DTC    P2A00    A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

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

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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
  1. Open or short in A/F sensor (bank 1, 2 sensor 1)
  2. A/F sensor (bank 1, 2 sensor1)
  3. ECM

WIRING DIAGRAM


INSPECTION PROCEDURE

HINT:
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.

HINT:
"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).

HINT:
  1. 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 %.
  1. 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

NOTICE:
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 %
A103184
Injection volume
+25 %
-12.5 %
A103184
-
Output voltage
More than 3.35 V
Less than 3.0 V
A107708
Output voltage
More than 0.55 V
Less than 0.4 V
A103186
2
Injection volume
+25 %
-12.5 %
A103184
Injection volume
+25 %
-12.5 %
A103184
  1. A/F sensor
  2. A/F sensor heater
    A/F sensor circuit
Output voltage
Almost
no reaction
A103185
Output voltage
More than 0.55 V
Less than 0.4 V
A103186
3
Injection volume
+25 %
-12.5 %
A103184
Injection volume
+25 %
-12.5 %
A103184
  1. Heated oxygen sensor
  2. Heated oxygen sensor heater
  3. Heated oxygen sensor circuit
Output voltage
More than 3.35 V
Less than 3.0 V
A107708
Output voltage
Almost
no reaction
A103185
4
Injection volume
+25 %
-12.5 %
A103184
Injection volume
+25 %
-12.5 %
A103184
  1. Injector
  2. Fuel pressure
  3. Gas leakage from exhaust system
    (air-fuel ratio extremely lean or rich)
Output voltage
Almost
no reaction
A103185
Output voltage
Almost
no reaction
A103185
  1. Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the A/F and heated oxygen sensors.
  2. Enter the following menus on the tester: Powertrain / Engine and ECT / Active Test / Control the injection volume for A/F sensor and Data List / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2.

HINT:
  1. 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.
  2. These DTCs are related to the A/F sensor.
  3. These DTCs are recorded when A/F sensor has malfunction, although the caption is oxygen sensor.

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

  1. Connect the intelligent tester to the DLC3.

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

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

  1. 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

    HINT:
    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)
A085152E15

  1. Disconnect the A/F sensor connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (HT) - 2 (+B)
    		20°C (68°F)
    		1.8 to 3.4 Ω at 20°C (68°F)
    1 (HT) - 4 (AF-)
    		-
    		10 kΩ or higher



NG
REPLACE AIR FUEL RATIO SENSOR
OK


3.CHECK WIRE HARNESS (A/F SENSOR -ECM)
A112437E01

A112696E01

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

  1. Disconnect the E6 ECM connector.

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

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



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.

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

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

  1. 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.

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

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

  1. 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