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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1517 (Automatic Transmission (Re4F04W)) >> DTC P0744: A/T TCC S/V Function (Lock-Up) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SHIFT UP (D 3  TO D 4  ) 
    Fig 1: Depressing A/T Shift From (D3 To D4)
    G02475231Courtesy of NISSAN MOTOR CO., U.S.A.

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

    Yes or No

    • Yes: GO TO 11.
    • No: GO TO 2.
  2. CHECK LINE PRESSURE 

    Perform line pressure test.

    Fig 2: Line Pressure Chart
    G02475232Courtesy of NISSAN MOTOR CO., U.S.A.

    Refer to "LINE PRESSURE TEST ".

    OK or NG

    • OK: GO TO 3.
    • NG: GO TO 6.
  3. CHECK CONTROL VALVE 
    Fig 3: Removing Control Valve Assembly
    G02475233Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Disassemble control valve assembly. Refer to "CONTROL VALVE ASSEMBLY ".
    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

    • OK: GO TO 4.
    • NG: Repair control valve.
  4. CHECK SHIFT UP (D 3  TO D 4  ) 

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

    OK or NG

    • OK: GO TO 5.
    • NG: Check control valve again. Repair or replace control valve assembly.
  5. CHECK DTC 

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

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO 11.
  6. CHECK VALVE RESISTANCE 
    1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
      • Line pressure solenoid valve
    2. Check resistance to the terminal and ground.
      Fig 4: Connector Terminal Reference Resistance Specification Chart
      G02475234Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Checking Resistance Between Terminals
      G02475235Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 8.
    • NG: Replace solenoid valve assembly.
  7. CHECK VALVE OPERATION 
    1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
      • Line pressure solenoid valve
    2. Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
      Fig 6: Checking Solenoid Valve Applying Battery Voltage
      G02475236Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 8.
    • NG: Replace solenoid valve assembly.
  8. CHECK CONTROL VALVE 
    Fig 7: Removing Control Valve Assembly
    G02475237Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Disassemble control valve assembly. Refer to "CONTROL VALVE ASSEMBLY ".
    2. Check line pressure circuit valves for sticking.
      • Pressure regulator valve
      • Pilot valve
      • Pressure modifier valve

    OK or NG

    • OK: GO TO 9.
    • NG: Repair control valve.
  9. CHECK SHIFT UP (D 3  TO D 4  ) 

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

    OK or NG

    • OK: GO TO 10.
    • NG: Check control valve again. Repair or replace control valve assembly.
  10. CHECK DTC 

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

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO 11.
  11. CHECK LOCK-UP 
    Fig 8: Depressing A/T Lock-Up (D4 & D4 L/U)
    G02475238Courtesy of NISSAN MOTOR CO., U.S.A.

    During "CRUISE TEST - PART 1 ", does A/T perform lock-up at the specified speed?

    Yes or No

    • Yes: Perform "CRUISE TEST - PART 1 " again and return to the start point of this test group.
    • No: GO TO 12.
  12. CHECK VALVE RESISTANCE 
    1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
      • Torque converter clutch solenoid valve
    2. Check resistance to the terminal and ground.
      Fig 9: Connector Terminal Reference Resistance Specification Chart
      G02475239Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 10: Checking Resistance Between Terminals
      G02475240Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 14.
    • NG: Replace solenoid valve assembly.
  13. CHECK VALVE OPERATION 
    1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
      • Torque converter clutch solenoid valve
    2. Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
      Fig 11: Checking Solenoid Valve Applying Battery Voltage
      G02475241Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 14.
    • NG: Replace solenoid valve assembly.
  14. CHECK CONTROL VALVE 
    Fig 12: Identifying Control Valve Assembly
    G02475242Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Disassemble control valve assembly. Refer to "CONTROL VALVE ASSEMBLY ".
    2. Check control valves for sticking.
      • Torque converter clutch control valve
      • Torque converter clutch relief valve

    OK or NG

    • OK: GO TO 15.
    • NG: Repair control valve.
  15. CHECK LOCK-UP 

    Does A/T perform lock-up at the specified speed?

    Yes or No

    • Yes: GO TO 16.
    • No: Check control valve again. Repair or replace control valve assembly.
  16. CHECK DTC 

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

    OK or NG

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