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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 777 (Automatic Transaxle Re4F03B) >> Diagnostic Trouble Code Definitions >> DTC P0734: A/T 4TH Gear Function >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SHIFT UP (D3 TO D4) 

    CRUISE TEST - PART 1 , does A/T shift from D3 to D4 at the specified speed?

    Fig 1: Checking Shift Up (D3 To D4)
    G02015751Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

    1. Yes: GO TO  9.
    2. No: GO TO 2.

  2. CHECK LINE PRESSURE 

    Perform line pressure test.

    Refer to LINE PRESSURE TEST .

    Fig 2: Line Pressure Specifications
    G02015752Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: GO TO  6.

  3. CHECK SOLENOID VALVES 
    1. Remove control valve assembly.

      Refer to REMOVAL .

    2. Refer to SOLENOID VALVES .
      Fig 3: Checking Solenoid Valves
      G02015753Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Replace solenoid valve assembly.

  4. CHECK CONTROL VALVE 
    1. Disassemble control valve assembly.

      Refer to DISASSEMBLY .

      2. Fig 4: Checking Control Valve
      G02015754Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check to ensure that:
      • Valve, sleeve and plug slide along valve bore under their own weight.
      • Valve, sleeve and plug are free from burrs, dents and scratches.
      • Control valve springs are free from damage, deformation and fatigue.
      • Hydraulic line is free from obstacles.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair control valve.

  5. CHECK SHIFT UP (D3 TO D4) 

    Does A/T shift from D3 to D4 at the specified speed?

    OK or NG 

    1. OK: GO TO  9.
    2. NG: Check control valve again. Repair or replace control valve assembly.

  6. CHECK LINE PRESSURE SOLENOID VALVE 
    1. Remove control valve assembly.

      Refer to REMOVAL .

    2. Refer to COMPONENT INSPECTION .
      Fig 5: Checking Line Pressure Solenoid Valve
      G02015755Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace solenoid valve assembly.

  7. CHECK CONTROL VALVE 
    1. Disassemble control valve assembly.

      Refer to DISASSEMBLY .

      2. Fig 6: Checking Control Valve
      G02015756Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check line pressure circuit valves for sticking.
      • Pressure regulator valve
      • Pilot valve
      • Pressure modifier valve

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair control valve.

  8. CHECK SHIFT UP (D3 TO D4) 

    Does A/T shift from D3 to D4 at the specified speed?

    Yes or No 

    1. Yes: GO TO 9.
    2. No: Check control valve again. Repair or replace control valve assembly.

  9. CHECK DTC 

    Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: Perform CRUISE TEST - PART 1  again and return to the start point of this test group.

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