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?

   Fig 1: Checking Self-Diagnostic Result

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

   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.
2. CHECK THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR] 

   Check throttle position sensor [accelerator pedal position (APP) sensor]. Refer to DTC P0221 TP SENSOR and DTC P0226 APP SENSOR .

   Fig 2: Locating Throttle Position Sensor Components

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

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Repair or replace throttle position sensor [accelerator pedal position (APP) sensor].
3. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve. Refer to REMOVAL .
   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.