Toyota RAV4 (XA40) 2013-2018 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:
Intake air temperature circuit malfunction
Description
The intake air temperature (iat) sensor, mounted on the mass air flow (maf)
meter, monitors the iat.
The iat sensor has a built-in thermistor with a resistance that varies according
to the temperature of the
intake air. When the iat is low, the resistance of the thermist ...
Lost communication with front satellite sensor bus lh
Description
The front airbag sensor lh consists of the diagnostic circuit and the frontal
deceleration sensor.
If the center airbag sensor receives signals from the frontal deceleration
sensor, it determines whether or
not the srs should be activated.
Dtc b1607/84, b1608/84, b1617/84 ...
Using the aux port
This port can be used to connect a portable audio device and listen
to it using the vehicle’s speakers.
Open the cover and connect
the portable audio device.
Press the “media” button repeatedly until “aux” is displayed.
Silencing a sound
Press
(mute).
To cancel, p ...