СИСТЕМА ECD, Diagnostic DTC:P0030

DTC Code DTC Name
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1

DESCRIPTION

The air fuel ratio sensor is a broadband air fuel ratio sensor. The broadband air fuel ratio sensor measures the remaining oxygen in the exhaust gas. Fluctuations in the value of the remaining oxygen are sent to the ECM as a voltage signal.

The air fuel ratio sensor is used as both a control sensor and monitoring sensor in diesel engines. The lambda air fuel ratio sensor is necessary to ensure the value of the exhaust gas is within compliance. The air fuel ratio sensor is necessary for calculating the average amount value for the injectors. The lambda air fuel ratio sensor measures the air fuel ratio. If there is a deviation, the ECM changes the exhaust gas recirculation rate to optimize the air fuel ratio. Adjusting the average amount value is not a control operation which is performed. air fuel ratio sensor deviation is "learned" to the characteristic map and stored temporarily by the ECM.

The sensor system of the broadband air fuel ratio sensor is composed of several thin layers of zirconium dioxide ceramic. The heating element within the laminate ensures the required operating temperature of at least 760°C. The broadband air fuel ratio sensor includes two cells, a measurement cell and a reference cell. These two cells are coated in electrodes made of platinum.

Tech Tips


  • Although the DTC titles say HO2S heater, these DTCs relate to the air fuel ratio sensor heater.

  • Sensor 1 is the sensor installed in the exhaust manifold converter in the front of the catalytic converter.

  • Sensor 2 is the sensor installed in the exhaust manifold converter in the rear of the catalytic converter.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0030 HO2S Heater Control Circuit Bank 1 Sensor 1

Ground short in air fuel ratio sensor (for sensor 1) heater circuit for 2 seconds.

(3 trip detection logic)

  • Short in air fuel ratio sensor (for sensor 1) heater circuit

  • Air fuel ratio sensor (for sensor 1)

  • ECM

 Does not come on DTC stored

WIRING DIAGRAM

A0030CFE02

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.

Tech Tips


  • 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 1) (HEATER RESISTANCE))


    1. Inspect the air fuel ratio sensor (for sensor 1).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 1) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 1) - ECM)


    1. Disconnect the air fuel ratio sensor (for sensor 1) 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
      B213-1 (AF1+) - B220-127 (AF1+) Always Below 1 Ω
      B213-2 (AF1-) - B220-126 (AF1-) Always Below 1 Ω
      B213-3 (HAF1) - B220-46 (HAF1) Always Below 1 Ω
      B213-5 (TR1) - B220-128 (TR1) Always Below 1 Ω
      B213-6 (RE1) - B220-125 (RE1) Always Below 1 Ω
      B213-1 (AF1+) or B220-127 (AF1+) - Body ground Always 10 kΩ or higher
      B213-2 (AF1-) or B220-126 (AF1-) - Body ground Always 10 kΩ or higher
      B213-3 (HAF1) or B220-46 (HAF1) - Body ground Always 10 kΩ or higher
      B213-5 (TR1) or B220-128 (TR1) - Body ground Always 10 kΩ or higher
      B213-6 (RE1) or B220-125 (RE1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 7 Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A003000C08
    *a

    Front view of wire harness connector

    (to Air Fuel Ratio Sensor (for Sensor 1))

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B213-4 (+B) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 1) - EFI MAIN RELAY) Click here

    OK

  4. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  5. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (FOR SENSOR 1) - EFI MAIN RELAY)


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

    2. Remove the EFI MAIN relay from the engine room relay block and junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B213-4 (+B) - 3 (EFI MAIN relay holder) Always Below 1 Ω
      B213-4 (+B) or 3 (EFI MAIN relay holder) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. CHECK ECM POWER SOURCE CIRCUIT


    1. Check the ECM power source circuit.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  8. 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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END

  9. REPLACE AIR FUEL RATIO SENSOR (FOR SENSOR 1)


    1. Replace the air fuel ratio sensor (for sensor 1).

      Click here

    2. Perform the O2 sensor learning value reset.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here