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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1174 (Automatic Transaxle - Re4F03B) >> DTC P0734: A/T 4TH Gear Function >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SHIFT UP (D3 TO D4) 

    During "Cruise Test - Part 1" ( "CRUISE TEST - PART 1 "), does A/T shift from D3 to D4 at the specified speed?

    Fig 1: Checking Shift Up (D3 To D4)
    G00899441Courtesy 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: Checking Line Pressure
    G00899442Courtesy 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
    G00899443Courtesy 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. 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.
    Fig 4: Checking Control Valve
    G00899444Courtesy of NISSAN MOTOR CO., U.S.A.

    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 transaxle internal components (clutch, brake, etc.).
  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
    G00899445Courtesy 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. Check line pressure circuit valves for sticking.
    • Pressure regulator valve
    • Pilot valve
    • Pressure modifier valve
    Fig 6: Checking Control Valve
    G00899446Courtesy of NISSAN MOTOR CO., U.S.A.

    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 transaxle internal components (clutch, brake, etc.).
  9. CHECK DTC 

    Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE ".

    OK or NG 

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