SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P0130

DTC Code	DTC Name
P0130	Oxygen (A/F) Sensor Circuit (Bank 1 Sensor 1)

DESCRIPTION

To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.

The heated oxygen sensor has the characteristic where by its output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and provide the ECM with feedback to control the air-fuel ratio.

When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust gas increases. And the heated oxygen sensor informs the ECM of the LEAN condition (small electromotive force: <0.45 V).

When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio, the oxygen concentration in the exhaust gas is reduced. And the heated oxygen sensor informs the ECM of the RICH condition (large electromotive force: >0.45 V). The ECM judges by the electromotive force from the heated oxygen sensor whether the air-fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if the malfunction of the heated oxygen sensor causes an output of abnormal electromotive force, the ECM becomes unable to perform the accurate air-fuel ratio control.

The heated oxygen sensor is included a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the heater in order to heat the sensor for the accurate oxygen concentration detection.

DTC No.	DTC Detecting Condition	Trouble Area
P0130	After engine is warmed up, heated oxygen sensor output does not indicate RICH (more than 0.45 V) even once when condition (a), (b), (c) and (d) continue for at least 15 seconds: Engine speed: 1,000 rpm or more Vehicle speed: 40 to 100 km/h (25 to 62 mph) Throttle valve is not fully closed 80 seconds or more after starting engine	Open or short in heated oxygen sensor circuit PCV hose Air induction system Fuel pressure Heated oxygen sensor Fuel injector Gas leakage in exhaust system ECM

Tech Tips

After confirming DTC P0130, use the intelligent tester to confirm the output voltage of the heated oxygen sensor from the "Powertrain / Engine and ECT / Data List". If voltage output of the heated oxygen sensor is less than 0.1 V, the heated oxygen sensor circuit may be open or short.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

(1) Connect the intelligent tester to the DLC3.

(2) Switch the intelligent tester from the normal mode to the check mode.

(3) Start the engine and let the engine idle for 60 seconds or more.

(4) Drive the vehicle at 40 km/h (25 mph) or more for 40 seconds or more.

(5) Let the engine idle for 10 seconds or more.

(6) Perform steps (4) and (5) 12 times.

Tech Tips

If a malfunction exists, the MIL will light up during step (6).

Note

If the conditions in this test are not strictly followed, detection of the malfunction will not be possible. If you do have an intelligent tester, turn the ignition switch OFF after performing steps from (3) to (6), then perform steps from (3) to (6) again.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
If different DTCs that are related to different systems are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may be open.

PROCEDURE

CHECK OTHER DTC OUTPUT (BESIDES P0130)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the tester ON.
Select the following menu items: Powertrain / Engine and ECT / DTC.

Read DTCs.

Result

Display (DTC Output)	Proceed To
P0130	A
Other DTCs are output besides P0130	B

Tech Tips

If any other codes besides P0130 is output, perform the troubleshooting on that DTC first.

GO TO DTC CHART

READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
1. Warm up the engine to the normal operating temperature above 75°C (169°F).
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to the ON position and turn the tester ON.
4. Select the following menu items: Powertrain / Engine and ECT / Data List / O2S B1S2.
5. Allow the engine to idle.
6. Read the Heated Oxygen (HO2) sensor output voltage when the engine is suddenly raced.
  
  Standard
  
  Heated oxygen sensor outputs a RICH signal (0.45 V or more) at least once
  
  Tech Tips
  
  Perform a quick racing to 4,000 rpm 3 times by using the accelerator pedal.
OK
PERFORM CONFIRMATION DRIVING PATTERN Click here

NG
CHECK PCV HOSE

NG
REPAIR OR REPLACE PCV HOSE

OK
INSPECT HEATED OXYGEN SENSOR

NG
REPLACE HEATED OXYGEN SENSOR

OK

Standard
Heated oxygen sensor outputs a RICH signal (0.45 V or more) at least once

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

Disconnect the D34 HO2 sensor connector.
Turn the ignition switch to the ON position.

Measure the voltage between the +B terminal of the HO2 sensor connector and body ground.

Voltage

Tester Connections	Specified Conditions
+B (D34-2) - Body ground	9 to 14 V

Turn the ignition switch to OFF.
Disconnect the D1 ECM connector.

Measure the resistance.

Resistance (Check for open)

Tester Connections	Specified Conditions
HT1A (D34-1) - HT1A (D1-1)	Below 1 Ω
OX1A (D34-3) - OX1A (D1-21)	Below 1 Ω
E2 (D34-4) - E2 (D1-28)	Below 1 Ω

Resistance (Check for short)

Tester Connections	Specified Conditions
HT1A (D34-1) or HT1A (D1-1) - Body ground	10 kΩ or higher
OX1A (D34-3) or OX1A (D1-21) - Body ground	10 kΩ or higher
E2 (D34-4) or E2 (D1-28) - Body ground	10 kΩ or higher

Reconnect the HO2 sensor connector.
Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK WHETHER MISFIRE IS OCCURRED OR NOT BY MONITORING DTC AND DATA LIST

NG
CHECK FOR SPARK AND IGNITION

OK
CHECK AIR INDUCTION SYSTEM

NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK
CHECK FUEL PRESSURE

NG
REPAIR OR REPLACE FUEL SYSTEM

OK
INSPECT FUEL INJECTOR ASSEMBLY (INJECTION VOLUME)

NG
REPLACE FUEL INJECTION ASSEMBLY

OK
CHECK FOR EXHAUST GAS LEAKS

NG
REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT

OK

REPLACE HEATED OXYGEN SENSOR
PERFORM CONFIRMATION DRIVING PATTERN
1. Clear the DTC.
2. Warm up the heated oxygen sensor by performing a driving test to check the system.
  
  Tech Tips
  
  Refer to CONFIRMATION DRIVING PATTERN.
NEXT

READ OUTPUT DTC (DTC P0130 IS OUTPUT AGAIN)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the tester ON.
Select the following menu items: Powertrain / Engine and ECT / DTC.

Read DTCs.

Result

Display (DTC Output)	Proceed To
P0130	A
Other DTCs are output besides P0130	B

REPLACE HEATED OXYGEN SENSOR

CONFIRM IF VEHICLE RAN OUT OF FUEL IN PAST
1. Confirm if the vehicle ran out of fuel or not in the past.
  
  Tech Tips
  
  There is no problem, if DTC P0130 is not output after the CONFIRMATION DRIVING PATTERN. This means that the ECM records DTC P0130 because of the running out of fuel in the past.
NO
CHECK FOR INTERMITTENT PROBLEMS

YES

DTC IS CAUSED BY RUNNING OUT OF FUEL