12. A/T Does Not Perform Lock-up

SYMPTOM: 

A/T does not perform lock-up at the specified speed. 

1. CHECK SELF-DIAGNOSTIC RESULTS 

   Does self-diagnosis show damage to torque converter clutch solenoid valve circuit after cruise test?

   Yes or No

   1. Yes: Check torque converter clutch solenoid valve circuit. Refer to "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE ".
   2. No: GO TO 2.
      Fig 1: Checking Self-Diagnostic Result

      Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR] 

   Check throttle position sensor [accelerator pedal position (APP) sensor]. Refer to "DTC P0122, P0123: TP SENSOR " and "DTC P2122, P2123: APP SENSOR " (with QR25DE), or "DTC P0122, P0123: TP SENSOR " and "DTC P2122, P2123: APP SENSOR " (with VQ35DE).

   OK or NG

   1. OK: GO TO 3.
   2. NG: Repair or replace throttle position sensor [accelerator pedal position (APP) sensor].
      Fig 2: Throttle Position Sensor

      Courtesy of NISSAN MOTOR CO., U.S.A.
3. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
   2. Check following items:
      • Torque converter clutch control valve
      • Torque converter relief valve
      • Torque converter clutch solenoid valve
      • Pilot valve
      • Pilot filter

   OK or NG

   1. OK: GO TO 4.
   2. NG: Repair or replace damaged parts.
4. CHECK SYMPTOM 

   Check again.

   OK or NG

   1. OK: INSPECTION END 
   2. NG: GO TO 5.
5. CHECK TCM INSPECTION 
   1. Perform TCM input/output signal inspection.
   2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

   OK or NG

   1. OK: INSPECTION END 
   2. NG: Repair or replace damaged parts.