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

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
3Zr-Fae Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00)

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)

REPLACE AIR FUEL RATIO SENSOR

PERFORM CONFIRMATION DRIVING PATTERN

CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)

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


DESCRIPTION

HINT:
Sensor 1 refers to the sensor mounted in front of the Three Way Catalytic Converter (TWC) and located near the engine assembly.
Refer to DTC P2195 (RAV4_ACA30 RM000000WC4093X_01.html).

DTC No.
DTC Detection Condition
Trouble Area
P2A00
The calculated value of the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic).
  1. Open or short in air fuel ratio sensor (sensor 1) circuit
  2. Air fuel ratio sensor (sensor 1)
  3. Air fuel ratio sensor heater (sensor 1)
  4. ECM

CONFIRMATION DRIVING PATTERN

HINT:
Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System.
Dtc
  P2A00  A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the tester on.
  4. Enter the following menus: Powertrain / Engine and ECT / DTC / Clear.
  5. Clear the DTCs.
  6. Start the engine and warm it up. (Procedure "A")
  7. Drive the vehicle at a constant speed between 64 km/h and 120 km/h (40 mph and 75 mph) for 3 minutes or more. (Procedure "B")
  8. Turn the ignition switch off.
  9. Repeat Procedure "A" and "B" above again.
  10. Enter the following menus: Powertrain / Engine and ECT / DTC.
  11. Check if any DTCs (any pending DTCs) are output.

WIRING DIAGRAM

Refer to DTC P2195 (RAV4_ACA30 RM000000WC4093X_07.html).

INSPECTION PROCEDURE

HINT:
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F sensor function provided in the Active Test. The Control the Injection Volume for A/F sensor function can help to determine whether the Air Fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the Control the Injection Volume for A/F sensor operation using the intelligent tester.
  1. Connect the intelligent tester to the DLC3.
  2. Start the engine and turn the tester on.
  3. Warm up the engine at an engine speed of 2500 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. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume.)
  6. Monitor the output voltages of the A/F and HO2 sensors (AFS Voltage B1 S1 and O2S B1 S2) displayed on the tester.
HINT:
  1. The Control the Injection Volume for A/F sensor operation decreases the fuel injection volume by 12.5% or increases the injection volume by 25%.
  2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display (Sensor)
Injection Volume
Status
Voltage
AFS Voltage B1 S1
(A/F)
+25%
Rich
Below 3.1 V
AFS Voltage B1 S1
(A/F)
-12.5%
Lean
Higher than 3.4 V
O2S B1 S2
(HO2)
+25%
Rich
Higher than 0.55 V
O2S B1 S2
(HO2)
-12.5%
Lean
Below 0.4 V
NOTICE:
The air fuel ratio 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
HO2 Sensor (Sensor 2) Output Voltage
Main Suspected Trouble Area
1
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
-
2
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
  1. A/F sensor
  2. A/F sensor heater
  3. A/F sensor circuit
3
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
  1. HO2 sensor
  2. HO2 sensor heater
  3. HO2 sensor circuit
4
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
  1. Injector
  2. Fuel pressure
  3. Gas leak from exhaust system (Air fuel ratio extremely rich or lean)
  1. Following the Control the Injection Volume for A/F sensor procedure enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.
  2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1 S1 and O2S B1 S2.
HINT:
  1. DTC P2A00 may be stored when the air fuel ratio is stuck rich or lean.
  2. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
  3. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
  4. 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.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTCs.

    Result
    Result
    Proceed to
    DTC P2A00 is output
    A
    DTC P2A00 and other DTCs are output
    B
    HINT:
    If any DTCs relating to the A/F sensor (DTCs for the A/F sensor heater or A/F sensor admittance) are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (RAV4_ACA30 RM000000PDF07OX.html)
A


2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System.
Dtc
  P2A00  A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)
  1. Disconnect the air fuel ratio sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    1 (HA1A) - 2 (+B)
    20°C (68°F)
    1.8 to 3.4 Ω
    1 (HA1A) - 4 (A1A-)
    Always
    10 kΩ or higher
    Text in Illustration
    *1
    Component without harness connected
    (Air Fuel Ratio Sensor)
  1. Reconnect the air fuel ratio sensor connector.



NG
REPLACE AIR FUEL RATIO SENSOR (RAV4_ACA30 RM000002WUR027X.html)
OK


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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System.
Dtc
  P2A00  A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)
  1. Disconnect the air fuel ratio sensor connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    Condition
    Specified Condition
    B113-2 (+B) - Body ground
    Ignition switch ON
    11 to 14 V
  1. Turn the ignition switch off.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    Condition
    Specified Condition
    B113-3 (A1A+) - B32-103 (A1A+)
    Always
    Below 1 Ω
    B113-4 (A1A-) - B32-126 (A1A-)
    Always
    Below 1 Ω
    B113-1 (HA1A) - B32-104 (HA1A)
    Always
    Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    Condition
    Specified Condition
    B113-3 (A1A+) or B32-103 (A1A+) - Body ground
    Always
    10 kΩ or higher
    B113-4 (A1A-) or B32-126 (A1A-) - Body ground
    Always
    10 kΩ or higher
    B113-1 (HA1A) or B32-104 (HA1A) - Body ground
    Always
    10 kΩ or higher
    Text in Illustration
    *1
    Front view of wire harness connector
    (to Air Fuel Ratio Sensor)
    *2
    Front view of wire harness connector
    (to ECM)
  1. Reconnect the ECM connector.

  1. Reconnect the air fuel ratio sensor connector.



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


4.PERFORM CONFIRMATION DRIVING PATTERN

NEXT


5.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTCs.

    Result
    Result
    Proceed to
    DTC P2A00 is output
    A
    DTC is not output
    B


B
CHECK FOR INTERMITTENT PROBLEMS (RAV4_ACA30 RM000000PDQ0BAX.html)
A


6.REPLACE AIR FUEL RATIO SENSOR
  1. Replace the air fuel ratio sensor (RAV4_ACA30 RM000002WUR027X.html).


NEXT


7.PERFORM CONFIRMATION DRIVING PATTERN

NEXT


8.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTCs.

    Result
    Result
    Proceed to
    DTC is not output
    A
    DTC P2A00 is output
    B


B
REPAIR OR REPLACE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (RAV4_ACA30 RM000000WC308QX.html)
A

END