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

Двигатель. Toyota Rav4. Aca30, 33, 38 Ala30
Система Управления Двигателем 2Az-Fe. Toyota Rav4. Aca30, 33, 38 Ala30

DESCRIPTION

MONITOR 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 (ECM - AIR-FUEL RATIO SENSOR)

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)

УКАЗАНИЕ:
Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.

DESCRIPTION

Refer to DTC P2195 (see page RAV4_ACA30 RM000000WC4017X_01.html).

DTC No.
DTC Detection Condition
Trouble Area
P2A00
Calculated value of air-fuel ratio (A/F) sensor response rate deterioration level less than threshold
(2 trip detection logic)
  1. Open or short in A/F sensor circuit
  2. A/F sensor
  3. ECM

MONITOR DESCRIPTION

After the engine is warmed up, the ECM performs air-fuel ratio feedback control to maintain the air-fuel ratio at the stoichiometric level. In addition, active A/F control is performed for approximately 10 seconds after the preconditions are met in order to measure the A/F sensor response rate. During active A/F control, the ECM forcibly increases and decreases the injection volume a certain amount, based on the stoichiometric air-fuel ratio learned during normal air-fuel ratio control, and measures the A/F sensor response rate. The ECM receives a signal from the A/F sensor while performing active A/F control and uses it to calculate the A/F sensor response rate deterioration level.
If the A/F sensor response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and sets the DTC.

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)


CONFIRMATION DRIVING PATTERN

УКАЗАНИЕ:
Performing this confirmation pattern will activate the A/F sensor response monitor.

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)


  1. Toyota Rav4. Aca30, 33, 38 Ala30
    (a) Connect the intelligent tester to the DLC3.
  2. (b) Turn the ignition switch on (IG).
  3. (c) Turn the tester ON.
  4. (d) Clear DTCs (if set) (see page RAV4_ACA30 RM000000PDK013X.html).
  5. (e) Select the following menu items: Powertrain / Engine and ECT / Data List / Monitor Status.
  6. (f) Check that O2S(A/FS) Monitor is Incmpl.
  7. (g) Start the engine and warm it up.
  8. (h) Drive the vehicle at a constant speed of between 25 mph and 75 mph (40 km/h and 120 km/h) for 3 minutes.
  9. (i) Check that the status of the O2S(A/FS) Monitor is Compl.
  10. (j) Select the following menu items: Powertrain / Engine and ECT / DTC.
  11. (k) Check if any DTCs (any pending DTCs) are set.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)


INSPECTION PROCEDURE

УКАЗАНИЕ:
Intelligent tester only:
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. (a) Connect the intelligent tester to the DLC3.
  2. (b) Start the engine and turn the tester ON.
  3. (c) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
  4. (d) On the tester, select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
  5. (e) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
  6. (f) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1 S1 and O2S B1 S2) displayed on the tester.
    УКАЗАНИЕ:
    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%.
    2. The sensors react in accordance with increases and decreases in the fuel injection volume.

      Standard:

      Tester Display
      (Sensor)
      		Injection Volume
      		Status
      		Voltage
      AFS B1 S1
      (A/F)
      		+25%
      		Rich
      		Less than 3.0
      -12.5%
      		Lean
      		More than 3.35
      O2S B1 S2
      (HO2)
      		+25%
      		Rich
      		More than 0.5
      -12.5%
      		Lean
      		Less than 0.4
ПРИМЕЧАНИЕ:
The A/F sensor has an output delay of a few seconds and the HO2 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
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
-
Output Voltage
More than 3.35 V
Less than 3.0 V
Toyota Rav4. Aca30, 33, 38 Ala30
Output Voltage
More than 0.5 V
Less than 0.4 V
Toyota Rav4. Aca30, 33, 38 Ala30
2
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
  1. A/F sensor
  2. A/F sensor heater
  3. A/F sensor circuit
Output Voltage
Almost
no reaction
Toyota Rav4. Aca30, 33, 38 Ala30
Output Voltage
More than 0.5 V
Less than 0.4 V
Toyota Rav4. Aca30, 33, 38 Ala30
3
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
  1. HO2 sensor
  2. HO2 sensor heater
  3. HO2 sensor circuit
Output Voltage
More than 3.35 V
Less than 3.0 V
Toyota Rav4. Aca30, 33, 38 Ala30
Output Voltage
Almost
no reaction
Toyota Rav4. Aca30, 33, 38 Ala30
4
Injection volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
Injection Volume
+25%
-12.5%
Toyota Rav4. Aca30, 33, 38 Ala30
  1. Injector
  2. Fuel pressure
  3. Gas leakage from exhaust system
(Air-fuel ratio extremely lean or rich)
Output Voltage
Almost
no reaction
Toyota Rav4. Aca30, 33, 38 Ala30
Output voltage
Almost
no reaction
Toyota Rav4. Aca30, 33, 38 Ala30
  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, select the following menu items on the tester: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Enter / View / AFS B1 S1 and O2S B1 S2.
УКАЗАНИЕ:
  1. DTC P2A00 may be set when the air-fuel ratio is stuck rich or lean.
  2. A low A/F 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 A/F 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. Freeze frame data records the engine condition when malfunctions are detected. 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 on (IG).

  1. Turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:

    Display (DTC Output)
    		Proceed to
    P2A00
    		A
    P2A00 and other DTCs
    		B
    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
A


2.INSPECT AIR-FUEL RATIO SENSOR (HEATER RESISTANCE)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

  1. Disconnect the B7 A/F sensor connector.

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

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

  1. Reconnect the A/F sensor connector.



NG
REPLACE AIR-FUEL RATIO SENSOR
OK


3.CHECK HARNESS AND CONNECTOR (ECM - AIR-FUEL RATIO SENSOR)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

  1. Disconnect the B7 A/F sensor connector.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the +B terminal of the A/F sensor connector and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    +B (B7-2) - Body ground
    		9 to 14 V

  1. Turn the ignition switch off.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    HA1A (B7-1) - HA1A (B32-109)
    		Below 1 Ω
    A1A+ (B7-3) - A1A+ (B32-112)
    		Below 1 Ω
    A1A- (B7-4) - A1A- (B32-113)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    HA1A (B7-1) or HA1A (B32-109) - Body ground
    		10 kΩ or higher
    A1A+ (B7-3) or A1A+ (B32-112) - Body ground
    		10 kΩ or higher
    A1A- (B7-4) or A1A- (B32-113) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.



  1. Reconnect the A/F sensor connector.


    Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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 on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read pending DTCs.

    Result:

    Display (DTC Output)
    		Proceed to
    P2A00
    		A
    No 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 (DTC P2A00)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read pending DTCs.

    Result:

    Display (DTC Output)
    		Proceed to
    No output
    		A
    P2A00
    		B


B
REPLACE ECM
A

END