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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - Re4F04B >> DTC P0734: A/T 4TH Gear Function >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK SHIFT UP (D3 TO D4) 

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

    Yes or No 

    1. Yes: GO TO  11.
    2. No: GO TO 2.
    Fig 1: Checking Shift Up (D3 To D4)
    G00901644Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK LINE PRESSURE 

    Perform LINE PRESSURE TEST .

    Fig 2: Checking Line Pressure
    G00901645Courtesy of NISSAN MOTOR CO., U.S.A.

    Refer to "LINE PRESSURE TEST ".

    OK or NG 

    1. OK: GO TO 3.
    2. NG: GO TO  7.
  3. CHECK VALVE RESISTANCE 
    1. Remove control valve assembly. Refer to "REMOVAL ".
      • Shift solenoid valve A
      • Shift solenoid valve B
    2. Check resistance between terminal cord assembly connector F30 terminals 1 and 2 and ground.
    Fig 3: Checking Valve Resistance
    G00901646Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  5.
    2. NG: Replace solenoid valve assembly.
  4. CHECK VALVE OPERATION 
    1. Remove control valve assembly. Refer to "REMOVAL ".
      • Shift solenoid valve A
      • Shift solenoid valve B
    2. Check solenoid valve by listening for its operating sound while applying battery voltage and ground to the solenoid.
    Fig 4: Checking Valve Operation
    G00901647Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Replace solenoid valve assembly.
  5. 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.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair control valve.
    Fig 5: Checking Control Valve
    G00901648Courtesy of NISSAN MOTOR CO., U.S.A.
  6. 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  11.
    2. No: Check transaxle internal components (clutch, brake, etc.).
  7. CHECK VALVE RESISTANCE 
    1. Remove control valve assembly. Refer to "REMOVAL ".
      • Line pressure solenoid valves
    2. Check resistance between the terminal cord assembly connector F30 terminal 4 and ground.
    Fig 6: Checking Valve Resistance
    G00901649Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  9.
    2. NG: Replace solenoid valve assembly.
  8. CHECK VALVE OPERATION 
    1. Remove control valve assembly. Refer to "REMOVAL ".
      • Line pressure solenoid valves
    2. Check solenoid valve by listening for its operating sound while applying battery voltage and ground to the solenoid.
    Fig 7: Checking Valve Operation
    G00901650Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace solenoid valve assembly.
  9. 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

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Repair control valve.
    Fig 8: Checking Control Valve
    G00901651Courtesy of NISSAN MOTOR CO., U.S.A.
  10. 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 11.
    2. No: Check transaxle internal components (clutch, brake, etc.).
  11. 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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