Toyota RAV4 Service Manual: Air fuel ratio sensor
Components

On-vehicle inspection
- Check air fuel ratio compensation system

- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on.
- Select the following menu items: data list / a/fs b1
s1 and o2s b1 s2.
- Warm up the a/f sensor with the engine speed at
2,500 rpm for approximately 2 minutes.
- 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.
- Confirm that the display of "o2s b1 s2" changes
between 0 to 1 v with the engine speed at 2,500
rpm.

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
- 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.
- Remove air fuel ratio sensor (for bank 1 sensor 1)
- Disconnect the sensor connector.
- Using sst, remove the sensor from the exhaust
manifold.
Sst 09224-00010

Inspection
- Inspect air fuel ratio sensor (for bank 1 sensor 1)

- Measure the resistance of the sensor.
Standard resistance 
If the resistance is not as specified, replace the
sensor.
Installation

- Install air fuel ratio sensor (for bank 1 sensor 1)
- 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.
- Connect the sensor connector.
- Connect cable to negative battery
terminal
- Check for exhaust gas leaks
Components
Removal
Remove no. 1 Engine cover (see page em-22)
Remove ventilation valve sub-assembly
Disconnect the ventilation hose from the ventilation
valve.
Using a ...
Components
Removal
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent ai ...
Other materials:
BMW Accident Assistance
Concept
BMW Group Accident Assistance can be contacted
if assistance is needed in the event of an
accident.
General information
If the vehicle sensors detect a minor to moderately
severe accident, which did not trigger any
airbags, a Check Control message appears on
the instrument cluster. In additi ...
Monitor drive pattern
Test monitor drive pattern for ect
Caution:
Perform this drive pattern on a level surface and
strictly observe the posted speed limits and traffic
laws while driving.
Hint:
Performing this drive pattern is one method to simulate
the ect's malfunction detection conditions.
The dtcs may ...
Problem symptoms table
Hint:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms
are listed in order of probability in the "suspected area"
column of the table. Check each symptom by checking the
suspected areas in the order they are listed. Re ...