Code No. P0004: Suction Control Valve Battery Short <Euro5>

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

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
The supply pump and injector are being normally controlled.
The fuel injection rate is 4 mm³/st or more.

Judgment Criterion

When the driving duty ratio of the suction control valve is lower than the specified value, the driving current is higher than the specified value.

PROBABLE CAUSES

Failed suction control valve
Short circuit 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?

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.

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

Q. Is the check result normal?

Go to Step 4.

Repair or replace the connector.

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 short circuit.

Q. Is the check result normal?

Go to Step 5.

Repair the damaged harness wire.

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 short 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, carry out the forcible DPF regeneration. (Refer to GROUP 17 - Emission Control - 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 ).