Toyota RAV4 Quiz
2Az-fe emission control

Air fuel ratio sensor

In this manual: 2Az-fe emission control
Introduction — 37Interior — 12Exterior — 432Az-fe engine mechanical — 1552Az-fe ignition — 182Az-fe charging — 232Az-fe emission control — 82az-fe exhaust — 32Az-fe fuel — 72Az-fe lubrication — 4Brake — 17Brake control — 63U140f automatic transaxle — 59Instrument panel — 8Suspension — 18Drive shaft — 23Axle — 6Tire and wheel — 30Air conditioning — 93Lighting — 45Cruise control — 21Differential — 12Door lock — 31Engine immobiliser — 21Horn — 5Can communication — 27Mirror — 5Parking brake — 5Power steering — 27Propeller shaft — 3Seat — 29Seat belt — 27Sliding roof — 25Steering column — 6Wiper and washer — 11Supplemental restraint system — 95Other system — 5Maintenance — 14
13steps
~83min
4/5difficulty
1special tools
Done 0 of 13
Components
Toyota RAV4. Air fuel ratio sensor

On-vehicle inspection
  1. Check air fuel ratio compensation system
Toyota RAV4. Check air fuel ratio compensation system

  1. Connect the intelligent tester to the dlc3.
  2. Turn the ignition switch on.
  3. Select the following menu items: data list / a/fs b1 s1 and o2s b1 s2.
  4. Warm up the a/f sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
  5. Keep the engine speed at 2,500 rpm and confirm that the display of "a/fs b1 s1" is as shown in the illustration.
Hint:
  • The illustration may slightly differ from the display on the intelligent tester.
  • Only the intelligent tester displays the waveform of the a/f sensor.
  1. Confirm that the display of "o2s b1 s2" changes between 0 to 1 v with the engine speed at 2,500 rpm.
Toyota RAV4. Check air fuel ratio compensation system

Ok: the voltage output oscillates more than 8 times in 10 seconds. Notice:
  • Perform the check immediately after warming the engine up.
  • If the voltage variation could not be verified, warm up the a/f sensor again. If it could not be verified even after warming up the sensor again, check for dtcs (see page es-292).
Removal
  1. Disconnect cable from negative battery terminal
Caution: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
  1. Remove air fuel ratio sensor (for bank 1 sensor 1)
  2. Disconnect the sensor connector.
  3. Using sst, remove the sensor from the exhaust manifold.
Sst 09224-00010
Toyota RAV4. Remove air fuel ratio sensor (for bank 1 sensor 1)

Inspection
  1. Inspect air fuel ratio sensor (for bank 1 sensor 1)
Toyota RAV4. Inspect air fuel ratio sensor (for bank 1 sensor 1)

  1. Measure the resistance of the sensor.
Standard resistance

If the resistance is not as specified, replace the sensor.

Installation
Toyota RAV4. Install air fuel ratio sensor (for bank 1 sensor 1)

  1. Install air fuel ratio sensor (for bank 1 sensor 1)
  2. Using sst, install the sensor to the exhaust manifold.
Sst 09224-00010 Torque: 40 n*m (408 kgf*cm, 30 ft.*Lbf) for use with sst 44 N*m (449 kgf*cm, 32 ft.*Lbf) for use without sst Hint:
  • Use a torque wrench with a fulcrum length of 30 cm (11.81 In.).
  • Make sure sst and wrench are connected in a straight line.
  1. Connect the sensor connector.
  2. Connect cable to negative battery terminal
  3. Check for exhaust gas leaks

Test yourself

A quick Toyota RAV4 quiz: every answer comes with an explanation and a link to the manual page.