Posted in MMC L200

P0047 – Variable Geometry Control Solenoid Valve Circuit Low Input Vehicles with variable geometryturbocharger MMC L200 IV

 Posted by  Posted on September 28, 2020

OPERATION

  • Power is supplied to the variable geometry control solenoid valve (terminal No. 2) from the engine control relay (terminal No. 3).
  • The engine-ECU (terminal No. 17) makes the power transistor in the unit be in “ON” position, and that makes currents go on the variable geometry control solenoid valve (terminal No. 1).

    • FUNCTION

  • The variable geometry control solenoid valve controls the vacuum pressure introduced into the variable geometry actuator, using the signal from the engine-ECU. This allows the boost pressure to be adequate for the driving conditions.

    • TROUBLE JUDGEMENT

  • Battery positive voltage is 8 – 16 V.
  • 2 seconds later after the engine has started up.
  • Variable geometry control solenoid valve output voltage is 0.4 V or less (driving current is abnormally low).

    • PROBABLE CAUSES

  • Failed variable geometry control solenoid valve
  • Open/short circuit or harness damage in variable geometry control solenoid valve circuit or loose connector contact
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III actuator test

  • Item 36: Variable geometry control solenoid valve

    • Q. Is the check result normal?

    STEP 2. Connector check: A-56 variable geometry control solenoid valve connector

    Q. Is the check result normal?

    STEP 3. Perform resistance measurement at A-56 variable geometry control solenoid valve connector.

  • Disconnect connector, and measure at solenoid valve side.
  • Resistance between terminal No. 1 and No. 2.

    • Q. Is the check result normal?

    STEP 4. Perform voltage measurement at A-56 variable geometry control solenoid valve connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.

    • Q. Is the check result normal?

    STEP 5. Connector check: A-20X engine control relay connector

    Q. Is the check result normal?

  • Check power supply line open/short circuit

    • STEP 6. Perform voltage measurement at C-105 engine-ECU connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 17 and earth.

    • Q. Is the check result normal?

    STEP 7. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

  • Check output line for open/short circuit.

    • STEP 8. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 9. Check harness between A-56 (terminal No. 1) variable geometry control solenoid valve connector and C-105 (terminal No. 17) engine-ECU connector.

  • Check output line for damage.

    • Q. Is the check result normal?

    STEP 10. Check harness between A-56 (terminal No. 2) variable geometry control solenoid valve connector and A20X (terminal No. 3) engine control relay connector.

  • Check power supply line for damage.

    • Q. Is the check result normal?

    STEP 11. M.U.T.-III actuator test

  • Item 36: Variable geometry control solenoid valve

    • Q. Is the check result normal?

    Author: admin