Nissan Altima (L32) 2007-2012 Service Manual: Can communication system
System Description
• CAN communication is a multiplex communication system. This enables the
system to transmit and receive
large quantities of data at high speed by connecting control units with two
communication lines (CAN-H and
CAN-L).
• Control units on the CAN network transmit signals using the CAN communication
control circuit. They
receive only necessary signals from other control units to operate various
functions.
• CAN communication lines adopt twisted-pair line style (two lines twisted) for
noise immunity.
System Diagram
Each control unit passes an electric current to the termination circuits when
transmitting CAN communication
signal. The termination circuits produce an electrical potential difference
between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the
potential difference.
CAN Communication Control Circuit
*: These are the only control units wired with both ends of CAN communication
system.
Description
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1
and DDL2 communication
lines, between control units and diagnosis unit.
System Diagram
...
Function diagnosis
Diag on can