Code No. P0134: Right Bank Oxygen Sensor (front) Circuit No Activity Detected










OPERATION

  • Refer to Code No. P0131: Right bank oxygen sensor (front) circuit low voltage
  • Refer to Code No. P0201: No. 1 injector system
  • Refer to Code No. P0203: No. 3 injector system
  • Refer to Code No. P0205: No. 5 injector system

FUNCTION

  • The engine-ECU effects air/fuel ratio feedback control in accordance with the signals from the right bank oxygen sensor (front).
  • If the right bank oxygen sensor (front) has deteriorated, corrections will be made by the right bank 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
  • More than 20 seconds have passed since the engine starting sequence was completed.
  • Engine coolant temperature is more than 7°C.
  • Engine speed is more than 1,200 r/min.
  • Volumetric efficiency is more than 30 %.
  • Throttle position sensor output voltage is less than 4 V.
  • Except while fuel is being shut off.
  • Monitoring time: 30 seconds.
Judgment Criterion
  • Right bank oxygen sensor (front) output voltage does not get across lean/rich criteria (about 0.5 V) within about 30 seconds.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

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

  • Refer to Data List Reference Table .

    1. Item AC: Right bank 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: B-126 right bank oxygen sensor (front) connector

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

STEP 5. Check right bank oxygen sensor (front) itself.

  • Check right bank oxygen sensor (front) itself (Refer to ).

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

STEP 6. Connector check: B-44 intermediate connector

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

STEP 7. Perform resistance measurement at B-44 intermediate connector.

  1. Measure the resistance between terminal No. 6 and No. 7 when measuring No. 1 cylinder.
  2. Measure the resistance between terminal No. 6 and No. 8 when measuring No. 3 cylinder.
  3. Measure the resistance between terminal No. 6 and No. 9 when measuring No. 5 cylinder.
OK: 10.5 - 13.5 Ω (20°C)

Q. Are the check results normal?
Go to Step 10 .
Go to Step 8 .

STEP 8. Connector check: Injector connector

  • B-102 (No. 1 injector connector).
  • B-105 (No. 3 injector connector).
  • B-127 (No. 5 injector connector).

Q. Are the check results normal?
Go to Step 9 .
Repair or replace the connector.

STEP 9. Check No. 1, No. 3 and No. 5 injector itself.
Check No. 1, No. 3 and No. 5 injector itself (Refer to ).

Q. Are the check results normal?

    Check and repair harness between intermediate connector and injector connector.

    1. Check and repair harness between B-44 (terminal No. 7) intermediate connector and B-102 (terminal No. 2) No. 1 injector connector
    2. Check and repair harness between B-44 (terminal No. 8) intermediate connector and B-105 (terminal No. 2) No. 3 injector connector
    3. Check and repair harness between B-44 (terminal No. 9) intermediate connector and B-127 (terminal No. 2) No. 5 injector connector

      • Check output line for damage.
Replace the injector.

STEP 10. Connector check: B-29 engine-ECU connector

Q. Is the check result normal?
Go to Step 11 .
Repair or replace the connector.

STEP 11. Check harness between B-126 (terminal No. 4) right bank oxygen sensor (front) connector and B-29 (terminal No. 54) engine-ECU connector.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 12 .
Repair the damaged harness wire.

STEP 12. Check harness between intermediate connector and engine-ECU connector.



  1. Check and repair harness between B-44 (terminal No. 7) intermediate connector and B-29 (terminal No. 2) engine-ECU connector.
  2. Check and repair harness between B-44 (terminal No. 8) intermediate connector and B-29 (terminal No. 18) engine-ECU connector.
  3. Check and repair harness between B-44 (terminal No. 9) intermediate connector and B-29 (terminal No. 50) engine-ECU connector.

    • Check output line for damage.

Q. Are the check results normal?
Go to Step 13 .
Repair the damaged harness wire.

STEP 13. Fuel pressure measurement.

  • Fuel pressure measurement (Refer to Fuel Pressure Test ).

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