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: Vehicle Speed Sensor - Blinking Pattern

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

   Yes or No

   • 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 ".
   • 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: Checking Accelerator Pedal Position Sensor

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

   OK or NG

   • OK: GO TO 3.
   • 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

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

   Check again.

   OK or NG

   • OK: INSPECTION END 
   • 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

   • OK: INSPECTION END 
   • NG: Repair or replace damaged parts.