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

CAUTION / NOTICE / HINT

DESCRIPTION

Refer to DTC P0136 Click here.

Tech Tips

When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.

A017F30E05
DTC No. DTC Detection Condition Trouble Area

P0037

P0057

 Heated oxygen sensor heater current is less than 0.3 A (1 trip detection logic)

  • Open in heated oxygen sensor heater circuit

  • Heated oxygen sensor heater

  • ECM

P0038

P0058

 Heated oxygen sensor heater current is more than specified value while the heater is operating (1 trip detection logic)

  • Short in heated oxygen sensor heater circuit

  • Heated oxygen sensor heater

  • ECM

P102D

P105D

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

WIRING DIAGRAM

Refer to DTC P0136 Click here.

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


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

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • 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.

  • 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 (HEATER RESISTANCE)


    1. A017CL3E23
      Text in Illustration
      *1 Bank 1
      *2 Bank 2
      *a

      Component without harness connected

      (Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

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

      Standard resistance
      Bank 1
      Tester Connection Condition Specified Condition
      2 (HT1B) - 1 (+B) 20°C (68°F) 11 to 16 Ω
      2 (HT1B) - 3 (E2) Always 10 kΩ or higher
      Bank 2
      Tester Connection Condition Specified Condition
      1 (HT2B) - 2 (+B) 20°C (68°F) 11 to 16 Ω
      1 (HT2B) - 4 (E2) Always 10 kΩ or higher

    3. Reconnect the heated oxygen sensor connector.


    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  2. CHECK TERMINAL VOLTAGE (+B TERMINAL OF HEATED OXYGEN SENSOR)


    1. A017CNVE11
      Text in Illustration
      *1 Bank 1
      *2 Bank 2
      *a

      Front view of wire harness connector

      (to Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      Bank 1
      Tester Connection Switch Condition Specified Condition
      P1-1 (+B) - Body ground Ignition switch on (IG) 11 to 14 V
      Bank 2
      Tester Connection Switch Condition Specified Condition
      B38-2 (+B) - Body ground Ignition switch on (IG) 11 to 14 V

    4. Reconnect the heated oxygen sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - HEATED OXYGEN SENSOR)

    OK

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


    1. Disconnect the heated oxygen sensor connector.

    2. Disconnect the ECM connectors.

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

      Standard resistance (Check for open)
      Bank 1
      Tester Connection Condition Specified Condition
      P1-2 (HT1B) - B47-12 (HT1B) Always Below 1 Ω
      Bank 2
      Tester Connection Condition Specified Condition
      B38-1 (HT2B) - B47-13 (HT2B) Always Below 1 Ω
      Standard resistance (Check for short)
      Bank 1
      Tester Connection Condition Specified Condition
      P1-2 (HT1B) or B47-12 (HT1B) - Body ground Always 10 kΩ or higher
      Bank 2
      Tester Connection Condition Specified Condition
      B38-1 (HT2B) or B47-13 (HT2B) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connectors.

    5. Reconnect the heated oxygen sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)

    OK

  4. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Start the engine and idle it for 5 minutes or more.

    6. When the vehicle stationary, depress the accelerator pedal and maintain an engine speed 3000 rpm for 1 minute.

    7. Idle the engine for 5 minutes or more.

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

    9. Read the DTCs.

      Result
      Display (DTC Output) Proceed to
      No output A
      P0037, P0038, P0057, P0058, P102D and/or P105D B

    B

    REPLACE ECM Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here