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Home › Nissan-Datsun › 2004 › Xterra SE, 4WD › Repair and Diagnosis › Engine Performance › System › Engine Control System - VG33E › DTC P1402: EGR Function › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK VACUUM HOSE 

    Check vacuum hose for clogging, cracks or improper connection.

    OK or NG 

    1. OK (With CONSULT-II): GO TO 2.
    2. OK (Without CONSULT-II): GO TO  3.
    3. NG: Repair or replace vacuum hose.
    Fig 1: Checking Vacuum Hose For Clogging
    G00870694Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK EGRC SOLENOID VALVE CIRCUIT 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Turn EGRC solenoid valve "ON" and "OFF" in "ACTIVE TEST" mode with CONSULT-II and check operating sound.

      Clicking noise should be heard. 

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO  4.
    Fig 2: Identifying Display - Vacuum Test
    G00870695Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK EGRC SOLENOID VALVE CIRCUIT 

    Without CONSULT-II 

    1. Turn ignition switch OFF.
    2. Disconnect EGRC solenoid valve harness connector.
    3. Turn ignition switch ON.
    4. Check operating sound of the solenoid valve when disconnecting and reconnecting EGRC solenoid valve harness connector. (The DTC or the 1st trip DTC for the EGRC solenoid valve will be displayed, however, ignore it.)

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E43, M65
    • Harness connectors M59, F27
    • Fuse block (J/B) connector E49
    • 10A fuse
    • Harness for open or short between fuse and EGRC solenoid valve
    • Harness for open or short between ECM and EGRC solenoid valve
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK EGRC SOLENOID VALVE 

    With CONSULT-II 

    1. Perform "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode.
    2. Check air passage continuity and operation delay time under the following conditions.
      Fig 3: Air Passage Continuity Table
      G00870696Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Air Passage Continuity
      G00870697Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  7.
    2. NG: Replace EGRC solenoid valve.
  6. CHECK EGRC SOLENOID VALVE 

    Without CONSULT-II 

    1. Check air passage continuity and operation delay time under the following conditions.
      Fig 5: Air Passage Continuity Table
      G00870698Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 6: Checking Air Passage Continuity
      G00870699Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace EGRC solenoid valve.
  7. CHECK EGR VALVE 

    Refer to Component Inspection  .

    OK or NG 

    1. OK: GO TO  9.
    2. NG: Replace EGR valve.
  8. CHECK EGRC-BPT VALVE 

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace EGRC-BPT valve.
  9. CHECK EGR TEMPERATURE SENSOR 

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Replace EGR temperature sensor.
  10. CHECK INTERMITTENT INCIDENT 

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. INSPECTION END. 
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