LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2004 >> QX56 AWD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Line Pressure Switch >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK MALFUNCTION 

    Is this malfunction detected only while driving in reverse?

    Yes or No

    1. Yes: Check A/T PNP switch "R" position.
    2. No: GO TO 2.
  2. CHECK OTHER MALFUNCTIONS 

    Are other malfunctions also detected by self-diagnosis and CONSULT-II?

    Refer to TROUBLE DIAGNOSIS WITHOUT CONSULT-II  and TROUBLE DIAGNOSIS WITH CONSULT-II .

    Yes or No

    1. Yes: Check for other malfunctions.
      • (When other malfunctions are eliminated, line pressure switch malfunction display may disappear.)
    2. No: GO TO 3.
  3. CHECK INPUT SIGNAL 

    Do you have CONSULT-II?

    Yes or No

    1. Yes: GO TO 4.
    2. No: GO TO 5.
  4. CHECK INPUT SIGNAL 

    With CONSULT-II 

    1. Select "ECU INPUT SIGNALS" in Data Monitor.
      2. Fig 1: Checking Input Signal
      G02250529Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Put A/T selector lever in D.
    3. Turn the 4WD shift switch to 4H and back to 2WD while reading out ON/OFF status of "LINE PRES SW".
      4. Fig 2: Displaying CONSULT-II MONITOR DATA Screen
      G02250530Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 6.
    2. NG: Check the following.
      • Continuity between transfer control unit and transfer terminal cord assembly harness connector
      • Line pressure switch

    Refer to 4WD SOLENOID VALVE, CLUTCH PRESSURE SWITCH AND LINE PRESSURE SWITCH .

  5. CHECK INPUT SIGNAL 

    Without CONSULT-II 

    1. Turn ignition switch to ON position.
    2. Check voltage between transfer control unit harness connector E143 terminal 35 (BR/W) and ground.

    After the vehicle has been left for at least 5 minutes at room temperature with ignition switch OFF : Approx. 0 volts should exist. 

    With ignition switch in ON, 4WD shift switch in AUTO or 4H and A/T selector lever in D : Battery voltage should exist. 

    Fig 3: Checking Voltage Between E143 Terminal 35 And Ground
    G02250531Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 4: Identifying 4WD Shift Switch
    G02250532Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 6.
    2. NG: Check the following.
  6. PERFORM SELF-DIAGNOSIS AGAIN 
    1. Check hydraulic parts.
    2. After driving for a while, perform self-diagnosis again. Refer to TROUBLE DIAGNOSIS WITHOUT CONSULT-II .

    OK or NG

    1. OK: Inspection End.
    2. NG:
      1. Perform transfer control unit input/output signal inspection. Refer to TRANSFER CONTROL UNIT INSPECTION TABLE .
      2. If NG, recheck transfer control unit pin terminals for damage or loose connection with harness connector.
scientia non olet · About LEMON Manuals