Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Altima. 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?

Yes or No
1. Yes: GO TO 11.
2. No: GO TO 2.
Fig 1: Checking Shift Up (D3 TO D₄ )
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK LINE PRESSURE
Perform line pressure test.

Fig 2: Line Pressure Test Chart DTC P0734
Courtesy of NISSAN MOTOR CO., U.S.A.

Refer to "LINE PRESSURE TEST ".

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 7.
CHECK VALVE RESISTANCE
1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
  - Shift solenoid valve A
  - Shift solenoid valve B
2. Check resistance between two terminals.
  
  Fig 3: Solenoid Valve A And B Resistance Chart DTC P0734
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Replace solenoid valve assembly.
Fig 4: Checking Resistance Between Solenoid Valve A And B Terminal 2, 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK VALVE OPERATION
1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
  - Shift solenoid valve A
  - Shift solenoid valve B
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 5.
2. NG: Replace solenoid valve assembly.
Fig 5: Checking Operation Of Solenoid Valve A And B
Courtesy of NISSAN MOTOR CO., U.S.A.
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 vale springs are free from damage, deformation and fatigue.
- Hydraulic lines is free from obstacles.
OK or NG
1. OK: GO TO 6.
2. NG: Repair control valve.
Fig 6: Identifying Control Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK SHIFT UP (D ₃ TO D ₄ )
Does A/T shift from D₃ to ₄ Specified speed?

OK or NG
1. OK: GO TO 11.
2. NG: Check control valve again. Repair or replace control valve assembly.
CHECK VALVE RESISTANCE
1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
2. Line pressure solenoid valves
3. Check resistance to the terminal and ground.
  
  Fig 7: Line Pressure Solenoid Valve Resistance Chart DTC P0734
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 9.
2. NG: Replace solenoid valve assembly.
Fig 8: Checking Resistance Between Line Pressure Solenoid Valve Terminal 4 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK VALVE OPERATION
1. Remove control valve assembly. Refer to " CONTROL VALVE ASSEMBLY AND ACCUMULATORS " .
2. Line pressure solenoid valves
3. 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 9.
2. NG: Replace solenoid valve assembly.
Fig 9: Checking Operation Of Line Pressure Solenoid Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
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 10.
2. NG: Repair control valve.
Fig 10: Identifying Control Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK SHIFT UP (D ₃ TO D ₄ )
Does A/T shift from D₃ to D₄ at the specified speed?

OK or NG
1. OK: GO TO 11.
2. NG: 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.