Nissan Frontier D22. Instruction — part 182
GENERAL INFORMATION
BRC-59
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
System Diagram
EFS003HX
LFIA0137E
BRC-60
[VDC/TCS/ABS]
CAN COMMUNICATION
CAN COMMUNICATION
PFP:23710
System Description
EFS003HY
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic 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.
SYSTEM DIAGRAM
Input/output signal chart
T: Transmit R: Receive
LFIA0138E
Signals
ECM
Steering angle
sensor
ABS actuator and
electric unit (con-
trol unit)
TCM
Engine speed signal
T
R
Accelerator pedal position signal
T
R
R
Steering angle sensor signal
T
R
TROUBLE DIAGNOSIS
BRC-61
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
TROUBLE DIAGNOSIS
PFP:00004
How to Proceed With Diagnosis
EFS003HZ
BASIC CONCEPT
●
Most important point to perform diagnosis is to understand systems (control and mechanism) in vehicle
thoroughly.
●
It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
NOTE:
Customers are not professionals. Do not assume “maybe cus-
tomer means...” or “maybe customer mentioned this symptom”.
●
It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
●
After diagnosis, make sure to carry out “erase memory”. Refer to
●
For an intermittent malfunction, move harness or harness con-
nector by hand to check poor contact or false open circuit.
●
Always read “GI General Information” to confirm general precautions.
SEF234G
SEF233G
BRC-62
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
DIAGNOSIS FLOWCHART
LFIA0182E
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