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

   Yes or No 

   1. Yes: Check torque converter clutch solenoid valve circuit. Refer to "DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT ", "DTC P0720 VEHICLE SPEED SENSOR. A/T (REVOLUTION SENSOR) ", "DTC P0725 ENGINE SPEED SIGNAL ", "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE ", and "DTC VHCL SPEED SEN.MTR VEHICLE SPEED SENSOR.MTR ".
   2. No: GO TO 2.
   Fig 1: Checking Self-Diagnostic Results

   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 .

   OK or NG 

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

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve. Refer to "REMOVAL ".
   2. Check the following items:
      • Torque converter clutch control valve
      • Torque converter relief valve
      • Pilot valve
      • Pilot filter
   3. Remove A/T.
   4. Check 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:
      1. Perform TCM input/output signal inspection. See INPUT/OUTPUT SIGNAL OF TCM .
      2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.