Code No. P0134: Oxygen Sensor (front) Circuit No Activity Detected <Vehicles for Russia>


OPERATION



  • Check code No. P0131: oxygen sensor (front) circuit low voltage (Refer to ).
  • Check code No. P0201: No. 1 injector system (Refer to ).
  • Check code No. P0202: No. 2 injector system (Refer to ).
  • Check code No. P0203: No. 3 injector system (Refer to ).
  • Check code No. P0204: No. 4 injector system (Refer to ).

FUNCTION



  • The engine-ECU effects air/fuel ratio feedback control in accordance with the signals from the oxygen sensor (front).
  • If the oxygen sensor (front) has deteriorated, corrections will be made by the oxygen sensor (rear).
  • Code No. P0134 becomes stored in memory if a failure is detected in the above air/fuel ratio feedback control system.

TROUBLE JUDGMENT


Check Conditions
  • Typically 30 seconds have passed since the engine starting sequence was completed.
  • Engine coolant temperature is more than 82°C.
  • Engine speed is more than 1,188 r/min.
  • Manifold absolute pressure is more than 24 kPa.
  • Except while fuel is being shut off.
  • Monitoring time: 30 seconds.
Judgement Criterion
  • Oxygen sensor (front) output voltage does not get across lean/rich criteria (about 0.5 V) within about 30 seconds.

FAIL-SAFE AND BACKUP FUNCTION



  • None

PROBABLE CAUSES



  • Failed oxygen sensor (front)
  • Harness damage in oxygen sensor (front) circuit
  • Failed injector
  • Harness damage in injector circuit
  • Exhaust leak
  • Air drawn in from gaps in gasket, seal, etc.
  • Incorrect fuel pressure
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

  • Data list reference table (Refer to ).

  1. Item AC: Oxygen sensor (front)

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. Check for exhaust leaks.

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

STEP 3. Check for intake system vacuum leak.

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

STEP 4. Connector check: C-21 oxygen sensor (front) connector

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector.

STEP 5. Check oxygen sensor (front) itself.

  • Oxygen sensor check (Refer to ).

Q. Is the check result normal?
Go to Step 6.
Replace the oxygen sensor (front).

STEP 6. Connector check: Injector connectors.



  • B-101 (No. 1 injector connector).
  • B-102 (No. 2 injector connector).
  • B-105 (No. 3 injector connector).
  • B-106 (No. 4 injector connector).

Q. Are the check results normal?
Go to Step 7.
Repair or replace the connector.

STEP 7. Check injector itself.

  • Injector check (Refer to ).

Q. Is the check result normal?
Go to Step 8.
Replace the injector.

STEP 8. Connector check: B-26 engine-ECU connector.

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

STEP 9. Check harness between C-21 (terminal No. 3) oxygen sensor (front) connector and B-26 (terminal No. 38) engine-ECU connector.
note Before checking harness, check intermediate connector A-17, and repair if necessary.

  • Check output line for damage.

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

STEP 10. Check harness between injector connector and engine-ECU connector.

  1. Check and repair harness between B-101 (terminal No. 2) No. 1 injector connector and B-26 (terminal No. 2) engine-ECU connector.
  2. Check and repair harness between B-102 (terminal No. 2) No. 2 injector connector and B-26 (terminal No. 3) engine-ECU connector.
  3. Check and repair harness between B-105 (terminal No. 2) No. 3 injector connector and B-26 (terminal No. 18) engine-ECU connector.
  4. Check and repair harness between B-106 (terminal No. 2) No. 4 injector connector and B-26 (terminal No. 19) engine-ECU connector.

  • Check output line for damage.

Q. Are the check result normal?
Go to Step 11.
Repair the damaged harness wire.

STEP 11. Fuel pressure measurement.

  • Fuel pressure test (Refer to ).

Q. Is the check result normal?
Replace the engine-ECU.
Repair.