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Home › Infiniti › 2010 › M45 Base › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS P1550 To P2A03 › DTC P1800 VIAS Control Solenoid Valve › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
      • Vehicle Front
    2. Disconnect VIAS control solenoid (1) valve harness connector.
      Fig 1: Identifying VIAS Control Solenoid Valve Harness Connector
      G06303401Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between terminal 1 and ground with CONSULT-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  3.

    NG: GO TO 2.

    Fig 2: Checking Voltage Between Terminal 1 And Ground
    G04897281Courtesy of NISSAN MOTOR CO., U.S.A.
  2. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E12, F3
    • Harness for open or short between VIAS control solenoid valve and IPDM E/R

    Repair or replace harness or connectors.

  3. 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 SYSTEM WIRING DIAGRAMS article.

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 4.

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

  4. CHECK VIAS CONTROL SOLENOID VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 5.

    NG: Replace VIAS control solenoid valve.

  5. CHECK INTERMITTENT INCIDENT

    Refer to "DIAGNOSIS PROCEDURE ".

    INSPECTION END 

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