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:
If the electronic key does
not operate properly (vehicles
with smart key system)
If communication between
the electronic key and vehicle
is interrupted or the electronic key cannot
be used because the battery
is depleted, the smart key
system and wireless remote
control cannot be used. In
such cases, the doors can
be opened and the engine
can be started by following
the procedur ...
Diagnosis system
Description
The occupant classification ecu controls the functions of
the occupant classification system on the vehicle. Data
of the occupant classification system can be read in the
data link connector 3 (dlc3) of the vehicle. When the
system seems to be malfunctioning, use the intelligen ...
Lubrication system
On-vehicle inspection
Check engine oil level
Warm up the engine, stop the engine and wait for 5
minutes.
Check that the engine oil level is between the l and
f marks of the oil dipstick.
If low, check for leakage and add oil up to the f
mark.
Notice:
Do not add engine oil a ...
