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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1175 (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 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", 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)
    G00901666Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK LINE PRESSURE 

    Perform LINE PRESSURE TEST .

    Fig 2: Checking Line Pressure
    G00901667Courtesy 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.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair control valve.
    Fig 3: Checking Control Valve
    G00901668Courtesy of NISSAN MOTOR CO., U.S.A.
  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 transaxle internal components (clutch, brake, etc.).
  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
    G00901669Courtesy 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
    G00901670Courtesy 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

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair control valve.
    Fig 6: Checking Control Valve
    G00901671Courtesy of NISSAN MOTOR CO., U.S.A.
  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 transaxle internal components (clutch, brake, etc.).
  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 at the specified speed?

    Yes or No 

    1. Yes: GO TO Perform "CRUISE TEST - PART 1 " again and return to the start point of this test group.
    2. No: GO TO 12.
    Fig 7: Checking Lock-Up Condition
    G00901672Courtesy of NISSAN MOTOR CO., U.S.A.
  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
    G00901673Courtesy 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
    G00901674Courtesy 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

    OK or NG 

    1. OK: GO TO 15.
    2. NG: Repair control valve.
    Fig 10: Checking Control Valve
    G00901675Courtesy of NISSAN MOTOR CO., U.S.A.
  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 transaxle internal components (clutch, brake, etc.).
  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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