SFI SYSTEM (w/o EGR 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

Refer to DTC P2195 Click here.

DTC No. DTC Detection Condition Trouble Area
P2237 Open in the circuit between terminals A1A+ and A1A- of the air fuel ratio sensor while engine is running (2 trip detection logic).

  • Open in air fuel ratio sensor (sensor 1) circuit

  • Air fuel ratio sensor (sensor 1)

  • ECM
P2238

  • Case 1

    Condition (a) or (b) continues for 5.0 seconds or more (2 trip detection logic):

    (a) A1A+ voltage is 0.5 V or less

    (b) A1A+ - A1A- is 0.1 V or less

  • Case 2

    Air fuel ratio sensor admittance is less than 0.0074 1/Ω (2 trip detection logic):

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

  • Air fuel ratio sensor (sensor 1)

  • ECM
P2239 A1A+ voltage is higher than 4.5 V for 5 seconds (2 trip detection logic).

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

  • Air fuel ratio sensor (sensor 1)

  • ECM
P2252 A1A- voltage is 0.5 V or less for 5 seconds (2 trip detection logic).

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

  • Air fuel ratio sensor (sensor 1)

  • ECM
P2253 A1A- voltage is higher than 4.5 V for 5 seconds (2 trip detection logic).

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

  • Air fuel ratio sensor (sensor 1)

  • ECM

WIRING DIAGRAM

Refer to DTC P2195 Click here.

INSPECTION PROCEDURE

Note

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

Tech Tips


  • Refer to "Data List / Active Test" [AFS Voltage B1S1] Click here.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

  • 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. 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
      D24-1 (HA1A) - D28-18 (HA1A) Always Below 1 Ω
      D24-3 (A1A+) - D28-103 (A1A+) Always Below 1 Ω
      D24-4 (A1A-) - D28-126 (A1A-) Always Below 1 Ω
      D24-1 (HA1A) or D28-18 (HA1A) - Body ground Always 10 kΩ or higher
      D24-3 (A1A+) or D28-103 (A1A+) - Body ground Always 10 kΩ or higher
      D24-4 (A1A-) or D28-126 (A1A-) - Body ground Always 10 kΩ or higher

    4. Reconnect the air fuel ratio sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor Click here.


    NEXT

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2237, P2238, P2239, P2252 OR P2253)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Turn the power switch off and wait for at least 30 seconds.

    6. Put the engine in inspection mode (maintenance mode) Click here.

    7. Start the engine and wait 5 minutes.

    8. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    9. Read the Pending DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P2237, P2238, P2239, P2252 or P2253 is output B

    B

    REPLACE ECM Click here

    A

    END