Toyota RAV4 manuals

Toyota Sienna Service Manual: A/F Sensor Circuit Slow Response

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

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

HINT:

DESCRIPTION

Refer to DTC P2195

DESCRIPTION

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 ratio control is performed for approximately 10 seconds after preconditions are met in order to measure the A/F sensor response rate. During active A/F ratio control, the ECM forcibly increases and decreases the injection volume to 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 ratio control and uses it to calculate the A/F sensor response rate deterioration level.

If the value for A/F sensor response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and sets the DTC.

MONITOR DESCRIPTIO

CONFIRMATION DRIVING PATTERN

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

CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to the ON position.
  3. Turn the tester on.
  4. Clear the DTCs (where set).
  5. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR RESULT.
  6. Check that RES RATE B1S1 and RES RATE B2S1 is INCOMPL.

CONFIRMATION DRIVING PATTERN

  1. Start the engine and warm it up (Procedure "A").
  2. Drive the vehicle at between 25 mph and 75 mph (40 km/h and 120 km/h) for 3 minutes. However, the vehicle should be driven at a constant speed (Procedure "B").
  3. Check the monitor result values on the intelligent tester by selecting the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR RESULT /RES RATE B1S1 and RES RATE B2S1 / Enter.
  4.  If the values indicated on the tester do not change, perform READINESS MONITOR DRIVE PATTERN for the A/F sensor and the heated oxygen sensor.

    HINT: Completion of all A/F sensor monitors is required to change the value in test result.

  5.  Note the value of the Monitor Result.
  6.  Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
  7. Check if any DTCs (any pending DTCs) are set.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to CHECKING MONITOR STATUS.

WIRING DIAGRAM

Refer to DTC P2195.

INSPECTION PROCEDURE

HINT: Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL 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 A/F CONTROL operation using an 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.  Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/ F CONTROL.
  5.  Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
  6.  Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2) displayed on the tester.

HINT:

Standard voltage

Standard voltage

NOTICE: The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.

INSPECTION PROCEDURE

Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.

To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2. Press the YES button and then the ENTER button. Then press the F4 button.

HINT:

1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Turn the tester on.
  4.  Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
  5.  Read the DTCs.

Result

Result

HINT: If any DTCs other than P2A00 or P2A03 are output, troubleshoot those DTCs first.

2 INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

 INSPECT AIR FUEL RATIO SENSOR

  1. Disconnect the A5 or A6 A/F sensor connector.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance: Bank 1

Standard resistance

Bank 2

Standard resistance

  1. Reconnect the A/F sensor connector.

Result

Result

3 CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

CHECK HARNESS AND CONNECTOR

  1. Disconnect the A5 or A6 A/F sensor connector.
  2.  Turn the ignition switch to the ON position.
  3.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

  1. Turn the ignition switch off.
  2.  Disconnect the E10 ECM connector.
  3.  Measure the resistance according to the value(s) in the table below.

Standard resistance: Check for open

Standard resistance

Check for short

Check for short

  1. Reconnect the ECM connector.
  2.  Reconnect the A/F sensor connector.

CHECK HARNESS AND CONNECTOR

4 PERFORM CONFIRMATION DRIVING PATTERN

5 CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

  1. Read the DTCs using the intelligent tester.
  2. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

Result

Result

6 REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (for 2WD model or 4WD model

7 PERFORM CONFIRMATION DRIVING PATTERN

8 CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

  1. Read the DTCs using the intelligent tester.
  2. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

Result

Result

END

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