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 Vehicle speed sensor-A/T (revolution sensor), A/T fluid temperature sensor, Vehicle speed sensor-MTR, engine speed signal, torque converter clutch solenoid valve circuit after cruise test?

   Fig 1: Checking Self-Diagnostic Results

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

   Yes or No 

   1. Yes: Check damaged circuit. Refer to "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR) ", "DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT ", "DTC VEHICLE SPEED SENSOR MTR ", "DTC P0725 ENGINE SPEED SIGNAL ", "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE ".
   2. No: GO TO 2.
2. CHECK ACCELERATOR PEDAL POSITION (APP) SENSOR 

   Check accelerator pedal position (APP) sensor. Refer to "DTC P1705 THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR] ".

   Fig 2: Identifying Accelerator Pedal Position (APP) Sensor

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

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Repair or replace accelerator pedal position (APP) sensor circuit.
3. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
   2. Check the following items:
      • Torque converter clutch control valve
      • Torque converter relief valve
      • Pilot valve
      • Pilot filter
   3. Disassemble A/T.
   4. Check the following items:
      • Torque converter

   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. Refer to "TCM TERMINALS AND REFERENCE VALUE ".
   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.