Code No. P0202: No. 2 Injector System










OPERATION



  • Power is supplied to the injector (terminal No. 1) from the engine control relay (terminal No. 1).
  • The engine-A/T-ECU (terminal No. 5) makes the power transistor in the unit be in ON position, and that makes currents go on the injector (terminal No. 2).

FUNCTION



  • The engine-A/T-ECU controls the power supply interval of the injector.
  • The fuel injection amount of the injector depends on the power supply interval.

TROUBLE JUDGMENT


Check Condition
  • While engine is running.
Judgment Criterion
  • Injector coil surge voltage (system voltage +2 V) is not detected for 2 seconds.

PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

  • Item 02: No. 2 injector
OK: Idling state varies.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2 .

STEP 2. Connector check: B-111 No. 2 injector connector

Q. Is the check result normal?
Go to Step 3 .
Repair or replace the connector.

STEP 3. Check No. 2 injector itself.

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

Q. Is the check result normal?
Go to Step 4 .
Replace the No. 2 injector.

STEP 4. Perform voltage measurement at B-111 No. 2 injector connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 6 .
Go to Step 5 .

STEP 5. Connector check: B-15X engine control relay connector

Q. Is the check result normal?

    Check intermediate connector B-06, and repair if necessary. If intermediate connector is normal, check and repair harness between B-15X (terminal No. 1) engine control relay connector and B-111 (terminal No. 1) No. 2 injector connector.

    • Check power supply line for open/short circuit.
Repair or replace the connector.

STEP 6. Connector check: B-15X engine control relay connector

Q. Is the check result normal?
Go to Step 7 .
Repair or replace the connector.

STEP 7. Check harness between B-15X (terminal No. 1) engine control relay connector and B-111 (terminal No. 1) No. 2 injector connector.
note Before checking harness, check intermediate connector B-06, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 8. Connector check: D-212 engine-A/T-ECU connector

Q. Is the check result normal?
Go to Step 9 .
Repair or replace the connector.

STEP 9. Check harness between B-111 (terminal No. 2) No. 2 injector connector and D-212 (terminal No. 5) engine-A/T-ECU connector.
note Before checking harness, check intermediate connector B-06, and repair if necessary.

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

Q. Is the check result normal?
Go to Step 10 .
Repair the damaged harness wire.

STEP 10. Perform signal wave pattern measurement at D-212 engine-A/T-ECU connector (Using an oscilloscope).

  • Engine: Idling
  • Transmission: P range
  • Voltage between terminal No. 5 and earth.
OK: Waveforms should be display on Inspection procedure using an oscilloscope (Refer to ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-A/T-ECU.