SFI SYSTEM(w/o EGR System), Diagnostic DTC:P0037,P0038,P0057,P0058,P102D and 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

Tip:

  • When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. The ECM continues operating in fail-safe mode 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.

    A164717E22

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P0037

Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

The heater current is below the specified value while the heater is operating (1 trip detection logic).

  • Open in heated oxygen sensor heater circuit

  • Heated oxygen sensor heater (for Sensor 2)

  • No. 1 integration relay

  • ECM

Comes on

DTC stored

P0038

Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

The heater current is higher than the specified value while the heater is operating (1 trip detection logic).

  • Short in heated oxygen sensor heater circuit

  • Heated oxygen sensor heater (for Sensor 2)

  • No. 1 integration relay

  • ECM

Comes on

DTC stored

P0057

Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2)

The heater current is below the specified value while the heater is operating (1 trip detection logic).

  • Open in heated oxygen sensor heater circuit

  • Heated oxygen sensor heater (for Sensor 2)

  • No. 1 integration relay

  • ECM

Comes on

DTC stored

P0058

Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2)

The heater current is higher than the specified value while the heater is operating (1 trip detection logic).

  • Short in heated oxygen sensor heater circuit

  • Heated oxygen sensor heater (for Sensor 2)

  • No. 1 integration relay

  • ECM

Comes on

DTC stored

P102D

O2 Sensor Heater Circuit Performance Bank 1 Sensor 2 Stuck ON

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

ECM

Comes on

DTC stored

P105D

O2 Sensor Heater Circuit Performance Bank 2 Sensor 2 Stuck ON

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

ECM

Comes on

DTC stored

MONITOR DESCRIPTION

The sensing portion of the heated oxygen 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 heater and stores a DTC.

Tip:

Normally, the heated oxygen sensor current is 0.4 to 1 A (when the engine is idling, the heated oxygen sensor is warmed up and battery voltage is 11 to 14 V).

CONFIRMATION DRIVING PATTERN

A198819E54

  1. Connect the intelligent tester to the DLC3.

  2. Turn the engine switch on (IG) and turn the tester on.

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the tester on [A].

  6. Start the engine and idle it for 5 minutes or more [B].

  7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].

  8. Idle the engine for 5 minutes or more [D].

  9. Enter the following menus: Powertrain / Engine and ECT / DTC [E].

  10. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P0037, P0038, P0057, P0058, P102D or P105D.

  13. Check the DTC judgment result.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed

    • System normal

    ABNORMAL

    • DTC judgment completed

    • System abnormal

    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.

WIRING DIAGRAM

Refer to DTC P0136 (Click here).

CAUTION / NOTICE / HINT

Note:

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

Tip:

  • 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.

  • Refer to "Data List / Active Test" [O2 Heater B1S2, O2 Heater B2S2, O2 Heater Curr Val B1S2 and O2 Heater Curr Val B2S2] (Click here).

  • 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.

PROCEDURE

  1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

    1. Inspect the heated oxygen sensor.

      Click here

      Result

      Result

      OK

      NG
    NG

    REPLACE HEATED OXYGEN SENSOR

    Click here

    OK

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

    1. A218939C01

      *A

      Bank 1 sensor 2

      *B

      Bank 2 sensor 2

      *a

      Front view of wire harness connector

      (to Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

    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

      C22-2 (+B) - Body ground

      Engine switch on (IG)

      11 to 14 V

      C21-2 (+B) - Body ground

      Engine switch on (IG)

      11 to 14 V

      Result

      Result

      OK

      NG
    NG

    INSPECT NO. 1 INTEGRATION RELAY (EFI)Click here

    OK

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

    1. Disconnect the heated oxygen sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C22-1 (HT1B) - C31-12 (HT1B)

      Always

      Below 1 Ω

      C21-1 (HT2B) - C31-13 (HT2B)

      Always

      Below 1 Ω

      C22-1 (HT1B) or C31-12 (HT1B) - Body ground

      Always

      10 kΩ or higher

      C21-1 (HT2B) or C31-13 (HT2B) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. 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

      Powertrain > Engine and ECT > Clear DTCs

    5. Start the engine.

    6. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    7. Read the output pending DTCs using the intelligent tester.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      No pending DTC is output

      A

      Pending DTC P0037, P0038, P0057, P0058, P102D and/or P105D is output

      B
    A

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    B

    REPLACE ECM

    Click here

  5. INSPECT NO. 1 INTEGRATION RELAY (EFI)

    1. Inspect the No. 1 integration relay (EFI).

      Click here

      Result

      Result

      OK

      NG
    NG

    REPLACE NO. 1 INTEGRATION RELAY (EFI)

    Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - NO. 1 INTEGRATION RELAY)

    1. Disconnect the heated oxygen sensor connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C22-2 (+B) - 1B-4

      Always

      Below 1 Ω

      C21-2 (+B) - 1B-4

      Always

      Below 1 Ω

      C22-2 (+B) or 1B-4 - Body ground

      Always

      10 kΩ or higher

      C21-2 (+B) or 1B-4 - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    CHECK ECM POWER SOURCE CIRCUIT

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR