SFI SYSTEM, Diagnostic DTC:P0037, P0038, P0057, P0058, P102D, P105D

DTC Code DTC Name
P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)
P0038 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)
P0057 Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2)
P0058 Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2)
P102D O2 Sensor Heater Circuit Performance Bank 1 Sensor 2 Stuck ON
P105D O2 Sensor Heater Circuit Performance Bank 2 Sensor 2 Stuck ON

DESCRIPTION


Tech Tips


  • When any of these DTCs is stored, the ECM enters fail-safe mode. The ECM turns off the Heated Oxygen (HO2) Sensor heater in fail-safe mode. Fail-safe mode continues until the engine switch is turned off.

  • The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The HO2 sensor heater circuit uses a relay on the +B side of the circuit.

    A01ENR8E02
DTC Code DTC Detection Condition Trouble Area

P0037

P0057

 The Heated Oxygen (HO2) sensor heater current is below 0.3 A (1 trip detection logic).

  • Open in Heated Oxygen (HO2) sensor heater circuit

  • HO2 sensor heater (for Sensor 2)

  • Integration relay

  • ECM

P0038

P0058

 The Heated Oxygen (HO2) sensor heater current is exceeds the specified value (1 trip detection logic).

  • Short in HO2 sensor heater circuit

  • HO2 sensor heater (for Sensor 2)

  • Integration relay

  • ECM

P102D

P105D

 The heater current is higher than the specified value while the heater is not operating (1 trip detection logic). ECM

Tech Tips


  • Bank 1 refers to the bank that includes the No. 1 cylinder.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

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

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

MONITOR DESCRIPTION

The sensing portion of the Heated Oxygen (HO2) sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor.

Heated oxygen sensor heater range check (P0037, P0038, P0057, P0058, P102D and P105D):

The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions. If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor and stores a DTC.

WIRING DIAGRAM

Refer to DTC P0136 Click here.

CONFIRMATION DRIVING PATTERN

These DTCs are stored when the engine idles for 110 seconds or more.

INSPECTION PROCEDURE

Tech Tips


  • Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far from the engine assembly.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

    A01ENR7E01

    1. Disconnect the heated oxygen (HO2) sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 Ω
      1 (HT1B) - 4 (E1) Always 10 kΩ or higher
      1 (HT2B) - 2 (+B) 20°C (68°F) 11 to 16 Ω
      1 (HT2B) - 4 (E1) Always 10 kΩ or higher

    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  2. CHECK TERMINAL VOLTAGE (+B OF HO2 SENSOR)

    A01ER69E01

    1. Disconnect the HO2 sensor connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C17-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      C18-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK HARNESS AND CONNECTOR (HO2 SENSOR - ECM) Click here

    A

  3. INSPECT INTEGRATION RELAY (EFI)


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

    2. A01EN9SE04

      Inspect the EFI MAIN fuse.


      1. Remove the EFI MAIN fuse from the integration relay.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        EFI MAIN fuse Always Below 1 Ω

      3. Reinstall the EFI MAIN fuse.

    3. Inspect the EFI relay.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1C-1 - 1B-4 No battery voltage applied to terminals 1B-2 and 1B-3 10 kΩ or higher
        Battery voltage applied to terminals 1B-2 and 1B-3 Below 1 Ω

    NG

    REPLACE INTEGRATION RELAY (EFI)

    OK

  4. CHECK HARNESS AND CONNECTOR (HO2 SENSOR - INTEGRATION RELAY)


    1. A01EQ3UE01

      Check the EFI NO. 2 fuse.


      1. Remove the EFI NO. 2 fuse from the engine room relay block.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        EFI NO. 2 fuse Always Below 1 Ω

      3. Reinstall the EFI NO. 2 fuse.

    2. Disconnect the HO2 sensor connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C17-2 (+B) - 1B-4 Always Below 1 Ω
      C18-2 (+B) - 1B-4 Always Below 1 Ω
      C17-2 (+B) or 1B-4 - Body ground Always 10 kΩ or higher
      C18-2 (+B) or 1B-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

  5. CHECK HARNESS AND CONNECTOR (HO2 SENSOR - ECM)


    1. Disconnect the HO2 sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C17-1 (HT1B) - C53-45 (HT1B) Always Below 1 Ω
      C18-1 (HT2B) - C53-44 (HT2B) Always Below 1 Ω
      C17-1 (HT1B) or C53-45 (HT1B) - Body ground Always 10 kΩ or higher
      C18-1 (HT2B) or C53-44 (HT2B) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      C17-1 (HT1B) - C54-45 (HT1B) Always Below 1 Ω
      C18-1 (HT2B) - C54-44 (HT2B) Always Below 1 Ω
      C17-1 (HT1B) or C54-45 (HT1B) - Body ground Always 10 kΩ or higher
      C18-1 (HT2B) or C54-44 (HT2B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear DTCs Click here.

    5. Start the engine.

    6. Allow the engine to idle for 2 minutes or more.

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

    8. Read DTCs.

      Result
      Result Proceed to
      No DTC is output A
      P0037, P0038, P0057, P0058, P102D and/or P105D are output B

    B

    REPLACE ECM Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here