A/T Does Not Hold Lock-up Condition

SYMPTOM: 

A/T does not hold lock-up condition for more than 30 seconds  .

1. CHECK SELF-DIAGNOSTIC RESULTS 

   Does self-diagnosis show damage to engine speed signal circuit after cruise test?

   Yes or No 

   1. Yes: Check engine speed signal circuit. Refer to "DTC P0725 ENGINE SPEED SIGNAL ".
   2. No: GO TO 2.
   Fig 1: Checking Self-Diagnostic Results

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK A/T FLUID CONDITION 
   1. Remove oil pan.
   2. Check A/T fluid condition.

   OK or NG 

   1. OK: GO TO  4.
   2. NG: GO TO 3.
   Fig 2: Checking A/T Fluid Condition

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
   2. Check the following items:
      • Torque converter clutch control valve
      • Pilot valve
      • Pilot filter
   3. Disassemble A/T.
   4. Check torque converter and oil pump assembly.

   OK or NG 

   1. OK: GO TO  5.
   2. NG: Repair or replace damaged parts.
4. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve assembly. Refer to "CONTROL VALVE ASSEMBLY AND ACCUMULATORS ".
   2. Check the following items:
      • Torque converter clutch control valve
      • Pilot valve
      • Pilot filter

   OK or NG 

   1. OK: GO TO 5.
   2. NG: Repair or replace damaged parts.
5. CHECK SYMPTOM 

   Check again.

   OK or NG 

   1. OK: INSPECTION END 
   2. NG: GO TO 6.
6. 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.