Toyota RAV4 (XA40) 2013-2018 Service Manual: Different diameter tire malfunction
Description
The skid control ecu measures the speed of each wheel by receiving signals from the speed sensor.
These signals are used for recognizing that all 4 wheels are operating properly. Therefore, all wheel signals must be equal.
Inspection procedure
- Check tire size
- Check the diameter of all 4 tires.
Ok: diameter of all 4 tires are equal.
- Check speed sensor rotor
- Remove the drive shaft, and check around the speed sensor rotor.
Ok: no scratches or foreign matter on the sensor tip.
- Check speed sensor
- Check the speed sensor circuit (see page bc-64 or bc- 70).
- Check wire harness (skid control ecu - each speed sensor)
- Check the speed sensor circuit (see page bc-69 or bc- 70).
- Reconfirm dtc
- Clear the dtcs (see page bc-47).
- Drive the vehicle at more than 20 km/h (12 mph) for more than 60 seconds.
- Check if the same dtcs are detected.
Result 
Replace abs and traction actuator assembly
Steering angle sensor zero point malfunction
Description
The skid control ecu learns the steering sensor zero point every time the
ignition switch is turned on and
the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 sec ...
Downhill assist control operation switch (test mode dtc)
Description
The downhill assist control switch is connected to the skid control ecu in
the abs and traction
actuator.
Dtc c1379/74 can be detected when the downhill assist control switch se ...
Other materials:
Display contents
Following information is displayed
on the multi-information
display.
Driving support system information
Displays recognized signs while the
RSA system (if equipped) is operating.
Displays an image when the following
systems are operating and a
menu icon other than is
selected:
LTA (Lane Traci ...
Engine coolant temperature circuit
Description
A thermistor, whose resistance value varies according to the ect, is built
into the engine coolant
temperature (ect) sensor.
The structure of the sensor and its connection to the ecm are the same as those
of the intake air
temperature (iat) sensor.
Hint:
When any of dtcs ...
Dtc check / clear
Check dtc
Dtcs which are stored in the ecm can be displayed
with the intelligent tester.
The intelligent tester can display pending dtcs and
current dtcs. Some dtcs are not stored unless a
malfunction is detected in consecutive driving
cycles. When a malfunction is detected ...
