Code No. P0201: No. 1 Injector Circuit Malfunction

OPERATION

Driving power is supplied from the engine-ECU (terminal No. 1) to the No. 1 injector (terminal No. 2).
The engine-ECU (terminal No. 2) turn on the power transistor to flow current to the No. 1 injector (terminal No. 1).

FUNCTION

The engine-ECU monitors peak current during injector drive control to detect disconnection in the injector No. 1 circuit.

TROUBLE JUDGMENT

Check Conditions

Ignition switch is in ON position
Battery positive voltage is 8 V or more.
Except during the engine cranking period
When an engine-ECU internal capacitor is allowed to be charged

Judgment Criterion

When the peak current of the No. 1 injector circuit is not detected, the circuit is judged to be open.

PROBABLE CAUSES

Failed No. 1 injector
Open/short circuit or harness damage in No. 1 injector circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

caution

A high-tension voltage is flowing between the engine-ECU and the injectors while the engine is running. Handle them carefully to avoid receiving electric shocks from the voltage.

STEP 1. Connector check: A-42 No. 1 injector connector

Q. Is the check result normal?

Go to Step 2 .

Repair or replace the connector.

STEP 2. Check No. 1 injector itself.

Check No. 1 injector itself (Refer to ).

Q. Is the check result normal?

	Go to Step 3 .

	Replace the No. 1 injector. After replacing the Injector, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 3. Check harness between No. 1 injector connector and engine-ECU connector.

Check harness between A-42 (terminal No. 1) No. 1 injector connector and C-105 (terminal No. 2) engine-ECU connector.

Check earthing line for open/short circuit and damage.

Q. Are the check results normal?

Go to Step 4 .

Repair the damaged harness wire.

STEP 4. Check harness between A-42 (terminal No. 2) No. 1 injector connector and C-105 (terminal No. 1) engine-ECU connector.

Check power supply line for open/short circuit and damage.

Q. Is the check result normal?

Go to Step 5 .

Repair or replace the connector.

STEP 5. Connector check: C-105 engine-ECU connector

Q. Is the check result normal?

Go to Step 6 .

Repair or replace the connector.

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

Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

	Replace the engine-ECU. 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 ).