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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For Symptoms >> ATP Warning Lamp Turns ON >> 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 SYSTEM FOR CAN COMMUNICATION LINE 

    Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC PROCEDURE ".

    Do the self-diagnostic results indicate CAN communication? 

    1. YES: Perform trouble diagnosis for CAN communication line. Refer to "CAN COMMUNICATION LINE ".
    2. NO: GO TO 2.
  2. CHECK SYSTEM FOR 4WD SHIFT SWITCH 

    Perform trouble diagnosis for 4WD shift switch system. Refer to "4WD SHIFT SWITCH ".

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace damaged parts.
  3. CHECK SYSTEM FOR PNP SWITCH SIGNAL 

    Perform trouble diagnosis for PNP switch signal system. Refer to "PNP SWITCH SIGNAL (TCM) ".

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace damaged parts.
  4. CHECK SYSTEM FOR ATP SWITCH 

    Perform trouble diagnosis for ATP switch system. Refer to "ATP SWITCH ".

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair or replace damaged parts.
  5. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and combination meter harness connector.
    3. Check continuity between the following terminals.
      • Transfer control unit harness connector E142 terminal 15 (L/B) and combination meter harness connector M24 terminal 6 (L/B).
        1. Continuity should exist. 
        Fig 1: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminal 15 And Combination Meter Harness Connector M24 Terminal 6
        G02383164Courtesy of NISSAN MOTOR CO., U.S.A.
      • Transfer control unit harness connector E142 terminal 40 (L) and combination meter harness connector M24 terminal 7 (R/B).
        1. 40 to 7: Continuity should not exist. 
        2. 7 to 40: Continuity should exist. 

      Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or replace damaged parts.
    Fig 2: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminal 40 And Combination Meter Harness Connector M24 Terminal 7
    G02383165Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK ATP WARNING LAMP CIRCUIT 
    1. A/T selector lever in "P" position.
    2. Connect combination meter harness connector and transfer control unit harness connector.
    3. Disconnect ATP switch harness connector.
    4. Ground the following terminal using suitable wiring.
      • ATP switch harness connector F55 terminal 8 (L/Y) and ground.
    5. Turn ignition switch "ON". (Do not start engine.)

    Does indicator lamp turn on? 

    1. OK: GO TO 7.
    2. NG: Replace combination meter. Refer to "COMBINATION METER ".
    Fig 3: Grounding ATP Switch Harness Connector F55 Terminal 8
    G02383166Courtesy of NISSAN MOTOR CO., U.S.A.
  7. SYMPTOM CHECK 

    Check again.

    OK or NG 

    1. OK: Inspection End.
    2. NG: GO TO 8.
  8. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  9. CHECK TRANSFER INNER PARTS 
    1. Disassemble transfer assembly. Refer to "DISASSEMBLY AND ASSEMBLY ".
    2. Check transfer inner parts.

    OK or NG 

    1. OK: Inspection End.
    2. NG: Repair or replace damaged parts.
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