SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P0135

DTC Code DTC Name
P0135 Oxygen (A/F) Sensor Heater Circuit (Bank 1 Sensor 1)

DESCRIPTION

Refer to DTC P0130. Click here

DTC No. DTC Detecting Condition Trouble Area
P0135 When heater operates, heater current exceeds 2 A (2 trip detection logic)

  • Open or short in heater circuit of heated oxygen sensor

  • Heated oxygen sensor heater

  • ECM
Heater current of 0.2 A or less when heater operates (2 trip detection logic)

WIRING DIAGRAM

Refer to DTC P0130 Click here.

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.

PROCEDURE


  1. INSPECT HEATED OXYGEN SENSOR


    1. A01BEQSE28

      Disconnect the D34 Heated Oxygen (HO2) sensor connector.

    2. Measure the resistance between the terminals of the HO2 sensor connector.

      Resistance
      Tester Connections Specified Conditions
      HT1A (1) - +B (2) 11 to 16 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

    OK

  2. INSPECT ECM (HT1B VOLTAGE)


    1. A01BDNSE33

      Turn the ignition switch to the ON position.

    2. Measure the voltage between the terminals of the ECM connectors.

      Voltage
      Tester Connections Specified Conditions
      HT1A (D1-1) - E03 (D3-4) 9 to 14 V

    NG

    INSPECT ECM POWER SOURCE CIRCUIT Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HO2 SENSOR - ECM, HO2 - INTEGRATION RELAY)


    1. A01BGEEE01

      Check the harness and connectors between the ECM and HO2 sensor.


      1. Disconnect the D34 or HO2 sensor connector.

      2. Disconnect the D1 ECM connector.

      3. Measure the resistance.

        Resistance (Check for open)
        Tester Connections Specified Conditions
        HT1A (D34-1) - HT1A (D1-1) Below 1 Ω
        Resistance (Check for short)
        Tester Connections Specified Conditions
        HT1A (D34-1) or HT1A (D1-1) - Body ground 10 kΩ or higher

      4. Reconnect the HO2 sensor connector.

      5. Reconnect the ECM connector.

    2. Check the harness and connector between the HO2 sensor and integration relay (MAIN relay).


      1. Disconnect the D35 HO2 sensor connector.

      2. Remove the integration relay from the engine room No.1.

      3. Measure the resistance.

        Resistance (Check for open)
        Tester Connections Specified Conditions
        +B (D34-2) - Integration relay (B4) Below 1 Ω
        Resistance (Check for short)
        Tester Connections Specified conditions

        +B (D34-2) or Integration relay (B4)

        - Body ground

        		 10 kΩ or higher

      4. Reconnect the HO2 sensor connector.

      5. Reinstall the integration relay (MAIN relay).


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT ECM POWER SOURCE CIRCUIT


    NG

    REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT

    OK

    REPLACE ECM