SFI SYSTEM, Diagnostic DTC:P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256

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)
P2240 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 2 Sensor 1)
P2241 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1)
P2242 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 2 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)
P2255 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1)
P2256 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 2 Sensor 1)

DESCRIPTION

Refer to DTC P2195 Click here.

Tech Tips

Although the DTC titles include oxygen sensor, these DTCs relate to the air fuel ratio sensor.

DTC No. DTC Detection Condition Trouble Area

P2237

P2240

Open in the circuit between terminals A1A+ (A2A+) and A1A- (A2A+) of the air fuel ratio sensor while engine running

(2 trip detection logic)

  • Open in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • ECM

P2238

P2241

  • Case 1:

Condition (a) or (b) continues for 5.0 seconds or more

(2 trip detection logic):

(a) Voltage at terminal A1A+ (A2A+) is 0.5 V or less

(b) Voltage difference between terminals A1A+ (A2A+) and A1A- (A2A-) is 0.1 V or less for 10 seconds


  • Case 2:

Air fuel ratio sensor admittance: Less than 0.0074 1/Ω

(2 trip detection logic)

  • Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • ECM

P2239

P2242

A1A+ (A2A+) voltage is more than 4.5 V for 5.0 seconds or more

(2 trip detection logic)

  • Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • ECM

P2252

P2255

A1A- (A2A-) voltage is 0.5 V or less for 5.0 seconds or more

(2 trip detection logic)

  • Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • ECM

P2253

P2256

A1A- (A2A-) voltage is more than 4.5 V for 5.0 seconds or more

(2 trip detection logic)

  • Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • ECM

Tech Tips


  • DTCs P2237, P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.

  • DTCs P2240, P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.

WIRING DIAGRAM

Refer to DTC P2195 Click here.

INSPECTION PROCEDURE

Tech Tips


  • Refer to "Data List / Active Test" [AFS Voltage B1S1 and AFS Voltage B2S1] 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.

  • Bank 1 refers to the bank that includes cylinder No. 1.

  • Bank 2 refers to the bank that does not include cylinder No. 1.

  • 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 (Check for Open)
      Tester Connection Condition Specified Condition
      D20-1 (HA1A) - D1-22 (HA1A) Always Below 1 Ω
      D20-3 (A1A+) - D1-126 (A1A+) Always Below 1 Ω
      D20-4 (A1A-) - D1-125 (A1A-) Always Below 1 Ω
      D19-1 (HA2A) - D1-20 (HA2A) Always Below 1 Ω
      D19-3 (A2A+) - D1-103 (A2A+) Always Below 1 Ω
      D19-4 (A2A-) - D1-102 (A2A-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D20-1 (HA1A) or D1-22 (HA1A) - Body ground Always 10 kΩ or higher
      D20-3 (A1A+) or D1-126 (A1A+) - Body ground Always 10 kΩ or higher
      D20-4 (A1A-) or D1-125 (A1A-) - Body ground Always 10 kΩ or higher
      D19-1 (HA2A) or D1-20 (HA2A) - Body ground Always 10 kΩ or higher
      D19-3 (A2A+) or D1-103 (A2A+) - Body ground Always 10 kΩ or higher
      D19-4 (A2A-) or D1-102 (A2A-) - 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 (AIR FUEL RATIO SENSOR - ECM)

    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, P2240, P2241, P2242, P2252, P2253, P2255 OR P2256)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

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

    6. Turn the engine switch on and turn the tester on.

    7. Drive the vehicle referring to the Confirmation Driving Pattern on DTC P2195 Click here.

    8. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

    9. Input the DTC: P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256.

    10. Check the DTC judgment.

      Result
      Result Proceed to
      NORMAL (DTC is not output) A

      ABNORMAL

      (DTC P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256 is output)

      		 B

    B

    REPLACE ECM Click here

    A

    END