СИСТЕМА SFI, Diagnostic DTC:P2A00, P2A03

DTC Code DTC Name
P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)
P2A03 A/F Sensor Circuit Slow Response (Bank 2 Sensor 1)

DESCRIPTION

Refer to DTC P2195 Click here.

DTC No. DTC Detection Condition Trouble Area

P2A00

P2A03

 Calculated test value for A/F sensor response rate deterioration level is less threshold

  • Open or short in A/F sensor (bank 1, 2 sensor 1)

  • A/F sensor (bank 1, 2 sensor1)

  • ECM

WIRING DIAGRAM

Refer to DTC P2195 Click here.

INSPECTION PROCEDURE

Tech Tips

Intelligent tester only:

Malfunctioning areas can found by performing the Active Test / Control the Injection volume for A/F sensor operation. The "Control the injection volume for A/F sensor" operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

Perform Active Test using the intelligent tester.

Tech Tips

"Control the injection volume for A/F sensor" is an Active Test which changes the injection volume to -12.5% or +25%.


  1. Connect the intelligent tester to the DLC3.

  2. Start the engine and turn the tester ON.

  3. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.

  4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the injection volume for A/F sensor.

  5. Enter the following monitor items: AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2.

  6. Perform the "Control the injection volume for A/F sensor" operation with the engine in a idling condition (press the right or left button).

Tech Tips


  • The "Control the injection volume for A/F sensor" operation lowers the fuel injection volume by 12.5 % or increases the injection volume by 25 %.


  • Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Standard:

Tester Display

(Sensor)

 Injection Volume Status Voltage

AFS B1S1 or AFS B2S1

(A/F)

 +25 % Rich Less than 3.0

AFS B1S1 or AFS B2S1

(A/F)

 -12.5 % Lean More than 3.35

O2S B1S2 or O2S B2S2

(heated oxygen sensor)

 +25 % Rich More than 0.55

O2S B1S2 or O2S B2S2

(heated oxygen sensor)

 -12.5 % Lean Less than 0.4

Note

The A/F sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case

A/F Sensor (Sensor 1)

Output Voltage

Heated Oxygen Sensor (Sensor 2)

Output Voltage

 Main Suspected Trouble Areas
1

Injection volume

+25 %

-12.5 %

 A01DUZ5

Injection volume

+25 %

-12.5 %

 A01DUZ5 -

Output voltage

More than 3.35 V

Less than 3.0 V

 A01DW5S

Output voltage

More than 0.55 V

Less than 0.4 V

 A01DVNA
2

Injection volume

+25 %

-12.5 %

 A01DUZ5

Injection volume

+25 %

-12.5 %

 A01DUZ5

  • A/F sensor

  • A/F sensor heater

    A/F sensor circuit

Output voltage

Almost

no reaction

 A01E300

Output voltage

More than 0.55 V

Less than 0.4 V

 A01DVNA
3

Injection volume

+25 %

-12.5 %

 A01DUZ5

Injection volume

+25 %

-12.5 %

 A01DUZ5

  • Heated oxygen sensor

  • Heated oxygen sensor heater

  • Heated oxygen sensor circuit

Output voltage

More than 3.35 V

Less than 3.0 V

 A01DW5S

Output voltage

Almost

no reaction

 A01E300
4

Injection volume

+25 %

-12.5 %

 A01DUZ5

Injection volume

+25 %

-12.5 %

 A01DUZ5

  • Injector

  • Fuel pressure

  • Gas leakage from exhaust system

    (air-fuel ratio extremely lean or rich)

Output voltage

Almost

no reaction

 A01E300

Output voltage

Almost

no reaction

 A01E300

Tech Tips


  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

  • These DTCs are related to the A/F sensor.

  • These DTCs are recorded when A/F sensor has malfunction, although the caption is oxygen sensor.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT (BESIDES A/F SENSOR DTC)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the tester ON.

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

    4. Read DTCs.

      Result
      Display Proceed to
      DTC P2A00 and/or P2A03 are output A
      DTC P2A00 and/or P2A03 and other codes are output B

      Tech Tips

      If any other code besides P2A00 and/or P2A03 are output, perform troubleshooting for those DTCs first.


    B

    GO TO RELEVANT DTC CHART

    A

  2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

    A01E2SYE37

    1. Disconnect the A/F sensor connector.

    2. Measure the resistance of the A/F sensor.

      Standard resistance (Bank 1 Sensor 1)
      Tester Connection Condition Specified Condition
      1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω
      1 (HA1A) - 4 (A1A-) - 10 kΩ or higher
      Standard resistance (Bank 2 Sensor 1)
      Tester Connection Condition Specified Condition
      1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω
      1 (HA2A) - 4 (A2A-) - 10 kΩ or higher

    NG

    REPLACE AIR FUEL RATIO SENSOR

    OK

  3. CHECK WIRE HARNESS (A/F SENSOR -ECM)

    A01E33RE06

    1. Disconnect the A18 or A25 A/F sensor connector.

    2. Disconnect the E6 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Bank 1 Sensor 1)
      Tester Connection Specified Condition
      A18-1 (HA1A) - E16-2 (HA1A) Below 1 Ω
      A18-3 (A1A+) - E16-22 (A1A+) Below 1 Ω
      A18-4 (A1A-) - E16-30 (A1A-) Below 1 Ω
      A18-1 (HA1A) or E16-2 (HA1A) - Body ground 10 kΩ or higher
      A18-3 (A1A+) or E16-22 (A1A+) - Body ground 10 kΩ or higher
      A18-4 (A1A-) or E16-30 (A1A-) - Body ground 10 kΩ or higher
      Standard resistance (Bank 2 Sensor 1)
      Tester Connection Specified Condition
      A25-1 (HA2A) - E16-1 (HA2A) Below 1 Ω
      A25-3 (A2A+) - E16-23 (A2A+) Below 1 Ω
      A25-4 (A2A-) - E16-31 (A2A-) Below 1 Ω
      A25-1 (HA2A) or E16-1 (HA2A) - Body ground 10 kΩ or higher
      A25-3 (A2A+) or E16-23 (A2A+) - Body ground 10 kΩ or higher
      A25-4 (A2A-) or E16-31 (A2A-) - Body ground 10 kΩ or higher
      A01E25OE04

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  4. PERFORM CONFIRMATION DRIVING PATTERN


    NEXT

  5. CHECK WHETHER OUTPUT DTC RECURS (P2A00 OR P2A03)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the tester ON.

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

    4. Read DTCs.

      Result
      Display Proceed to
      DTC P2A00 and/or P2A03 are not output A
      DTC P2A00 and/or P2A03 are output B

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

  6. REPLACE AIR FUEL RATIO SENSOR


    NEXT

  7. PERFORM CONFIRMATION DRIVING PATTERN


    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (P2A00 OR P2A03)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the tester ON.

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

    4. Read DTCs.

      Result
      Display Proceed to
      DTC P2A00 and/or P2A03 are not output A
      DTC P2A00 and/or P2A03 are output B

    A

    CHECK AIR FUEL RATIO EXTREMELY LEAN OR RICH

    B

    END