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Home >> Toyota >> 2011 >> Matrix Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (2ZR-FE) (Diagnostic Codes (P1604 - P2A00) & Circuit Tests) >> SFI System >> DTC P2A00: A/F Sensor Circuit Slow Response (Bank 1 Sensor 1) >> Procedure
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DTC P2A00: A/F Sensor Circuit Slow Response (Bank 1 Sensor 1): Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read the DTCs.

      Result

      Result Proceed to
      DTC P2A00 is output A
      DTC P2A00 and other DTCs are output B

      HINT: 

      If any DTCs other than P2A00 are output, troubleshoot those DTCs first.

    B → See step   9 

    A: Go to next step 

  2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE). Refer to  PROCEDURE - Step 1 

    NG → See step   10 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) See step   1 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM) 

    OK: Go to next step 

  4. PERFORM CONFIRMATION DRIVING PATTERN 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs. Refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    NEXT: Go to next step 

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00) 
    1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    2. Input the DTC P2A00.
    3. Check the DTC judgment result.

      Result

      Result Proceed to
      ABNORMAL (DTC P2A00 is output) A
      NORMAL (DTC is not output) B

    B → See step   11 

    A: Go to next step 

  6. REPLACE AIR FUEL RATIO SENSOR 
    1. Replace the air fuel ratio sensor. Refer to REMOVAL .

    NEXT: Go to next step 

  7. PERFORM CONFIRMATION DRIVING PATTERN 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs. Refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    NEXT: Go to next step 

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00) 
    1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    2. Input the DTC P2A00.
    3. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P2A00 is output) B

    B → See step   12 

    A → END 

  9. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  10. REPLACE AIR FUEL RATIO SENSOR. Refer to  REMOVAL 
  11. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  12. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO. Refer to  DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1) 
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