Code No. P2151: Injector Common 2 (Cylinder No. 2 and No. 3) Circuit Battery Short


OPERATION



  • Refer to Code No. P0202: No. 2 Injector Circuit Malfunction
  • Refer to Code No. P0203: No. 3 Injector Circuit Malfunction

FUNCTION



  • The engine-ECU monitors voltage application to the injector during no injector energisation to detect errors in the No. 2 and No. 3 injector drive circuit.

TROUBLE JUDGMENT


Check Condition
  • Ignition switch is in "ON" position.
Judgment Criterion
  • Short-circuit to the battery is detected in the injector drive circuit.

FAIL-SAFE AND BACKUP FUNCTION



  • The engine is stopped (The fuel injection and pump pressure feed are stopped).
  • The throttle valve is opened (Electrical discontinuity).
  • The EGR control is stopped (fully closed).
  • The DPF regeneration is prohibited.
  • The AS&G control is prohibited.

PROBABLE CAUSES



  • Short circuit in injector circuit or loose connector contact
  • Failed No. 2 injector
  • Failed No. 3 injector
  • Failed engine-ECU

DIAGNOSIS PROCEDURE
warning 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. Check harness between engine-ECU connector terminal INJ2 and No. 2 injector connector terminal.

  • Check earthing line for short circuit.

Q. Is the check result normal?
Go to Step 2.
Repair or replace the connector, or repair the damaged harness wire.

STEP 2. Check harness between engine-ECU connector terminal INJ3 and No. 3 injector connector terminal.

  • Check earthing line for short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 3. Check harness between engine-ECU connector terminal I/B2 and No. 2 injector connector terminal.

  • Check power supply line for short circuit.

Q. Is the check result normal?
Go to Step 4.
Repair or replace the connector, or repair the damaged harness wire.

STEP 4. Check harness between engine-ECU connector terminal I/B3 and No. 3 injector connector terminal.

  • Check power supply line for short circuit.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 5. Check Injector itself

  • No. 2 injector connector and No. 3 injector connector check.
  • Check No. 2 injector and No. 3 injector itself (Refer to ).

Q. Is the check result normal?
Go to Step 6.
Repair or replace the connector, or replace the injector.

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

  • After erasing the diagnosis code through M.U.T.-III, start the engine and confirm whether the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).