Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK SHIFT UP (D3 TO D4)

Fig 1: Pressing Accelerator Pedal
Courtesy of NISSAN MOTOR CO., U.S.A.

During "CRUISE TEST - PART 1 ", does A/T shift from D3 to D4 at the specified speed?

Yes or No
- Yes: GO TO 11.
- No: GO TO 2.
CHECK LINE PRESSURE
Perform LINE PRESSURE TEST .

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

Refer to "LINE PRESSURE TEST ".

OK or NG
- OK: GO TO 3.
- 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: Checking Resistance Between Two Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Solenoid Valve Terminal Resistance Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 5.
- NG: Replace solenoid valve assembly.
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.
  
  Fig 5: Checking Valve Operation
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 5.
- NG: Replace solenoid valve assembly.
CHECK CONTROL VALVE

Fig 6: Checking Control Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
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
- OK: GO TO 6.
- NG: Repair control valve.
CHECK SHIFT UP (D ₃ TO D ₄ )
Does A/T shift from D₃ to D ₄ at the specified speed?

OK or NG
- OK: GO TO 11.
- NG: Check transaxle inner parts. (Clutch, brake, etc.)
CHECK VALVE RESISTANCE
1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS "
  - Line pressure solenoid valves
2. Check resistance to the terminal and ground.
  
  Fig 7: Solenoid Valve Terminal Resistance Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 8: Checking Valve Resistance
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 9.
- NG: Replace solenoid valve assembly.
CHECK VALVE OPERATION
1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
  - Line pressure solenoid valves
2. Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
  
  Fig 9: Checking Valve Operation
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 9.
- NG: Replace solenoid valve assembly.
CHECK CONTROL VALVE

Fig 10: Checking Control Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
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
- OK: GO TO 10.
- NG: Repair control valve.
CHECK SHIFT UP (D3 TO D4)
Does A/T shift from D 3 to D4 at the specified speed?

OK or NG
- OK: GO TO 11.
- NG: Check transaxle inner parts. (Clutch, brake, etc.)
CHECK DTC
Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE ".

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