ECD SYSTEM(for Swirl Control Valve), Diagnostic DTC:P0036,P0037 and P0038

DTC Code DTC Name
P0036 HO2S Heater Control Circuit Bank 1 Sensor 2
P0037 HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0038 HO2S Heater Control Circuit High Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0030 (Click here).

DTC No.

DTC Detection Condition

Trouble Area

P0036

Open in air fuel ratio sensor (for sensor 2) heater circuit for 2 seconds.

(3 trip detection logic)

  • Open in air fuel ratio sensor (for sensor 2) heater circuit

  • Air fuel ratio sensor (for sensor 2)

  • ECM

DTC No.

DTC Detection Condition

Trouble Area

P0037

Ground short in air fuel ratio sensor (for sensor 2) heater circuit for 2 seconds.

(3 trip detection logic)

  • Open in air fuel ratio sensor (for sensor 2) heater circuit

  • Air fuel ratio sensor (for sensor 2)

  • ECM

DTC No.

DTC Detection Condition

Trouble Area

P0038

Battery short in air fuel ratio sensor (for sensor 2) heater circuit for 2 seconds.

(3 trip detection logic)

  • Open in air fuel ratio sensor (for sensor 2) heater circuit

  • Air fuel ratio sensor (for sensor 2)

  • ECM

WIRING DIAGRAM

Refer to DTC P0030 (Click here).

CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM and/or air fuel ratio sensor, the ECM needs Registration and Initialization (Click here).

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

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. 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, and other data from the time the malfunction occurred.

PROCEDURE

  1. INSPECT AIR FUEL RATIO SENSOR (FOR SENSOR 2) (HEATER RESISTANCE)

    1. A311436E02

      Disconnect the air fuel ratio sensor (for sensor 2) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      4 (+B) - 3 (HAF2)

      20°C (68°F)

      2.0 to 3.2 Ω
      Table 1. Text in Illustration

      *a

      Component without harness connected

      (Air Fuel Ratio Sensor (for Sensor 2))

    REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 2)Click here

  2. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - ECM)

    1. Disconnect the air fuel ratio sensor (for sensor 2) 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

      C121-1 (AF2+) - C112-130 (AF2+)

      Always

      Below 1 Ω

      C121-2 (AF2-) - C112-133 (AF2-)

      Always

      Below 1 Ω

      C121-3 (HAF2) - C112-17 (HAF2)

      Always

      Below 1 Ω

      C121-5 (TR2) - C112-131 (TR2)

      Always

      Below 1 Ω

      C121-6 (RE2) - C112-134 (RE2)

      Always

      Below 1 Ω

      C121-1 (AF2+) or C112-130 (AF2+) - Body ground

      Always

      10 kΩ or higher

      C121-2 (AF2-) or C112-133 (AF2-) - Body ground

      Always

      10 kΩ or higher

      C121-3 (HAF2) or C112-17 (HAF2) - Body ground

      Always

      10 kΩ or higher

      C121-5 (TR2) or C112-131 (TR2) - Body ground

      Always

      10 kΩ or higher

      C121-6 (RE2) or C112-134 (RE2) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    U122316E02

    1. Disconnect the air fuel ratio sensor (for sensor 2) connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      C121-4 (+B) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to air fuel ratio sensor (for sensor 2))

    CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - EFI MAIN RELAY)Click here

  4. REPLACE ECM

    1. Replace the ECM (Click here).

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 2)

    1. Replace the air fuel ratio sensor (for sensor 2) (Click here).

    2. Perform the O2 sensor learning value reset (Click here).

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 2) - EFI MAIN RELAY)

    1. Disconnect the air fuel ratio sensor (for sensor 2) connector.

    2. Remove the EFI MAIN relay from the engine room No. 1 relay block.

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

      Standard Resistance (for LHD)

      Tester Connection

      Condition

      Specified Condition

      C121-4 (+B) - 3 (EFI MAIN relay holder)

      Always

      Below 1 Ω

      C121-4 (+B) or 3 (EFI MAIN relay holder) - Body ground

      Always

      10 kΩ or higher

      Standard Resistance (for RHD)

      Tester Connection

      Condition

      Specified Condition

      C121-4 (+B) - 5 (EFI MAIN relay holder)

      Always

      Below 1 Ω

      C121-4 (+B) or 5 (EFI MAIN relay holder) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

  7. CHECK ECM POWER SOURCE CIRCUIT

    1. Check the ECM power source circuit (Click here).

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

  9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs (Click here).

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Confirm that the DTC is not output again.

    END