LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1207 (Automatic Transmission) >> Trouble Diagnosis For Symptoms >> Large Shock ("N" to "D" Position) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SELF-DIAGNOSTIC RESULTS 

    Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

    Do the self-diagnostic results indicate A/T fluid temperature sensor, engine speed signal, accelerator pedal position sensor, ATF pressure switch 1, front brake solenoid valve, CAN communication line? 

    1. YES: Check the malfunctioning system. Refer to "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT ", "DTC P0725 ENGINE SPEED SIGNAL ", "DTC P1705 THROTTLE POSITION SENSOR ", "DTC P1841 ATF PRESSURE SWITCH 1 ", "DTC P1757 FRONT BRAKE SOLENOID VALVE ", "DTC U1000 CAN COMMUNICATION LINE ".
    2. NO: GO TO 2.
  2. ENGINE IDLE SPEED 

    Check the engine idle speed. Refer to "IDLE SPEED AND IGNITION TIMING CHECK ".

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair.
  3. CHECK CONTROL CABLE 

    Check the control cable.

    Fig 1: Checking Control Cable
    G02382516Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Adjust control cable. Refer to "ADJUSTMENT OF A/T POSITION ".
  4. CHECK A/T FLUID LEVEL 

    Check the A/T fluid level. Refer to "CHECKING A/T FLUID ".

    Fig 2: Checking A/T Fluid Level
    G02382517Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Refill ATF.
  5. CHECK LINE PRESSURE 

    Check line pressure at idle with selector lever in "D" position. Refer to "LINE PRESSURE TEST ".

    Fig 3: Checking Line Pressure
    G02382518Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  8.
    2. NG - 1: Line pressure high: GO TO 6.
    3. NG - 2: Line pressure low: GO TO  7.
  6. DETECT MALFUNCTIONING ITEM 
    1. Check control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. Disassemble A/T. Refer to "DISASSEMBLY ".
    3. Check the following items:
      • Oil pump assembly. Refer to "OIL PUMP ".

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair or replace damaged parts.
  7. DETECT MALFUNCTIONING ITEM 
    1. Check control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. Disassemble A/T. Refer to "DISASSEMBLY ".
    3. Check the following items:

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair or replace damaged parts.
  8. CHECK A/T FLUID CONDITION 
    1. Remove oil pan. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. Check A/T fluid condition. Refer to "CHECKING A/T FLUID ".
    Fig 4: Checking A/T Fluid Condition
    G02382519Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  10.
    2. NG: GO TO 9.
  9. DETECT MALFUNCTIONING ITEM 
    • Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "SYMPTOM CHART " (Symptom No.1).

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Repair or replace damaged parts.
  10. CHECK SYMPTOM 

    Check again. Refer to "CHECK AT IDLE ".

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 11.
  11. PERFORM TCM INSPECTION 
    1. Perform TCM input/output signals inspection. Refer to "TCM INPUT/OUTPUT SIGNAL REFERENCE VALUES ".
    2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: Repair or replace damaged parts.
scientia non olet · About LEMON Manuals