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:
Fuel injector
Components
Removal
Discharge fuel system pressure
Caution:
Discharge fuel system pressure
procedures must be performed before
disconnecting any part of the fuel system.
After performing the discharge fuel system
pressure procedures, pressure will remain in
the fuel line ...
Components (2005/11-2006/01)
Sliding roof ecu power source circuit
Description
If the sliding function and tilt function do not operate, there may be a
malfunction in the sliding roof ecu
power source circuit.
Wiring diagram
Inspection procedure
Perform active test by i ...
Identification information
Vehicle identification and serial numbers
Vehicle identification number
The vehicle identification number is stamped on the
vehicle identification number plate and on the
certification label, as shown in the illustrations.
Vehicle identification number plate
Certification label ...