P0628 – Suction Control Valve Open Except Euro5b MMC L200 IV



OPERATION

  • The voltage is applied from the engine-ECU (terminal No. 131) to the suction control valve (terminal No. 1) via the power transistor in the engine-ECU.
  • The voltage is earthed to the engine-ECU (terminal No. 146) from the suction control valve (terminal No. 2).

  • FUNCTION

  • The engine-ECU performs duty control over the suction control valve.
  • The engine-ECU checks whether the amount of current for driving duty is adequate.

  • TROUBLE JUDGMENT

  • Battery positive voltage is 8 – 16 V
  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up.
  • The supply pump and injector are being normally controlled.
  • The fuel injection rate is 4 mm3/st or more.
  • When the driving duty ratio of the suction control valve is higher than the specified value, the driving current is lower than the specified value.

  • PROBABLE CAUSES

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

  • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-47 suction control valve connector

    Q. Is the check result normal?

    STEP 2. Check suction control valve itself.

    Q. Is the check result normal?

    STEP 3. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 4. Check harness between C-103 (terminal No. 131) engine-ECU connector and A-47 (terminal No. 1) suction control valve connector.

  • Check power supply line for open/short circuit and damage.
  • Q. Is the check result normal?

    STEP 5. Check harness between C-103 (terminal No. 146) engine-ECU connector and A-47 (terminal No. 2) suction control valve connector.

  • Check earthing line for open/short circuit and damage.
  • Q. Is the check result normal?

    STEP 6. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.
  • Q. Is the diagnosis code set?

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