Code No. P0202: No. 2 Injector Circuit Malfunction




OPERATION



  • Driving power is supplied from the engine-ECU (terminal No. 2) to the No. 2 injector (terminal No. 1).
  • The engine-ECU (terminal No. 5 and No. 6) turn on the power transistor to flow current to the No. 2 injector (terminal No. 2).

FUNCTION



  • The engine-ECU monitors peak current during injector drive control to detect disconnection in the injector No. 2 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. 2 injector circuit is not detected, the circuit is judged to be open.

PROBABLE CAUSES



  • Failed No. 2 injector
  • Open/short circuit in No. 2 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-41 No. 2 injector connector

Q. Is the check result normal?

Go to Step 2 .

Repair or replace the connector.

STEP 2. Check No. 2 injector itself.

  • Check No. 2 injector itself (Refer to ).

Q. Is the check result normal?
Go to Step 3 .
Replace the No. 2 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. 2 injector connector and engine-ECU connector.



  1. Check the harness between A-41 (terminal No. 2) No. 2 injector connector and C-105 (terminal No. 5) engine-ECU connector.
  2. Check the harness between A-41 (terminal No. 2) No. 2 injector connector and C-105 (terminal No. 6) 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-41 (terminal No. 1) No. 2 injector connector and C-105 (terminal No. 2) 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. 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 ).