ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P2237, P2238, P2239, P2252, P2253

DTC Code DTC Name
P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)
P2238 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
P2239 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
P2252 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1)
P2253 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1)

DESCRIPTION

Tech Tips

If DTC P2237, P2238, P2239, P2252 and/or P2253 is present, refer to the DTC table for DPF system.

Click here

Refer to DTC P0031.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)

When either of the following conditions is met (1 trip detection logic):


  • An open in the circuit between terminals A1A+ and A1A-, voltage difference between terminals A1A+ and A1A- is 0.1 V or less.

  • The resistance of the air fuel ratio sensor element is 250 Ω or higher for 5 seconds or more.

Main trouble area: Open in air fuel ratio sensor circuit


  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • ECM

 Comes on DTC stored
P2238 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1) The A1A+ voltage is 1.0 V or less (1 trip detection logic).

Main trouble area: Open in air fuel ratio sensor circuit


  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • ECM

 Comes on DTC stored
P2239 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1) The A1A+ voltage is higher than 4.0 V (1 trip detection logic).

Main trouble area: Short in air fuel ratio sensor circuit


  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • ECM

 Comes on DTC stored
P2252 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1) The A1A- voltage is 0.5 V or less (1 trip detection logic).

Main trouble area: Open in air fuel ratio sensor circuit


  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • ECM

 Comes on DTC stored
P2253 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1) The A1A- voltage is higher than 4.0 V (1 trip detection logic).

Main trouble area: Short in air fuel ratio sensor circuit


  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List

P2237

P2238

P2239

P2252

P2253

  • AFS Voltage B1S1

  • Exhaust Temperature B1S2

MONITOR DESCRIPTION

The air fuel ratio sensor outputs a voltage in proportion to the air fuel ratio. If impedance (alternating current resistance) or voltage output of the sensor deviates greatly from the standard range, the ECM interprets this as an open or short malfunction of the air fuel ratio sensor circuit.

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P2237

Drive the vehicle at 50 km/h (30 mph) or more for a total of 300 seconds or more.

Tech Tips

Make sure that the exhaust gas temperature (Exhaust Temperature B1S2) is 200°C (392°F) or higher.

P2238

P2239

P2252

P2253

 Ignition switch ON for 5 seconds.

WIRING DIAGRAM

Refer to DTC P0031.

Click here

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (Click here) and initialization Click here.

Tech Tips

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 HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)


    1. Disconnect the air fuel ratio 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
      C4-3 (A1A+) - C60-31 (A1A+) Always Below 1 Ω
      C4-4 (A1A-) - C60-32 (A1A-) Always Below 1 Ω
      C4-3 (A1A+) - C60-31 (A1A+) - Body ground and other terminals Always 10 kΩ or higher
      C4-4 (A1A-) or C60-32 (A1A-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK WHETHER DTC OUTPUT RECURS


    1. Warm up the engine (engine coolant temperature is 75°C (167°F) or higher).

    2. Connect the GTS to the DLC3.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for 30 seconds.

    6. Start the engine and turn the GTS on.

    7. Drive the vehicle at 50 km/h (30 mph) or more for a total of 300 seconds or more.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Tech Tips

      Make sure that the exhaust gas temperature (Exhaust Temperature B1S2) is 200°C (392°F) or higher.

    8. Enter the following menus: Powertrain / Engine / Trouble Codes.

    9. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      OK
      No DTC is output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  4. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 6 Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Warm up the engine (engine coolant temperature is 75°C (167°F) or higher).

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    6. Turn the ignition switch off and wait for 30 seconds.

    7. Start the engine and turn the GTS on.

    8. Drive the vehicle at 50 km/h (30 mph) or more for a total of 300 seconds or more.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Tech Tips

      Make sure that the exhaust gas temperature (Exhaust Temperature B1S2) is 200°C (392°F) or higher.

    9. Enter the following menus: Powertrain / Engine / Trouble Codes.

    10. Confirm that the DTC is not output again.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END