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 20 seconds have passed since the engine starting sequence was completed.
  • Engine coolant temperature is more than 7°C.
  • Engine speed is more than 1,188 r/min.
  • Volumetric efficiency is more than 30 %.
  • 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.