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 

   Check throttle position sensor. Refer to DTC P0121, DTC P0122 OR DTC P0123: TP SENSOR or DTC P0121, DTC P0122 OR DTC P0123: THROTTLE POSITION SENSOR (TP) .

   Fig 2: Locating Throttle Position Sensor & Switch

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

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Repair or replace throttle position 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:
      1. Perform TCM input/output signal inspection.
      2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.