Posted in MMC L200

P0048 – Variable Geometry Control Solenoid Valve | 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 JUDGMENT

  • Battery positive voltage is 8 – 16 V.
  • 2 seconds later after the engine has started up.
  • Variable geometry control solenoid valve output voltage is 4.5 V or more (driving current is abnormally high).

    • PROBABLE CAUSES

  • Short circuit in variable geometry control solenoid valve circuit or loose connector contact
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-56 variable geometry control solenoid valve connector, C-105 engine-ECU connector

    Q. Are the check results normal?

    STEP 2. 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 short circuit.

    • Q. Is the check result normal?

    STEP 3. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

    • Q. Is diagnosis code set?

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