13. A/T Does Not Hold Lock-up Condition

SYMPTOM: 

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

1. CHECK 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 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 3.
   2. NG: GO TO  5.
   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 "REMOVAL ".
   2. Check the following items:
      • Torque converter clutch control 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. See INPUT/OUTPUT SIGNAL OF TCM .
      2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
5. DETECT MALFUNCTIONING ITEM 
   1. Remove control valve assembly. Refer to "REMOVAL ".
   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  4.
   2. NG: Repair or replace damaged parts.