Toyota RAV4 manuals

Toyota RAV4 Service Manual: Control module communication bus off

Toyota RAV4. Control module communication bus off


Description

Toyota RAV4. Control module communication bus off


Toyota RAV4. Control module communication bus off


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.

  1. Check harness and connector (momentary interruption)

  1. 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).

Toyota RAV4. Check harness and connector (momentary interruption)


Result


Hint:

Perform the above inspection before removing the sensor and connector.



  1. Check if each sensor and ecm connector is securely connected

  1. Check if each sensor or ecm connector is securely connected.

Ok: the connector should be securely connected.



  1. Reconfirm dtc

  1. 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

  1. Repair or replace harness and connector

  1. Repair or replace the harness or connector.
  2. Check for any momentary interruption between the skid control ecu and each sensor or ecm (see page bc-23).
  3. Check that there is no momentary interruption.


  1. Reconfirm dtc

  1. Clear the dtc (see page bc-47).
  2. Turn the ignition switch on.
  3. Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.
  4. Check that no can communication system dtc is output (see page bc-47).
  5. 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:

Disassembly
Remove idler pulley (see page em-23) Remove oil dipstick Remove oil dipstick guide (see page em-57) Remove manifold stay (see page em-57) Remove no. 2 Manifold stay (see page em-58) Remove no. 1 Exhaust manifold heat insulator (see page em-58) Remove exhaust manifold converter subas ...

Seat belt pretensioners (front seats)
The pretensioners help the seat belts to quickly restrain the occupants by retracting the seat belts when the vehicle is subjected to certain types of severe frontal or side collision or a vehicle rollover. The pretensioners do not activate in the event of a minor frontal impact, a minor ...

Coolant thermostat (coolant temperature below thermostat regulating temperature)
Hint: This dtc relates to the thermostat. Description This dtc is set when the engine coolant temperature (ect) does not reach 75°c (167°f) despite sufficient engine warm-up time having elapsed. Monitor description The ecm estimates the ect based on the starting temperature, en ...

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