Posted in Mitsubishi Colt

P0443 – Purge Control Solenoid Valve System MMC Colt

 Posted by  Posted on September 26, 2020

OPERATION

  • Power is supplied to the purge control solenoid valve (terminal No. 2) from the engine control relay (terminal No. 4).
  • The engine-ECU (terminal No. 38) makes the power transistor in the unit be in “ON” position, and that makes currents go on the purge control solenoid valve (terminal No. 1).

    • FUNCTION

  • In response to a signal from the engine-ECU, the purge control solenoid valve controls the flow rate of the purge air to be introduced into the surge tank.

    • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position.
  • Battery positive voltage is 10 V or higher.
  • The surge voltage of solenoid coil is not detected when the purge control solenoid valve is turned in OFF position from ON.

    • PROBABLE CAUSES

  • Failed purge control solenoid valve
  • Open or shorted purge control solenoid valve circuit, harness damage, or connector damage
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

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

  • Item No. 6: Purge control solenoid valve

    • Q. Is the check result normal?

    STEP 2. Connector check: A-107 purge control solenoid valve connector

    Q. Is the check result normal?

    STEP 3. Perform resistance measurement at A-107 purge 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-107 purge 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: B-206 engine control relay connector

    Q. Is the check result normal?

  • Check power supply line for open/short circuit.

    • STEP 6. Perform voltage measurement at A-08 engine-ECU connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 38 and earth.

    • Q. Is the check result normal?

    STEP 7. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

  • Check earthing line for open/short circuit.

    • STEP 8. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 9. Check harness between A-107 (terminal No. 1) purge control solenoid valve connector and A-08 (terminal No. 38) engine-ECU connector.

  • Check earthing line for damage.

    • Q. Is the check result normal?

    STEP 10. Check harness between A-107 (terminal No. 2) purge control solenoid valve connector and B-206 (terminal No. 4) 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 No. 6: Purge control solenoid valve

    • Q. Is the check result normal?

    Author: admin