Mazda 6. Manual — part 57
MULITIPLE COMMUNICATION SYSTEM
T–9
T
T
End Of Sie
CAN SIGNAL-CHART
A6E811155430T08
OUT: Output (sends signal)
IN: Input (receives signal)
End Of Sie
Signal
Multiplex module
PCM
ABS (ABS/TCS) HU/
CM or DSC HU/CM
Instrument cluster
Audio unit
(information
display)
Engine condition
OUT
IN
Torque reduction inhibit
OUT
IN
Engine speed
OUT
IN
IN
Wheel speed
(front left/front
right/rear left/
rear right)
With ABS (ABS/
TCS) or DSC
IN
OUT
OUT
IN
Without ABS
OUT
IN
TP
OUT
IN
ECT
OUT
IN
Travelled
distance
—
IN
OUT
MTX, without
ABS
OUT
IN
Fuel injection amount
OUT
IN
MIL condition
OUT
IN
Generator warning light conditions
OUT
IN
Engine displacement
OUT
IN
Number of cylinders
OUT
IN
Air induction type
OUT
IN
Fuel type and delivery
OUT
IN
Country
OUT
IN
Transmission/axle type
OUT
IN
Tire circumference (front/rear)
OUT
IN
Desired gear/Change lever
position
OUT
IN
IN
HOLD switch conditions
OUT
IN
Torque reduction request
IN
OUT
Brake system configuration (EBD/
ABS/TCS/DSC)
IN
OUT
IN
Brake system
status
ABS
IN
OUT
EBD/ABS/TCS/
DSC
OUT
IN
Brake system warning light
conditions (brake fluid level
sensor)
IN
OUT
ABS configuration
IN
IN
OUT
Drive information system switch
operation
IN
OUT
Drive information system display
OUT
IN
T–10
MULITIPLE COMMUNICATION SYSTEM
ON-BOARD DIAGNOSTIC FUNCTION
A6E811155430T09
Outline
•
The on-board diagnostic function is incorporated into the PCM, ABS (ABS/TCS) HU/CM (with ABS (ABS/
TCS)), DSC HU/CM (with DSC), and instrument cluster. This function can narrow down CAN system
malfunction locations.
•
The on-board diagnostic function consists of the following functions: a failure detection function, which detects
malfunctions in CAN system-related parts; a memory function, which stores detected DTCs; a self-malfunction
diagnostic function, which indicates system malfunctions using DTCs and warning lights; and a PID/data
monitoring function, which verifies the input/output condition of specific input/output signals being read out.
•
Using an SST (WDS or equivalent), DTCs can be read out and deleted, and the PID/data monitoring function
can be activated.
•
The CAN system has a fail-safe function. When a malfunction occurs in CAN system, the transmission module
sends a warning signal and the receiving module illuminates the warning light.
Block Diagram
.
Failure detection function
•
The failure detection function in each CAN system-related module detects malfunctions in input/output signals.
•
This function outputs the DTC for the detected malfunction to the DLC-2, and also sends the detected result to
the memory function and fail-safe function.
Fail-Safe Function
•
When the failure detection function determines that there is a malfunction, the fail-safe function illuminates a
warning light to advise the driver of the malfunction.
Memory Function
•
The memory function stores the DTC for the malfunction of input/output signals for related parts, as determined
by the failure detection function.
A6E8111T007
1
ABS (ABS/TCS) HU/CM or DSC HU/CM
2
Instrument cluster
3
Twist pair
Module
Fail-safe functionì®Ì§ä
PCM
•
MIL illuminated
•
ABS (ABS/TCS) HU/CM
(with ABS (ABS/TCS))
•
DSC HU/CM (with DSC)
•
ABS (ABS/TCS) suspended (with ABS (ABS/TCS))
•
DSC suspended (with DSC)
•
ABS warning light illuminated
•
DSC/TCS indicator light illuminated
•
DSC OFF light illuminated
•
TCS OFF light illuminated
Instrument cluster
•
Speedometer, tachometer, water temperature gauge: 0 displayed
•
MIL illuminated
•
ABS warning light illuminated
MULITIPLE COMMUNICATION SYSTEM
T–11
T
T
Self-Malfunction Diagnostic Function
•
The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC,
to the DLC-2. The DTC can be read out using an SST (WDS or equivalent).
DTC table
PID/Data Monitoring Function
•
The PID/data monitoring function is used to freely select and read out, in real time, the monitored items for the
input/output signals of the ABS (ABS/TCS) HU/CM, DSC HU/CM and instrument cluster.
•
An SST (WDS or equivalent) is used to read out the PID/data monitor information.
Narrowing Down Malfunction Locations
•
The on-board diagnostic function, by verifying the detected DTC and PID/data monitor information from each
module, can narrow down a CAN system malfunction location. Refer to the Self-Malfunction Diagnostic
Function and PID/Data Monitoring Function for detailed information regarding DTCs and the PID/data monitor.
(See
T–11 Self-Malfunction Diagnostic Function
.) (See
T–11 PID/Data Monitoring Function
DTC
Malfunction location
Related module
U0073
CAN system communication error
PCM
U0121
Communication error to ABS (ABS/TCS) HU/CM or DSC HU/CM
U0155
Communication error to instrument cluster
U1900
CAN system communication error
•
ABS (ABS/TCS) HU/CM
(vehicles with ABS (ABS/TCS))
•
DSC HU/CM (vehicles with DSC)
•
Instrument cluster
U2516
CAN system wiring harness open and short circuit
PID name (definition)
Condition
Specification
Related module
Terminal
IC_MSG
(Missing message from the
instrument cluster)
Present
Circuit in the Instrument cluster
is normal
ABS (ABS/TCS)
HU/CM or DSC HU/
CM
•
ABS (ABS/TCS)
HU/CM: O, R
•
DSC HU/CM: AF,
AG
•
Instrument cluster:
2W, 2X
Not Present
Circuit in the Instrument cluster
is abnormal
ABS_MSG
(Missing message from the
ABS (ABS/TCS) HU/CM or
DSC HU/CM)
Present
Circuit in the ABS (ABS/TCS)
HU/CM or DSC HU/CM is
normal
Instrument cluster
Not Present
Circuit in the ABS (ABS/TCS)
HU/CM or DSC HU/CM is
abnormal
PCM_MSG
(Missing message from the
PCM)
Present
Circuit in the PCM is normal
•
ABS (ABS/TCS)
HU/CM or DSC
HU/CM
•
Instrument
cluster
Not Present
Circuit in the PCM is abnormal
T–12
MULITIPLE COMMUNICATION SYSTEM
Flowchart
Example (Open circuit in PCM-related wiring harness)
.
Note
•
This example is for vehicles not equipped with a TCS or DSC.
1. DTCs for the PCM, ABS HU/CM and instrument cluster can be verified using a SST (WDS or equivalent).
A6E8111TH01
A6E8111T008
1
Instrument cluster
2
Circuit open
3
Twist pair
Module
Displayed DTC
Probable malfunction location
PCM
U0073
PCM-related CAN system malfunction
U0121
Communication error between PCM and ABS HU/CM
U0155
Communication error between PCM and instrument cluster
ABS HU/CM
U1900, U2516
ABS HU/CM-related CAN system malfunction
Instrument cluster
U1900, U2516
Instrument cluster-related CAN system malfunction
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст