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Home >> Nissan-Datsun >> 2012 >> Xterra PRO-4X, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> VIAS >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK OVERALL FUNCTION

    With CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
    3. Turn VIAS control solenoid valve "ON" and "OFF", and make sure that power valve actuator rod moves.
    Fig 1: Identifying Power Valve Actuator
    G08201409Courtesy of NISSAN NORTH AMERICA, INC.

    Without CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Rev engine up to between 2, 200 and 3, 300 RPM and make sure that power valve actuator rod moves.
    Fig 2: Identifying Power Valve Actuator
    G08201410Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: INSPECTION END 

    NG (With CONSULT): GO TO 2.

    NG (Without CONSULT): GO TO  3.

  2. CHECK VACUUM EXISTENCE

    With CONSULT 

    1. Stop engine and disconnect vacuum hose connected to power valve actuator.
    2. Start engine and let it idle.
    3. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
    4. Turn VIAS control solenoid valve "ON" and "OFF", and check vacuum existence under the following conditions.
    VIAS SOL VALVE Vacuum
    ON Should exist.
    OFF Should not exist.

    OK or NG 

    OK: Repair or replace power valve actuator.

    NG: GO TO  4.

  3. CHECK VACUUM EXISTENCE

    Without CONSULT 

    1. Stop engine and disconnect vacuum hose connected to power valve actuator.
    2. Disconnect VIAS control solenoid valve harness connector.
    3. Start engine and let it idle.
    4. Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.
    5. Check vacuum existence under the following conditions.
    Condition Vacuum
    12V direct current supply Should exist.
    No supply Should not exist.
    Fig 3: Applying 12V Of Direct Current Between VIAS Control Solenoid Valve Terminals
    G04897447Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: Repair or replace power valve actuator.

    NG: GO TO 4.

  4. CHECK VACUUM HOSE
    1. Stop engine.
    2. Check hoses and tubes between intake manifold and power valve actuator for cracks, clogging, improper connection or disconnection. Refer to "VACUUM HOSE DRAWING ".

    OK or NG 

    OK: GO TO 5.

    NG: Repair hoses or tubes.

    Fig 4: Checking Hoses And Tubes For Clogging
    G04897448Courtesy of NISSAN NORTH AMERICA, INC.
  5. CHECK VACUUM TANK

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace vacuum tank. Refer to "EXPLODED VIEW ".

  6. CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect VIAS control solenoid valve harness connector.
      Fig 5: Identifying Power Valve Actuator And VIAS Control Solenoid Valve
      G08201413Courtesy of NISSAN NORTH AMERICA, INC.
    3. Turn ignition switch ON.
    4. Check voltage between terminal 1 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    Fig 6: Checking Voltage Between Terminal 1 And Ground
    G04897281Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • Harness for open or short between VIAS control solenoid valve and IPDM E/R
    • Harness for open or short between VIAS control solenoid valve and ECM

    : Repair harness or connectors.

  8. CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.

      Refer to WIRING DIAGRAM Wiring Diagram.

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO 9.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK VIAS CONTROL SOLENOID VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Replace VIAS control solenoid valve. Refer to "EXPLODED VIEW ".

  10. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END 

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