Component parts
Component parts location
System
Can communication system
Can communication system : system description
System diagram
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.
Can communication signal generation
Note:
A signal with no current passage is called “recessive” and one with current passage is called “dominant”.
The construction of can communication signal (message)
Can communication line
The can communication line is a twisted pair wire consisting of strands of can-h (1) and can-l (2) and has noise immunity.
Note:
The can communication system has the characteristics of noise-resistant because this system produces digital 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 (1) occurs. Although the noise changes the voltage, the potential difference (2) 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 control circuit included in the control unit and receives only necessary signals from each control unit to perform various kinds of control.
Note:
The above signal names and signal communications are provided for reference purposes. For can communications signals of this vehicle, refer to lan-30, "can communication system : can communication signal chart".
Can communication system : can communication control circuit
Can communication control circuit is incorporated into the control unit and transmits/receives can communication signals.
Component | System description |
Can controller | It controls can communication signal transmission and reception, error detection, etc. |
Transceiver ic | It converts digital signal into CAN communication signal, and CAN communication signal into digital signal. |
Noise filter | It eliminates noise of can communication signal. |
Termination circuit* (resistance of approx. 120 ) | Generates a potential difference between CAN-H and CAN-L. |
*: These are the only control units wired with both ends of CAN communication system.
Can communication system : can system specification chart
Determine CAN system type from the following specification chart.
Note:
Refer to lan-16, "trouble diagnosis procedure" for how to use can system specification chart.
×: applicable
Vehicle equipment identification information
Note:
Check CAN system type from the vehicle shape and equipment.
Can communication system : can communication signal chart
Refer to lan-15, "how to use can communication signal chart" for how to use can communication signal chart.
Note:
*1: With battery current sensor (with battery temperature sensor)
*2: M/t models
Basic inspection
Diagnosis and repair workflow
Workflow
OVERALL SEQUENCE
DETAILED FLOW
1.INTERVIEW CUSTOMER
Interview the customer to obtain as much information as possible about the
conditions and environment under
which the malfunction occurred.
>> GO TO 2.
2.SYMPTOM CHECK
Verify symptoms.
...
Car phone or CB radio
When installing a CB, ham radio or car phone in
your vehicle, be sure to observe the following
precautions; otherwise, the new equipment may
adversely affect the engine control system and
other electronic parts.
WARNING
A cellular phone should not be used for
any purpose while dr ...
Using the system
The NISSAN Voice Recognition system allows
hands-free operation of the Bluetooth® Phone
System.
If the vehicle is in motion, some commands may
not be available so full attention may be given to
vehicle operation.
Initialization
When the ignition switch is placed in the ON
position, NISSAN ...