Code No. P0628: Suction Control Valve Open










OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment Criterion

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Connector check: B-129 suction control valve connector


Q. Is the check result normal?

Go to Step 2 .
Repair or replace the connector.

STEP 2. Check suction control valve itself.



  • Check suction control valve itself (Refer to ).

Q. Is the check result normal?

Go to Step 3 .
Replace the suction control valve. After replacing the suction control valve, learn the supply pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 3. Perform voltage measurement at B-129 suction control valve connector.



  • Disconnect connector, and measurement at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 7 .
Go to Step 4 .

STEP 4. Connector check: D-213 engine-ECU connector.


Q. Is the check result normal?

Go to Step 5 .
Repair or replace the connector.

STEP 5. Check harness between D-213 (terminal No. 17) engine-ECU connector and B-129 (terminal No. 1) suction control valve connector.



  • Check power supply line for open circuit.

Q. Is the check result normal?

Go to Step 6 .
Repair the damaged harness wire.

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



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ). After registering the injector identification code, the vehicle equipped with the DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 7. Connector check: D-213 engine-ECU connector.


Q. Is the check result normal?

Go to Step 8 .
Repair or replace the connector.

STEP 8. Check harness between D-213 (terminal No. 37) engine-ECU connector and B-129 (terminal No. 2) suction control valve connector.



  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

Go to Step 9 .
Repair the damaged harness wire.

STEP 9. Check harness between D-213 (terminal No. 17) engine-ECU connector and B-129 (terminal No. 1) suction control valve connector.



  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 10 .
Repair the damaged harness wire.

STEP 10. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ). After registering the injector identification code, the vehicle equipped with the DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).





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