Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK SHIFT UP (D ₃ TO D ₄ )
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 )
Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No
1. Yes:
  - GO TO 10.
  - And check for proper lock-up.
2. No: GO TO 2.
CHECK LINE PRESSURE
Perform LINE PRESSURE TEST .

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 6.
CHECK CONTROL VALVE
1. Disassemble 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.
    
    Fig 2: Checking Control Valve
    Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Repair control valve.
CHECK SHIFT UP (D ₃ TO D ₄ )
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.
CHECK DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE , .

OK or NG
1. OK: INSPECTION END
2. NG:
  - GO TO 10.
  - And check for proper lock-up.
CHECK LINE PRESSURE SOLENOID VALVE
1. Remove CONTROL VALVE ASSEMBLY AND ACCUMULATORS .
2. Check line pressure solenoid valve operation. Refer to COMPONENT INSPECTION .
  
  Fig 3: Checking Line Pressure Solenoid Valve Operation
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 7.
2. NG: Replace solenoid valve assembly.
CHECK CONTROL VALVE
1. Disassemble CONTROL VALVE ASSEMBLY .
2. Check line pressure circuit valves for sticking.
  - Pressure regulator valve
  - Pilot valve
  - Pressure modifier valve
    
    Fig 4: Checking Control Valve
    Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 8.
2. NG: Repair control valve.
CHECK SHIFT UP (D ₃ TO D ₄ )
Does A/T shift from D₃ to D₄ at the specified speed?

Yes or No
1. Yes: GO TO 9.
2. No: Check control valve again. Repair or replace control valve assembly.
CHECK DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE , .

OK or NG
1. OK: INSPECTION END
2. NG:
  - GO TO 10.
  - And check for proper lock-up.
CHECK LOCK-UP CONDITION
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 flow chart.
2. No: GO TO 11.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1. Remove CONTROL VALVE ASSEMBLY AND ACCUMULATORS .
2. Check torque converter clutch solenoid valve operation. Refer to COMPONENT INSPECTION .
OK or NG
1. OK: GO TO 12.
2. NG: Replace solenoid valve assembly.
CHECK CONTROL VALVE
1. Disassemble CONTROL VALVE ASSEMBLY .
2. Check control valves for sticking.
  - Torque converter clutch control valve
  - Torque converter clutch relief valve
    
    Fig 5: Checking Control Valve
    Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 13.
2. NG: Repair control valve
CHECK LOCK-UP CONDITION
Does A/T perform lock-up at the specified speed?

Yes or No
1. Yes: GO TO 14.
2. No: Check control valve again. Repair or replace control valve assembly.
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 flow chart.