Sfi System - P0134(2008/08 - 2011/05)

1. Description

2. Wiring diagram

3. Confirmation driving pattern

4. Inspection procedure

5. Check any other dtcs output (in addition to dtc p0134)

6. Read value using intelligent tester (output voltage of heated oxygen sensor)

7. Check pcv hose connections

8. Inspect heated oxygen sensor (heater resistance)

9. Inspect integration no.1 relay (efi relay)

10. Check harness and connector (heated oxygen sensor - ecm)

11. Check whether misfire occurs by monitoring dtc and data list

12. Check air induction system

13. Check fuel pressure

14. Inspect fuel injector

15. Check for exhaust gas leak

16. Perform confirmation driving pattern

17. Check whether dtc output recurs (dtc p0134)

18. Confirm if vehicle has run out of fuel in past

DTC P0134 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

HINT:

Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.

DESCRIPTION

HINT:

If this DTC is set, check the output voltage of the HO2 sensor (sensor 1) by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / O2S B1S1.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

HINT:

This confirmation driving pattern is used in the "PERFORM CONFIRMATION DRIVING PATTERN" procedure of the following diagnostic troubleshooting procedure.

1. (1) Connect an intelligent tester to the DLC3.
   
2. (2) Turn the ignition switch to ON and turn the tester on.
   
3. (3) Clear DTCs (Click here).
   
4. (4) Start the engine.
   
5. (5) Allow the engine to idle until the engine coolant temperature reaches 40°C (104°F).
   
6. (6) Drive the vehicle at a speed of more than 40 km/h (25 mph) for 3 minutes or more.
   

NOTICE:

If the conditions in this test are not strictly followed, malfunctions may not be detected.

INSPECTION PROCEDURE

HINT:

It is possible that the malfunctioning area can be found using the Active Test Control operation. The Active Test can determine if the heated oxygen sensor or other potential trouble areas are malfunctioning or not.

The injection volume can be switched to -12.5% (decrease) or +25% (increase) by the Active Test.

The Active Test procedure enables a technician to check and graph the voltage outputs of the heated oxygen sensors.

1. Procedure:
   
2. 1. Connect an intelligent tester to the DLC3.
      
   2. Turn the ignition switch to ON.
      
   3. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
      
   4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
      
   5. Perform the Active Test while the engine is idling.
      

Standard:

The heated oxygen sensor reacts in accordance with the increases and decreases in injection volume:
+25% → RICH output: More than 0.5 V
-12.5% → LEAN output: Less than 0.4 V

NOTICE:

The heated oxygen sensor (sensor 1) has an output delay of a few seconds and the heated oxygen sensor (sensor 2) has a maximum output delay of 20 seconds.

If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and the DTCs are recorded.

Case	Heated Oxygen Sensor (Sensor 1) Output Voltage	Heated Oxygen Sensor (Sensor 2) Output Voltage	Main Suspected Trouble Area
1			-
2			Heated oxygen sensor (Sensor 1) Heated oxygen sensor heater (Sensor 1) Heated oxygen sensor circuit (Sensor 1)
3			Heated oxygen sensor (Sensor 2) Heated oxygen sensor heater (Sensor 2) Heated oxygen sensor circuit (Sensor 2)
4			Injector Fuel pressure Gas leak from exhaust system (Air-fuel ratio extremely RICH or LEAN)

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.

1. Connect an intelligent tester to the DLC3.

2. Turn the ignition switch to ON and turn the tester on.

3. Select the following menu items: Powertrain / Engine and ECT / DTC.

4. Read DTCs.

   Result:

   Display (DTC Output)	Proceed To
   P0134	A
   P0134 and other DTCs	B

HINT:

If any DTCs other than P0134 are output, troubleshoot those DTCs first.

B	GO TO DTC CHART (Click here)

A

1. Connect an intelligent tester to the DLC3.

2. Turn the ignition switch to ON and turn the tester on.

3. Start the engine.

4. Select the following menu items: Powertrain / Engine and ECT / Data List / O2S B1S1 and Engine Speed.

5. Warm up the engine until the engine coolant temperature reaches more than 40°C (104°F).

6. Rev the engine up to 4,000 rpm 3 times using the accelerator pedal.

7. Read the output voltage of the front Heated Oxygen (HO2) sensor displayed on the tester when the engine speed is suddenly increased.

   Standard:

   HO2 sensor voltage output indicates 0.45 V or more (rich signal) at least once.
   

OK	Go to step 12

NG

OK:

PCV hose is connected correctly and is not damaged.

NG	REPAIR OR REPLACE PCV HOSE

OK

1. Disconnect the C36 HO2 sensor (sensor 1) connector.

2. Check the resistance.

   Standard resistance:

   Tester Connections	Specified Conditions
   HT1A (1) - +B (2)	5.3 to 7.5 Ω at 20 °C (68°F)
   HT1A (1) - E2 (4)	10 kΩ or higher

3. Reconnect the HO2 sensor connector.

NG	REPLACE HEATED OXYGEN SENSOR (Click here)

OK

1. Remove the integration relay from the engine room relay block.

2. Inspect the EFI fuse.

   1. Remove the EFI fuse from the integration relay.

   2. Check the EFI fuse resistance.

      Standard resistance:

      Below 1 Ω
      

   3. Reinstall the EFI fuse.

3. Inspect the EFI relay.

   1. Check the EFI relay resistance.

      Standard resistance:

      Tester Connections	Specified Conditions
      1C-1 - 1A-4	10 kΩ or higher
      	Below 1 Ω (Apply battery voltage between terminals 1A-2 and 1A-3)

4. Reinstall the integration relay.

NG	REPLACE INTEGRATION NO.1 RELAY

OK

1. Disconnect the C36 HO2 sensor (sensor 1) connector.

2. Disconnect the C20 ECM connector.

3. Check the resistance.

   Standard resistance (Check for open):

   Tester Connections	Specified Conditions
   OX1A (C36-3) - OX1A (C20-112)	Below 1 Ω
   HT1A (C36-1) - HT1A (C20-109)

   Standard resistance (Check for short):

   Tester Connections	Specified Conditions
   OX1A (C36-3) or OX1A (C20-112) - Body ground	10 kΩ or higher
   HT1A (C36-1) or HT1A (C20-109) - Body ground

4. Reconnect the HO2 sensor connector.

5. Reconnect the ECM connector.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

NG	TROUBLESHOOT MISFIRE

OK

1. Check the air induction system for vacuum leaks.

   OK:

   No leakage from air induction system.
   

NG	REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK

1. Check the fuel pressure (Click here).

NG	REPAIR OR REPLACE FUEL SYSTEM

OK

1. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor).

NG	REPLACE FUEL INJECTOR (Click here)

OK

OK:

No gas leakage.

NG	REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT

OK
REPLACE HEATED OXYGEN SENSOR (Click here)

HINT:

Clear all DTCs before performing the confirmation driving pattern.

NEXT

1. Connect an intelligent tester to the DLC3.

2. Turn the ignition switch to ON and turn the tester on.

3. Select the following menu items: Powertrain / Engine and ECT / DTC.

4. Read DTCs.

   Result:

   Display (DTC Output)	Proceed To
   No output	A
   P0134	B

B	REPLACE ECM (Click here)

A

1. If the vehicle has run out of fuel, proceed to A.

2. If the vehicle has not run out of fuel, proceed to B.

B	CHECK FOR INTERMITTENT PROBLEMS (Click here)

A
DTC CAUSED BY RUNNING OUT OF FUEL