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.

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)
Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No
1. Yes: GO TO 10.
2. No: GO TO 2.
CHECK LINE PRESSURE
Perform line pressure test.

Refer to LINE PRESSURE TEST .

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

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 6.
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
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Repair control valve.
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.
CHECK DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 10. Check lock-up condition.
CHECK LINE PRESSURE SOLENOID VALVE
1. Remove control valve assembly.
  Refer to REMOVAL .
2. Check line pressure solenoid valve operation.
  Refer to COMPONENT INSPECTION .
  
  Fig 4: Checking Line Pressure Solenoid Valve
  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.
  Refer to DISASSEMBLY .
2. Check line pressure circuit valves for sticking.
  - Pressure regulator valve
  - Pilot valve
  - Pressure modifier valve
  Fig 5: 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 (D3 TO D4)
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. Check for proper lock-up.
CHECK LOCK-UP CONDITION
CRUISE TEST - PART 1 , does A/T perform lock-up at the specified speed?

Fig 6: Checking Lock-Up Condition
Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No
1. Yes: CRUISE TEST - PART 1 again and return to the start point of this test group.
2. No: GO TO 11.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1. Remove control valve assembly.
  Refer to REMOVAL .
2. Check torque converter clutch solenoid valve operation. Refer to TORQUE CONVERTER CLUTCH SOLENOID VALVE .
  
  Fig 7: Checking Torque Converter Clutch Solenoid Valve Operation
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 12.
2. NG: Replace solenoid valve assembly.
CHECK CONTROL VALVE
1. Disassemble control valve assembly.
  Refer to DISASSEMBLY .
  
  Fig 8: Checking Control Valve
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check control valves for sticking.
  - Torque converter clutch control valve
  - Torque converter clutch relief valve
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 test group.