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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Automatic Transaxle) >> DTC P0744 A/T TCC S/V Function (Lock-Up) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  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: Pressing Accelerator Pedal (D3 To D4)
      G02886663Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK LINE PRESSURE 

    Perform line pressure test.

    Fig 2: Line Pressure Test Reference Chart
    G02886664Courtesy 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 "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

    1. OK: GO TO 4.
    2. NG: Repair control valve.
      Fig 3: Checking Control Valve
      G02886665Courtesy 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?

    OK or NG

    1. OK: GO TO 5.
    2. NG: 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 "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
      • Line pressure solenoid valve
    2. Check resistance to the terminal and ground.
      Fig 4: Solenoid Valve Terminal Resistance Chart
      G02886666Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO  8.
    2. NG: Replace solenoid valve assembly.
      Fig 5: Line Pressure Solenoid Valve, Terminal 4 Continuity Test
      G02886667Courtesy of NISSAN MOTOR CO., U.S.A.
  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.

    OK or NG

    1. OK: GO TO 8.
    2. NG: Replace solenoid valve assembly.
      Fig 6: Checking Solenoid Valve
      G02886668Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK CONTROL VALVE 
    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

    1. OK: GO TO 9.
    2. NG: Repair control valve.
      Fig 7: Checking Control Valve
      G02886669Courtesy 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?

    OK or NG

    1. OK: GO TO 10.
    2. NG: 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?

    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.
      Fig 8: Pressing Accelerator Pedal
      G02886670Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Solenoid Valve Terminal Resistance Chart
      G02886671Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO  14.
    2. NG: Replace solenoid valve assembly.
      Fig 10: Torque Converter Clutch Solenoid Valve, Terminal 5 Continuity Test
      G02886672Courtesy of NISSAN MOTOR CO., U.S.A.
  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.

    OK or NG

    1. OK: GO TO 14.
    2. NG: Replace solenoid valve assembly.
      Fig 11: Checking Valve Operation
      G02886673Courtesy of NISSAN MOTOR CO., U.S.A.
  14. CHECK CONTROL VALVE 
    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

    1. OK: GO TO 15.
    2. NG: Repair control valve.
      Fig 12: Checking Control Valve
      G02886674Courtesy 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 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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