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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 778 (Automatic Transaxle Re4F04B) >> DTC P0744 A/T TCC S/V Function (Lock-Up) >> Diagnostic Procedure

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) 

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

    Fig 1: Checking Shift Up (D3 To D4)
    G02016743Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

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

    Perform line pressure test.

    Fig 2: Line Pressure Specifications
    G02016744Courtesy of NISSAN MOTOR CO., U.S.A.

    Refer to LINE PRESSURE TEST .

    OK or NG 

    1. OK: GO TO 3.
    2. NG: GO TO  6.
  3. 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 3: Checking Control Valve
      G02016745Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair control valve.
  4. 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 5.
    2. No: Check control valve again. Repair or replace control valve assembly.
  5. CHECK DTC 

    Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO  11. Check for proper lock-up.
  6. CHECK VALVE RESISTANCE 
    1. Remove control valve assembly. Refer to REMOVAL .
      • Line pressure solenoid valve
    2. Check resistance to the terminal and ground.
      Fig 4: Checking Valve Resistance
      G02016746Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  8.
    2. NG: Replace solenoid valve assembly.
  7. CHECK VALVE OPERATION 
    1. Remove control valve assembly. Refer to REMOVAL .
      • Line pressure solenoid valve
    2. Check solenoid valve by listening for its operating sound while applying battery voltage and ground to the solenoid.
      Fig 5: Checking Valve Operation
      G02016747Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace solenoid valve assembly.
  8. 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
      G02016748Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair control valve.
  9. 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 10.
    2. No: Check control valve again. Repair or replace control valve assembly.
  10. CHECK DTC 

    Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 11. Check for proper lock-up.
  11. CHECK LOCK-UP 

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

    Fig 7: Checking Lock-Up Condition
    G02016749Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

    1. Yes: Perform Cruise test - Part 1 again and return to the start point of this test group.
    2. No: GO TO 12.
  12. CHECK VALVE RESISTANCE 
    1. Remove control valve assembly. Refer to REMOVAL .
      • Torque converter clutch solenoid valve
    2. Check resistance between terminal cord assembly connector F30 terminal 5 and ground.
      Fig 8: Checking Valve Resistance
      G02016750Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  14.
    2. NG: Replace solenoid valve assembly.
  13. CHECK VALVE OPERATION 
    1. Remove control valve assembly. Refer to REMOVAL .
      • Torque converter clutch solenoid valve
    2. Check solenoid valve by listening for its operating sound while applying battery voltage and ground to the solenoid.
      Fig 9: Checking Valve Operation
      G02016751Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 14.
    2. NG: Replace solenoid valve assembly.
  14. CHECK CONTROL VALVE 
    1. Disassemble control valve assembly. Refer to DISASSEMBLY .
    2. Check control valves for sticking.
      • Torque converter clutch control valve
      • Torque converter clutch relief valve
      Fig 10: Checking Control Valve
      G02016752Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

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

    Yes or No 

    1. Yes: GO TO 16.
    2. No: Check control valve again. Repair or replace control valve assembly.
  16. 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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