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

Refer to DTC P0136 Click here.

Tech Tips


  • Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located far from the engine assembly.

  • 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 engine switch is turned off.

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

    A01CG1PE04
DTC No. DTC Detection Condition Trouble Area

P0037

P0057

Heated oxygen sensor heater (bank 1, 2 sensor 2) current is less than 0.3 A

(1 trip detection logic)

  • Open in heated oxygen sensor heater (bank 1, 2 sensor 2) circuit

  • Heated oxygen sensor heater (bank 1, 2 sensor 2)

  • ECM

P0038

P0058

Heated oxygen sensor heater (bank 1, 2 sensor 2) current fail

(1 trip detection logic)

  • Short in heated oxygen sensor heater (bank 1, 2 sensor 2) circuit

  • Heated oxygen sensor heater (bank 1, 2 sensor 2)

  • ECM

P102D

P105D

Heated oxygen sensor 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

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.

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

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

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

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

  • Change the fuel injection volume using the Control the Injection Volume for A/F Sensor function provided in the Active Test and monitor the heated oxygen sensor output voltage Click here. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

PROCEDURE


  1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)


    1. Inspect the heated oxygen sensor Click here.


    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

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


    1. Disconnect the heated oxygen sensor connector.

      A01CCYTE01

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G37-1 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      D24-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V

    4. Reconnect the heated oxygen sensor connector.


    NG

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

    OK

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


    1. Disconnect the heated oxygen sensor connector.

    2. Disconnect the ECM connector.

    3. Turn the engine switch on (IG).

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      G37-2 (HT1B) - D1-48 (HT1B) Always Below 1 Ω
      D24-1 (HT2B) - D1-47 (HT2B) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G37-2 (HT1B) or D1-48 (HT1B) - Body ground Always 10 kΩ or higher
      D24-1 (HT2B) or D1-47 (HT2B) - Body ground Always 10 kΩ or higher

    5. Reconnect the heated oxygen sensor connector.

    6. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM Click here