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.

CHECK SHIFT UP (D3 TO D4)
During "Cruise Test - Part 1" ( "CRUISE TEST - PART 1 "), does A/T shift from D3 to D4 at the specified speed?

Fig 1: Check 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: Checking Line Pressure
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 transaxle internal components (clutch, brake, etc.).
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 transaxle internal components (clutch, brake, etc.).
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
During "Cruise Test - Part 1" ( "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: Perform "Cruise Test - Part 1" ( "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
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 ".
2. Check control valves for sticking.
  - Torque converter clutch control valve
  - Torque converter clutch relief valve
Fig 8: 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 transaxle internal components (clutch, brake, etc.).
CHECK DTC
Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE ".

OK or NG
1. OK: INSPECTION END
2. NG: Perform "Cruise Test - Part 1" ( "CRUISE TEST - PART 1 ") again and return to the start point of this test group.