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:
Forward clutch
Components
Disassembly
Inspect forward clutch (see page ax-227)
Remove forward multiple disc clutch disc
Using a screwdriver, remove the snap ring.
Remove the flange , 5 discs and 5 plates from the
input shaft.
Inspect forward multiple disc clutch disc (see page ax-228 ...
Data list / active test
Read data list
Hint:
Using the intelligent tester's data list allows switch,
sensor, actuator and other item values to be read without
out removing any parts. Reading the data list early in
troubleshooting is one way to save time.
Connect the intelligent tester (with can vim) to the
...
How to proceed with troubleshooting
Hint:
Use these procedures to troubleshoot the supplemental
restraint system.
*: Use the intelligent tester.
Vehicle brought to workshop
Inspect battery voltage*
Standard voltage:
11 to 14 v
If the voltage is below 11 v, recharge or replace the battery
before proceeding.
...
