СИСТЕМА ECD (для клапана регулирования всасывания), Diagnostic DTC:P2237, P2238, P2239

DTC Code DTC Name
P2237 O2 Sensor Positive Current Control Circuit / Open Bank 1 Sensor 1
P2238 O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 1
P2239 O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1

DESCRIPTION

Refer to DTC P0030 Click here.

DTC No. DTC Detection Condition Trouble Area
P2237

Air fuel ratio sensor (for sensor 1) circuit output voltage is 0 V or less for 2 seconds.

(3 trip detection logic)

  • Open or short in air fuel ratio sensor (for sensor 1) circuit

  • Air fuel ratio sensor (for sensor 1)

  • ECM
DTC No. DTC Detection Condition Trouble Area
P2238

Short to ground detected in air fuel ratio sensor (for sensor 1) circuit for 2 seconds.

(3 trip detection logic)

  • Open or short in air fuel ratio sensor (for sensor 1) circuit

  • Air fuel ratio sensor (for sensor 1)

  • ECM
DTC No. DTC Detection Condition Trouble Area
P2239

Short to +B detected in air fuel ratio sensor (for sensor 1) circuit for 2 seconds.

(3 trip detection logic)

  • Open or short in air fuel ratio sensor (for sensor 1) circuit

  • Air fuel ratio sensor (for sensor 1)

  • ECM

WIRING DIAGRAM

Refer to DTC P0030 Click here.

INSPECTION PROCEDURE

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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2237, P2238 AND/OR P2239)


    1. Connect the GTS to the DLC3.

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

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

    4. Read DTCs.

      Result
      Result Proceed to
      DTC P2237, P2238 and/or P2239 A
      DTC P2237, P2238 and/or P2239 and other DTCs B

      Tech Tips


      • If any DTCs other than DTC P2237, P2238 and/or P2239 are output, troubleshoot those DTCs first.

      • If a DTC is stored for the heater system of the air fuel ratio sensor, first repair the heater system.


    B

    GO TO DTC CHART Click here

    A

  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
      C77-1 (AF1+) - C112-127 (AF1+) Always Below 1 Ω
      C77-2 (AF1-) - C112-126 (AF1-) Always Below 1 Ω
      C77-3 (HAF1) - C112-46 (HAF1) Always Below 1 Ω
      C77-5 (TR1) - C112-128 (TR1) Always Below 1 Ω
      C77-6 (RE1) - C112-125 (RE1) Always Below 1 Ω
      C77-1 (AF1+) or C112-127 (AF1+) - Body ground Always 10 kΩ or higher
      C77-2 (AF1-) or C112-126 (AF1-) - Body ground Always 10 kΩ or higher
      C77-3 (HAF1) or C112-46 (HAF1) - Body ground Always 10 kΩ or higher
      C77-5 (TR1) or C112-128 (TR1) - Body ground Always 10 kΩ or higher
      C77-6 (RE1) or C112-125 (RE1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. 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.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2237, P2238 AND/OR P2239)


    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. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P2237, P2238 AND/OR P2239 B

    B

    REPLACE ECM Click here

    A

    END

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  7. 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.


    NEXT

    END