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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1207 (Automatic Transmission) >> Trouble Diagnosis For Symptoms >> A/T Does Not Shift: D2 --> D3 >> 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. CONFIRM THE SYMPTOM 

    Check if vehicle creeps forward in "D" position and vehicle can be started from D1.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Refer to "Vehicle Does Not Creep Forward In "D " Position", "VEHICLE CANNOT BE STARTED FROM D1 ".
  2. CHECK SELF-DIAGNOSTIC RESULTS 

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

    Do the self-diagnostic results indicate ATF pressure switch 6, high and low reverse clutch solenoid valve, accelerator pedal position sensor, vehicle speed sensor A/T (revolution sensor) and vehicle speed sensor MTR? 

    1. YES: Check the malfunctioning system. Refer to "DTC P1846 ATF PRESSURE SWITCH 6 ", "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE ", "DTC P1705 THROTTLE POSITION SENSOR ", "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR) ", "DTC P1721 VEHICLE SPEED SENSOR MTR ".
    2. NO: GO TO 3.
  3. CHECK A/T FLUID LEVEL 

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

    Fig 1: Checking A/T Fluid Level
    G02382536Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Refill ATF.
  4. CHECK LINE PRESSURE 
    Fig 2: Checking Line Pressure
    G02382537Courtesy of NISSAN MOTOR CO., U.S.A.

    Check line pressure at the engine stall point. Refer to "LINE PRESSURE TEST ".

    OK or NG 

    1. OK: GO TO  7.
    2. NG - 1: Line pressure high. GO TO 5.
    3. NG - 2: Line pressure low. GO TO  6.
  5. 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  7.
    2. NG: Repair or replace damaged parts.
  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:

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Repair or replace damaged parts.
  7. 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 "FLUID CONDITION CHECK ".
    Fig 3: Checking A/T Fluid Condition
    G02382538Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: GO TO  11.
  8. DETECT MALFUNCTIONING ITEM 
    • Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "SYMPTOM CHART " (Symptom No. 11).

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair or replace damaged parts.
  9. CHECK SYMPTOM 

    Check again. Refer to "CRUISE TEST - PART 1 ", "CRUISE TEST - PART 2 "

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 10.
  10. 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.
  11. DETECT MALFUNCTIONING ITEM 
    • Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "SYMPTOM CHART " (Symptom No. 11).

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair or replace damaged parts.
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