SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P0130, P0134

DTC Code DTC Name
P0130 Oxygen (A/F) Sensor Circuit (Bank 1 Sensor 1)
P0134 Oxygen (A/F) Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

DESCRIPTION

In order to obtain a high purification rate for the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a Three-Way Catalytic Converter (TWC) is used. For the most efficient use of the TWC, 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 whereby 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. The heated oxygen sensor informs the ECM of the lean condition (low voltage, i.e. less than 0.45 V). When the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas is reduced. And the heated oxygen sensor informs the ECM of the rich condition (high voltage, i.e. more than 0.45 V). The ECM judges by the voltage output of the heated oxygen sensor whether the air-fuel ratio is rich or lean and controls the injection time accordingly. If a malfunction of the heated oxygen sensor causes an output of abnormal voltage, the ECM is unable to perform accurate air-fuel ratio control. The heated oxygen sensor includes 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), a current flows to the heater in order to heat the sensor for accurate oxygen concentration detection.

A0137QPE01
DTC No. DTC Detection Condition Trouble Area
P0130

All of conditions below continue for 20 seconds during air-fuel ratio feedback control (3 trip detection logic).


  • Heated oxygen sensor (sensor 1) output voltage is less than 0.06 V.

  • Heated oxygen sensor (sensor 2) output voltage is 0.5 V or more.

  • Short to GND in heated oxygen sensor (sensor 1) circuit

  • Heated oxygen sensor (sensor 1)

  • ECM
P0130 Heated oxygen sensor (sensor 1) output voltage is less than 0.06 V within 1 second after engine was started with engine coolant temperature 42°C (107°F) or less (last engine operation was stopped after warm-up) (3 trip detection logic).

  • Short to GND in heated oxygen sensor (sensor 1) circuit

  • Heated oxygen sensor (sensor 1)

  • ECM
P0130

The conditions below continue for 20 seconds during air-fuel ratio feedback control (3 trip detection logic).


  • Heated oxygen sensor (sensor 2) output voltage is less than 0.1 V.

  • Heated oxygen sensor (sensor 1) output voltage is between 0.6 and 1.5 V.

  • Heated oxygen sensor (sensor 1)
P0134 Heated oxygen sensor (sensor 1) output voltage is between 0.4 and 0.6 V for 20 seconds or more (3 trip detection logic).

  • Open in heated oxygen sensor (sensor 1) circuit

  • Heated oxygen sensor (sensor 1)
P0134

All of the conditions below are met (3 trip detection logic).


  • Heated oxygen sensor (sensor 1) output voltage is between 0.2 or more.

  • Heated oxygen sensor (sensor 2) output voltage is 0.2 V or more.

  • Fuel cut is performed for 3 seconds or more.

  • Open or short in heated oxygen sensor (sensor 1) circuit

  • Heated oxygen sensor (sensor 1)

  • ECM
P0134 ECM determines that internal resistance of heated oxygen sensor (sensor 1) is 20 kΩ or more (3 trip detection logic).

  • Open in heated oxygen sensor (sensor 1) circuit

  • Heated oxygen sensor (sensor 1)

Tech Tips


  • The internal resistance of the heated oxygen sensor (sensor 1) cannot be measured using a tester.

  • Sensor 1 refers to the sensor near the engine assembly.

  • The output voltage of the heated oxygen sensor and the short-term fuel trim value can be read using the intelligent tester.

WIRING DIAGRAM

A0138MUE01

CONFIRMATION DRIVING PATTERN


INSPECTION PROCEDURE

Note

After replacing the ECM, perform electronic throttle learning Click here.

Inspect the fuses for circuits related to this system before performing the following 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 help determine if the vehicle was moving or stationary, 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.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (O2S B1 S1)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / O2S B1 S1.

    4. Warm up the heated oxygen sensor at an engine speed of 2500 rpm for approximately 90 seconds.

    5. Read the output voltage of the heated oxygen sensor during engine idling.

      Standard voltage
      Fluctuates between less than 0.4 V and more than 0.6 V (see the following figure).
      A0138V8E01
      Result
      Result Proceed to
      Outside standard range A
      Within standard range B

    B

    PERFORM CONFIRMATION DRIVING PATTERN Click here

    A

  2. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 1) - ECM)


    1. A0136CPE01

      Disconnect the heated oxygen sensor connector (sensor 1).

    2. Disconnect the ECM connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B21-3 (OX1A) - B25-34 (OX1A) Always Below 1 Ω
      B21-1 (HT1A) - B25-2 (HT1A) Always Below 1 Ω
      B21-4 (E1) - B25-32 (E11) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B21-3 (OX1A) or B25-34 (OX1A) - Body ground Always 10 kΩ or higher
      B21-1 (HT1A) or B25-2 (HT1A) - Body ground Always 10 kΩ or higher

    4. Reconnect the heated oxygen sensor connector.

    5. Reconnect the ECM connectors.

      A0137POE01

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HEATED OXYGEN SENSOR (SENSOR 1)

  3. PERFORM CONFIRMATION DRIVING PATTERN

    Tech Tips

    Clear all DTCs prior to performing the confirmation driving pattern.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0130 OR P0134)


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    4. Read DTCs.

      Result
      Result Proceed to
      P0130 and/or P0134 A
      No output B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  5. REPLACE HEATED OXYGEN SENSOR (SENSOR 1)


    1. Replace the heated oxygen sensor (sensor 1) Click here.


    NEXT

  6. PERFORM CONFIRMATION DRIVING PATTERN

    Tech Tips

    Clear all DTCs prior to performing the confirmation driving pattern.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0130 OR P0134)


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    4. Read DTCs.

      Result
      Result Proceed to
      P0130 and/or P0134 A
      No output B

    B

    END

    A

    REPLACE ECM Click here