Toyota RAV4 Service Manual: System description
- Brief description
- The can (controller area network) is a serial data
communication system for real time application. It is
a vehicle multiplex communication system which
has a high communication speed (500 kbps) and
the ability to detect malfunctions.
- By pairing the canh and canl bus lines, the can
performs communication based on differential
voltages.
- Many ecus (sensors) installed on the vehicle
operate by sharing information and communicating
with each other
- The can has 2 resistors of 120 ù which are
necessary to communicate with the main wire.
- Definition of terms
- Main wire
- The main wire is a wire harness between the 2
terminus circuits on the bus (communication
line). This is the main bus in the can
communication system.
- Branch wire
- The branch wire is a wire harness which
diverges from the main wire to an ecu or
sensor.
- Terminus circuit
- The terminus circuit is a circuit which converts
the communication current of the can
communication into the bus voltage. It consists
of a resistor and condenser. 2 Terminus circuits
are necessary on a bus.
- Can j/c
The can j/c is a junction designed for can
communication, which contains a terminus
circuit.
- Ecu or sensor which communicate via can communication system
- Abs and traction actuator (skid control ecu)
- Power steering ecu
- Steering angle sensor
- Yaw rate sensor
- Ecm
- Center airbag sensor
- Air conditioning amplifier
- Combination meter ecu
- Main body ecu
- 4Wd control ecu*
Hint:
*: For 4wd
- Diagnostic codes for can communication
system
- Dtcs for the can communication system are as
follows: u0073, u0100, u0105, u0121, u0122,
u0123, u0124, u0126, u0129, c1280, c1296,
c1297, and b1499.
- Notes regarding troubleshooting
- Trouble in the can bus (communication line) can be
checked through the dlc3 (except when there is a
wire break other than in the branch wire of the
dlc3).
Notice:
Do not connect the tester directly to the dlc3
connector. Be sure to use a service wire.
- Dtcs regarding the can communication system
can be checked using the intelligent tester.
- The can communication system cannot detect
trouble in the branch line of the dlc3 even though
the dlc3 is also connected to the can
communication system.
System diagram
Hint:
The abs and traction actuator (skid control ecu)
detects and stores steering sensor and yaw rate
sensor dtcs and performs dtc communication by
receiving ...
Notice:
Dtcs for the can communication system are as
follows: u0073, u0100, u0105, u0121, u0122, u0123,
u0124, u0126, u0129, c1280, c1296, c1297, and
b1499.
Refer to the troubleshooting pr ...
Other materials:
USB connection
General information
The following mobile devices can be connected
to the USB port:
Mobile phones.
Audio devices such as MP3 players.
USB storage devices.
Common file systems are supported. FAT32
and exFAT are the recommended formats.
A connected USB storage device will be supplied
with charge c ...
Engine (ignition) switch
(vehicles without a
smart key system)
Starting the engine
Check that the parking brake is set.
Check that the shift lever is set in p.
Firmly depress the brake pedal.
Turn the engine switch to the “start” position to start the engine.
Changing the engine switch positions
“Lock”
The steering wheel is locked an ...
Rear upper control arm
Components
Removal
Hint:
Use the same procedures for the rh side and lh side.
The procedures listed below are for the lh side.
Remove rear wheel
Disconnect skid control sensor wire (for
2wd) (see page bc-198)
Disconnect rear speed sensor lh (for 4wd)
(see page bc-205)
Rem ...