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:
Programming HomeLink
■ Before programming
HomeLink
During programming, it is possible
that garage doors,
gates, or other devices may
operate. For this reason,
make sure that people and
objects are clear of the
garage door or other devices
to prevent injury or other
potential harm.
It is recommended that a n ...
Selecting the driving mode
The following modes can be selected to suit driving conditions.
Eco drive mode
Use eco drive mode to help achieve low fuel consumption during
trips that involve frequent accelerating.
Press the “eco mode” button
to select eco drive mode.
The “eco mode” indicator
comes on.
Press t ...
Terminals of ecu
Check instrument panel junction block (main body ecu)
Disconnect the ib and ie junction block connectors.
Measure the voltage and resistance of the wire
harness side connectors.
Reconnect the ib and ie junction block connector.
Measure the voltage of the wire harness ...
