Toyota RAV4 (XA40) 2013-2018 Service Manual: Control module communication bus off
Description
Inspection procedure
The skid control ecu inputs the signals from the ecm, steering angle sensor, and yaw rate and acceleration sensor via can communication system.
- Check harness and connector (momentary interruption)
- Using the data list of the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a dtc (see page bc-23).
Result 
Hint:
Perform the above inspection before removing the sensor and connector.
- Check if each sensor and ecm connector is securely connected
- Check if each sensor or ecm connector is securely connected.
Ok: the connector should be securely connected.
- Reconfirm dtc
- Record the output dtcs (for abs, vsc and can communication) (see page bc-47).
Hint:
If the can communication system dtc and the relevant sensor dtcs are output simultaneously, troubleshoot the relevant sensor dtcs (for abs and vsc) after the can communication system returns to normal.
Result 
Inspect can communication system
- Repair or replace harness and connector
- Repair or replace the harness or connector.
- Check for any momentary interruption between the skid control ecu and each sensor or ecm (see page bc-23).
- Check that there is no momentary interruption.
- Reconfirm dtc
- Clear the dtc (see page bc-47).
- Turn the ignition switch on.
- Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.
- Check that no can communication system dtc is output (see page bc-47).
- If abs and/or vsc dtcs are output, record them.
Result 
Hint:
The can communication system must be normal when repairing the sensor dtcs (for abs and vsc).
Inspect can communication system
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 ...
Abs warning light remains on
Description
If any of the following conditions are detected, the abs warning light
remains on:
The ecu connectors are disconnected from the skid control ecu.
There is a malfunction in the ski ...
Other materials:
Engine compartment
Engine coolant reservoir
Engine oil filler cap
Battery
Brake fluid reservoir
Fuse box
Radiator
Condenser
Electric cooling fans
Engine oil level dipstick
Washer fluid tank
Engine oil
With the engine at operating temperature and turned off, check the oil
level on the dips ...
Front axle hub bolt
Components
Replacement
Hint
Use the same procedures for the rh side and lh side.
The procedures listed below are the lh side.
Remove front wheel
Remove front disc brake cylinder
assembly lh (see page br-40)
Remove front disc (see page br-42)
Remove front axle hub bolt
...
Vsc warning light remains on
Description
The skid control ecu is connected to the combination meter via the can
communication system.
W/o multi information display:
if the skid control ecu stores any dtcs which relate to the vsc system, the vsc
warning light comes on
in the combination meter.
W/ multi information d ...
