Code No. P0202: No. 2 Injector Circuit Malfunction <Euro5b>








OPERATION



  • Driving power is supplied from the engine-ECU (terminal No. 73) to the No. 2 injector (terminal No. 1).
  • The engine-ECU (terminal No. 75) 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 No. 2 injector 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 injector circuit is not detected, the circuit is judged to be open.

PROBABLE CAUSES



  • Failed No. 2 injector
  • Open/short circuit or harness damage in No. 2 injector circuit or loose connector contact
  • Failed engine-ECU

DIAGNOSTIC 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: B-111 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 B-111 (terminal No. 2) No. 2 injector connector and D-213 (terminal No. 75) engine-ECU connector.

  • Check earthing line for open/short circuit and damage.

Q. Is the check result normal?
Go to Step 4.
Repair the damaged harness wire.

STEP 4. Check harness between B-111 (terminal No. 1) No. 2 injector connector and D-213 (terminal No. 73) 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: D-213 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 - 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, the vehicle equipped with the closed type DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - 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 ).