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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For System >> Clutch Pressure Solenoid >> 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 CLUTCH PRESSURE SIGNAL 

    With CONSULT-II 

    1. Start engine.
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
    3. Read out the value of "DUTY SOLENOID".
      Fig 1: Checking Clutch Pressure Signal
      G02383064Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Identifying "DUTY SOLENOID"
      G02383065Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Start engine.
    2. Check voltage between transfer control unit harness connector terminal and ground.
      Fig 3: Transfer Control Unit Harness Connector Terminals And Ground Voltage Specifications
      G02383066Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G02383067Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: GO TO 2.
  2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND CLUTCH PRESSURE SOLENOID VALVE 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector, transfer terminal cord assembly harness connector and transfer dropping resistor.
    3. Check continuity between transfer control unit harness connector E142 terminal 19 (L) and transfer terminal cord assembly harness connector F56 terminal 6 (L).
      1. Continuity should exist. 
      Fig 5: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminal 19 And Transfer Terminal Cord Assembly Harness Connector F56 Terminal 6
      G02383068Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between transfer dropping resistor harness connector E135 terminal 2 (L) and transfer terminal cord assembly harness connector F56 terminal 6 (L).
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace damaged parts.
    Fig 6: Checking Continuity Between Transfer Dropping Resistor Harness Connector E135 Terminal 2 And Transfer Terminal Cord Assembly Harness Connector F56 Terminal 6
    G02383069Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER DROPPING RESISTOR 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and transfer dropping resistor harness connector.
    3. Check continuity between transfer control unit harness connector E142 terminal 10 (L/W) and transfer dropping resistor harness connector E135 terminal 1 (L/W).
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace damaged parts.
    Fig 7: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminal 10 And Transfer Dropping Resistor Harness Connector E135 Terminal 1
    G02383070Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer terminal cord assembly harness connector.
    3. Check continuity between transfer terminal cord assembly harness connector F56 terminal 19 (B) and ground.
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
    Fig 8: Checking Continuity Between Transfer Terminal Cord Assembly Harness Connector F56 Terminal 19 And Ground
    G02383071Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK CLUTCH PRESSURE SOLENOID 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer terminal cord assembly harness connector.
    3. Check resistance between transfer terminal cord assembly terminals 6 and 19.
      1. 6 - 19: Approx. 3.0 - 3.4 Ω 

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Replace clutch pressure solenoid. Refer to "LOCATION OF ELECTRICAL PARTS ".
    Fig 9: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 6 And 19
    G02383072Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK TRANSFER DROPPING RESISTOR 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer dropping resistor harness connector. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Check resistance between transfer dropping resistor terminals 1 and 2.
      1. 1 - 2: Approx. 11.2 - 12.8 Ω 

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace transfer dropping resistor. Refer to "LOCATION OF ELECTRICAL PARTS ".
    Fig 10: Checking Resistance Between Transfer Dropping Resistor Terminals 1 And 2
    G02383073Courtesy of NISSAN MOTOR CO., U.S.A.
  7. 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 8.
    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.
  8. CHECK DTC 

    Perform the self-diagnosis, after driving a vehicle for a while.

    OK or NG 

    1. OK: Inspection End.
    2. NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
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