Toyota RAV4 (XA40) 2013-2018 Service Manual: Low battery positive voltage
Description
When there is an abnormality in the power supply circuit of the brake actuator (skid control ecu), the skid control ecu sets a dtc and the operation is prohibited by the fail-safe function. This dtc is set when the voltage supplied to terminal ig1 is outside the dtc detection threshold, due to abnormalities of the battery, power source circuits or charging circuits such as the alternator circuit.
The fail-safe function is canceled when the voltage to terminal ig1 returns to normal.
Wiring diagram
Inspection procedure
- Inspect fuse (ecu-ig1)
- Remove the ecu-ig1 fuse from the instrument panel junction block.
- Measure the resistance of the fuse.
Standard resistance:
below 1 
- Inspect battery
- Check the battery voltage.
Standard voltage: 11 to 14 v
- Check wire harness (skid control ecu - battery)
- Disconnect the a19 ecu connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Check wire harness (skid control ecu - body ground)
- Disconnect the a19 ecu connector.
- Measure the resistance of the wire harness side connector.
Standard resistance 
- Reconfirm dtc
- Clear the dtc (see page bc-47).
- Drive the vehicle at 3 km/h (2 mph) or more for several seconds.
- Check if the same dtc is output (see page bc-47).
Result 
Replace abs and traction actuator assembly
Stuck in deceleration sensor
Description
The skid control ecu receives signals from the yaw rate and deceleration
sensor via the can
communication system.
The yaw rate sensor has a built-in deceleration sensor and dete ...
Master cylinder pressure sensor malfunction
Description
The master cylinder pressure sensor is connected to the skid control ecu in
the abs and traction
actuator.
Dtc c1281/81 can be detected when the master cylinder pressure sensor ...
Other materials:
Abnormal temperature inside
Description
The tire pressure warning valve and transmitter measures tire internal
temperature as well as tire
pressure, and transmits the information to the tire pressure monitor receiver
along with the transmitter id.
If the measured temperature is out of the specified range, the tire ...
Axle system
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 th ...
Blower resistor
On-vehicle inspection
Inspect blower motor control
Measure the resistance of the blower resistor.
Standard resistance
If the resistance is not as specified, replace the
blower motor control. ...
