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 fuel system
Failed engine-ECU

DIAGNOSTIC PROCEDURE

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

Refer to Actuator Test Table .

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 - 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 ).

	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 - 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 ).

	The check is end.