DTC P2237-P2239, P2252, P2253; Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) [12/2012 - 08/2014]: Procedure

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
   B8-1 (HA1A) - B77-23 (HA1A)	Always	Below 1 Ω
   B8-3 (A1A+) - B77-133 (A1A+)	Always	Below 1 Ω
   B8-4 (A1A-) - B77-134 (A1A-)	Always	Below 1 Ω
   B8-1 (HA1A) or B77-23 (HA1A) - Body ground	Always	10 kΩ or higher
   B8-3 (A1A+) or B77-133 (A1A+) - Body ground	Always	10 kΩ or higher
   B8-4 (A1A-) or B77-134 (A1A-) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Replace the air fuel ratio sensor.

   Refer to REMOVAL [12/2012 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

   Refer to INITIALIZATION [12/2012 - ]

Result: 

NEXT 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2012 - ]

   Powertrain > Engine and ECT > Clear DTCs 

5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

   Powertrain > Engine and ECT > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P2237, P2238, P2239, P2252 or P2253.
11. Check the DTC judgment result.

    Result

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

Result: 

A 

END 

Result: 

B 

REPLACE ECM:  REMOVAL [12/2012 - ]