Nissan Leaf. Instruction — part 892
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< SYSTEM DESCRIPTION >
[CAN]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000010120369
Air bag diagnosis sensor unit
AV control unit
A/C auto amp.
TCU
Around view monitor control unit
Approaching vehicle sound for pe-
destrians (VSP) control unit
ABS actuator and electric unit (con-
trol unit)
VCM
(Electric shift control module includ-
ed)
PDM (Power Delivery Module)
Traction motor inverter
Electrically-driven intelligent brake
unit
IPDM E/R
BCM
EPS control unit
Combination meter
Steering angle sensor
Data link connector
Li-ion battery
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< SYSTEM DESCRIPTION >
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SYSTEM
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM : System Description
INFOID:0000000010120370
SYSTEM DIAGRAM
NOTE:
VCM includes electric shift control module.
DESCRIPTION
• CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle
multiplex communication line with high data communication speed and excellent error detection ability. Many
electronic control units are equipped onto a vehicle, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with
less wiring. Each control unit transmits/receives data but selectively reads required data only.
• VCM includes a gateway function and communicates signals between the CAN communication circuit and
EV system CAN circuit. Refer to
.
CAN Communication Signal Generation
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< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
• Termination circuits (resistors) are connected across the CAN communication system. When transmitting a
CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to
the CAN-L line.
• The current flows separately into the termination circuits connected
across the CAN communication system and the termination cir-
cuits drop voltage to generate a potential difference between the
CAN-H line and the CAN-L line.
NOTE:
A signal with no current passage is called “Recessive” and one
with current passage is called “Dominant”.
• The system produces digital signals for signal communications, by
using the potential difference.
The Construction of CAN Communication Signal (Message)
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CAN COMMUNICATION LINE
The CAN communication line is a twisted pair wire consisting of
strands of CAN-H and CAN-L and has noise immunity.
NOTE:
The CAN communication system has the characteristics of noise-resistant because this system produces dig-
ital signals by using the potential difference between the CAN-H line and the CAN-L line and has the twisted
pair wire structure.
Since the CAN-H line and the CAN-L line are always adjacent to
each other, the same degree of noise occurs, respectively, when a
noise occurs. Although the noise changes the voltage, the poten-
tial difference between the CAN-H line and the CAN-L line is
insensitive to noise. Therefore, noise-resistant signals can be
obtained.
CAN SIGNAL COMMUNICATIONS
Each control unit of the CAN communication system transmits signals through the CAN communication con-
trol circuit included in the control unit and receives only necessary signals from each control unit to perform
various kinds of control.
No.
Message name
Description
1
Start of frame (1 bit)
Start of message.
2
Arbitration of field (11 bit)
Priorities of message-sending are shown when there is a pos-
sibility that multiple messages are sent at the same time.
3
Control field (6 bit)
Signal quantity in data field is shown.
4
Data field (0-64 bit)
Actual signal is shown.
5
CRC field (16 bit)
• The transmitting control unit calculates sending data in ad-
vance and writes the calculated value in a message.
• The receiving control unit calculates received data and judg-
es that the data reception is normal when the calculated val-
ue is the same as the value written in the sent data.
6
ACK field (2 bit)
The completion of normal reception is sent to the transmitting
control unit.
7
End of frame (7 bit)
End of message.
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