trip DTC P0172 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.
    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 the table below.

      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: Engine Speed, Vehicle Speed & Engine Coolant Temperature
      G02449880Courtesy of NISSAN MOTOR CO., U.S.A.
  7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction.
  8. Crank engine while depressing accelerator pedal. If engine starts, go to "DIAGNOSTIC PROCEDURE ". If engine does not start, remove ignition plugs and check for fouling, etc.

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. Then restart and run engine for at least 5 seconds at idle speed.
    Fig 3: Disconnecting Mass Air Flow Sensor Harness Connector
    G02449881Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Stop engine and reconnect mass air flow sensor harness connector.
  5. Select Service $03 with GST. Make sure DTC P0102 is detected.
  6. Select Service $04 with GST and erase the DTC P0102.
  7. Start engine again and run it for at least 10 minutes at idle speed.
  8. Select Service $07 with GST. The 1st trip DTC P0172 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.
    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 the table below.

      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 4: Freeze Frame Data: Engine Speed, Vehicle Speed & Engine Coolant Temperature
    G02449882Courtesy of NISSAN MOTOR CO., U.S.A.
  9. If it is difficult to start engine at step 7, the fuel injection system has a malfunction.
  10. Crank engine while depressing accelerator pedal.

    If engine starts, go to "DIAGNOSTIC PROCEDURE ". If engine does not start, remove ignition plugs and check for fouling, etc.

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