Code No. P0089: Suction Control Valve Stuck


OPERATION



  • Battery power is supplied from the engine-ECU (terminal No. 17) to the suction control valve (terminal No. 1).
  • The engine-ECU (terminal No. 37) turns on the power transistor to flow current to the suction control valve (terminal No. 2).

FUNCTION



  • The engine-ECU monitors the signals input from the rail pressure sensor.
  • The engine-ECU monitors the difference between the target fuel pressure and actual fuel pressure to check whether the suction control valve is open or fixed.

TROUBLE JUDGMENT


Check Conditions
  • 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
Judgment Criterion
  • The actual rail pressure remains higher than the objective rail pressure by 10 MPa or more for a certain interval.

PROBABLE CAUSES



  • Failed suction control valve
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

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

  • Refer to Actuator Test Table .

  1. Item 19: Suction control valve

Q. Is the check result normal?
Go to Step 2 .
Go to Step 4 .

STEP 2. Make a check on the following items.

  • Check for foreign matters (water, kerosene, etc.) in fuel and replace if necessary.
  • Check fuel filter itself.

Q. Are the check results normal?
Go to Step 3 .
Make a repair or replacement for items whose checking results are abnormal.

STEP 3. 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 - 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 ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 4. Replace the supply pump assembly.

  • After the supply pump assembly, learn the supply pump. (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).
  • After learning the supply pump assembly, re-check the trouble symptoms

Q. Does trouble symptom persist?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - 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 ).
The check is end.