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

OPERATION

Refer to Code No. P0131: Oxygen Sensor (front) Circuit Low Voltage .
Refer to Code No. P0201: No. 1 Injector System .
Refer to Code No. P0202: No. 2 Injector System .
Refer to Code No. P0203: No. 3 Injector System .
Refer to Code No. P0204: No. 4 Injector System .

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.

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

Refer to Data List Reference Table .

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-45 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 (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-103 (No. 3 injector connector).
B-104 (No. 4 injector connector).

Q. Are the check results normal?

	Go to Step 7 .

	Repair or replace the connector.

STEP 7. Check injector itself.

Check injector itself (Refer to

Q. Is the check result normal?

	Go to Step 8 .

	Replace the injector.

STEP 8. Connector check: B-08 engine-ECU connector.

Q. Is the check result normal?

	Go to Step 9 .

	Repair or replace the connector.

STEP 9. Check harness between C-45 (terminal No. 3) oxygen sensor (front) connector and B-08 (terminal No. 38) engine-ECU connector.

note

Before checking harness, check intermediate connector A-11 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.

Check and repair harness between B-101 (terminal No. 2) No. 1 injector connector and B-08 (terminal No. 2) engine-ECU connector.
Check and repair harness between B-102 (terminal No. 2) No. 2 injector connector and B-08 (terminal No. 3) engine-ECU connector.
Check and repair harness between B-103 (terminal No. 2) No. 3 injector connector and B-08 (terminal No. 18) engine-ECU connector.
Check and repair harness between B-104 (terminal No. 2) No. 4 injector connector and B-08 (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 measurement (Refer to ).

Q. Is the check result normal?

	Replace the engine-ECU.

	Repair.

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