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Home >> Nissan-Datsun >> 2005 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U1000 To P0335 (Qr25DE) >> DTC P0172: Fuel Injection System Function >> Diagnostic Trouble Codes Confirmation Procedure

Diagnostic Trouble Codes Confirmation Procedure

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.
    Fig 1: Work Support - CONSULT-II Display Screen
    G02451035Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Clear the self-learning control coefficient by touching "CLEAR".
  5. Select "DATA MONITOR" mode with CONSULT-II.
  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 a certain time. Refer to the table in Fig 2.

      Hold the accelerator pedal as steady as possible. 

      The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation under the conditions listed in Fig 2 should be satisfied at the same time.

    Fig 2: DTC P0172 Confirmation Conditions
    G02451036Courtesy 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, too.
  8. Crank engine while depressing accelerator pedal.

    If engine starts, go to "DIAGNOSTIC PROCEDURE ". If engine does not start, remove spark 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
    G02451037Courtesy 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 let it idle for at least 10 minutes.
  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 (1 st trip) Freeze Frame Data for a certain time. Refer to the table in Fig 4.

      Hold the accelerator pedal as steady as possible. 

      The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation under the conditions in Fig 4 should be satisfied at the same time.

    Fig 4: DTC P0172 Confirmation Conditions
    G02451038Courtesy 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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