CAN SYSTEM DESCRIPTION
id094000101000
Mechanism of CAN System-Related Module
|
Component |
Function |
|
|---|---|---|
|
Electrical circuit
|
Supplies power to CPU and vicinity, and to input/output interface.
|
|
|
CPU
|
Computation processing block
|
Control function has been expanded, and when transmission is necessary, transmitted data is stored in a multiplex block. If a multiplex block receives a request to read stored data, transmitted data is read from the multiplex block.
|
|
Multiplex block
|
Transmits data received from bus line to computation processing block. In addition, sends transmitted data stored from computation processing block to bus line.
|
|
|
Input/Output interface
|
Electrically converts information signals from switches to, be input to CPU, and signals output from CPU for operating actuator or indicator lights.
|
|
acxuun00000506
|
Twisted Pair
acxaan00000062
|
Time Division Multiplex
acxuun00000508
|
Vehicle CAN System
acxuun00000509
|
CAN Signal-Chart (HS-CAN)
|
Signal |
Multiplex module |
|||||||
|---|---|---|---|---|---|---|---|---|
|
PCM |
TCM (ATX only) |
DSC HU/CM |
4WD control module |
SAS control module |
BCM |
Keyless control module (with advanced keyless) |
Instrument cluster |
|
|
Immobilizer-related information
|
OUT
|
–
|
–
|
–
|
–
|
–
|
IN
|
IN
|
|
IN
|
–
|
OUT
|
||||||
|
IN
|
OUT
|
–
|
||||||
|
Engine torque
|
OUT
|
–
|
IN
|
–
|
–
|
–
|
–
|
–
|
|
Engine specification
|
OUT
|
–
|
IN
|
–
|
–
|
–
|
–
|
–
|
|
Brake pedal position
|
OUT
|
IN
|
–
|
–
|
–
|
–
|
–
|
–
|
|
Engine speed
|
OUT
|
IN
|
IN
|
IN
|
–
|
–
|
–
|
IN
|
|
Vehicle speed
|
OUT
|
–
|
–
|
–
|
IN
|
–
|
–
|
IN
|
|
IN
|
OUT
|
–
|
–
|
|||||
|
Throttle position
|
OUT
|
IN
|
IN
|
IN
|
–
|
–
|
–
|
–
|
|
Torque down request
|
IN
|
–
|
OUT
|
–
|
–
|
–
|
–
|
–
|
|
Tire circumference (front/rear)
|
OUT
|
IN
|
IN
|
–
|
–
|
–
|
–
|
–
|
|
IN
|
–
|
OUT
|
||||||
|
Engine coolant temperature
|
OUT
|
IN
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
Intake air temperature
|
OUT
|
IN
|
–
|
–
|
–
|
–
|
–
|
–
|
|
MIL on request
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
IN
|
OUT
|
–
|
||||||
|
Travelled distance
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
IN
|
OUT
|
–
|
||||||
|
Fuel injection amount
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
Generator warning light on request
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
Cruise main/set indicator light on request
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
Cruise control system-related information
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
IN
|
|
Target engine torque
|
IN
|
OUT
|
OUT
|
–
|
–
|
–
|
–
|
–
|
|
Target engine speed
|
IN
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
|
MTX gear position
|
OUT
|
–
|
IN
|
IN
|
–
|
–
|
–
|
IN
|
|
Shift lever position
|
OUT
|
–
|
–
|
IN
|
–
|
–
|
–
|
IN
|
|
ATX gear position
|
IN
|
OUT
|
IN
|
IN
|
–
|
–
|
–
|
IN
|
|
Selector lever position
|
IN
|
OUT
|
–
|
IN
|
–
|
–
|
–
|
IN
|
|
ATF temperature
|
IN
|
OUT
|
–
|
–
|
–
|
–
|
–
|
–
|
|
Brake system status (EBD/ABS/DSC)
|
IN
|
–
|
OUT
|
–
|
–
|
–
|
–
|
–
|
|
Brake system warning light on request
|
–
|
–
|
OUT
|
–
|
–
|
–
|
–
|
IN
|
|
ABS warning light on request
|
–
|
–
|
OUT
|
–
|
–
|
–
|
–
|
IN
|
|
DSC/TCS indicator light on request
|
–
|
–
|
OUT
|
–
|
–
|
–
|
–
|
IN
|
|
TCS OFF light on request
|
–
|
–
|
OUT
|
–
|
–
|
–
|
–
|
IN
|
|
Wheel speed (LF, RF, LR, RR)
|
IN
|
IN
|
OUT
|
IN
|
–
|
IN
|
–
|
–
|
|
4WD system status
|
–
|
–
|
IN
|
OUT
|
–
|
–
|
–
|
IN
|
|
Air bag system warning light on request
|
–
|
–
|
–
|
–
|
OUT
|
–
|
–
|
IN
|
|
Buckle switch status (driver-side, passenger-side)
|
–
|
–
|
–
|
–
|
OUT
|
–
|
–
|
IN
|
|
Passenger sensing system status
|
–
|
–
|
–
|
–
|
OUT
|
–
|
–
|
IN
|
|
Steering angle/steering angle sensor status
|
–
|
–
|
IN
|
–
|
–
|
OUT
|
–
|
–
|
|
Door switch status (LF, RF, LR, RR, liftgate)
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
Door lock-link switch status (driver-side)
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
Keyless indicator ligth on request
|
–
|
–
|
–
|
–
|
–
|
–
|
OUT
|
IN
|
|
Keyless warning ligth on request
|
–
|
–
|
–
|
–
|
–
|
–
|
OUT
|
IN
|
|
Keyless warning buzzer on request
|
–
|
–
|
–
|
–
|
–
|
–
|
OUT
|
IN
|
|
Key reminder switch status
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
A/C on request
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
IN
|
–
|
OUT
|
||||||
|
Turn indicator light on request
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
Parking brake switch status
|
–
|
–
|
IN
|
–
|
–
|
OUT
|
–
|
IN
|
|
–
|
IN
|
–
|
OUT
|
|||||
|
Brake fluid level
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
IN
|
–
|
OUT
|
||||||
|
Oil pressure switch status
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
Door lock switch status
|
–
|
–
|
–
|
–
|
–
|
OUT
|
–
|
IN
|
|
Fuel tank level
|
IN
|
–
|
–
|
–
|
–
|
–
|
–
|
OUT
|
|
Security light on request
|
–
|
–
|
–
|
–
|
–
|
–
|
OUT
|
IN
|
|
Air bag system warning light status
|
–
|
–
|
–
|
–
|
IN
|
–
|
–
|
OUT
|
CAN Signal-Chart (MS-CAN)
|
Signal |
Multiplex module |
||||
|---|---|---|---|---|---|
|
Information display |
Climate control unit (with full-auto air conditioner) |
Audio unit (base module) |
Audio amplifier (with Bose®) |
Instrument cluster |
|
|
Beep sound request
|
OUT
|
–
|
IN
|
IN
|
–
|
|
INFO switch status
|
OUT
|
IN
|
–
|
–
|
IN
|
|
A/C on request
|
–
|
OUT
|
–
|
–
|
IN
|
|
A/C status display request
|
IN
|
OUT
|
–
|
–
|
–
|
|
Audio status display request
|
IN
|
–
|
OUT
|
–
|
–
|
|
Audio system-related information
|
–
|
–
|
OUT
|
IN
|
–
|
|
IN
|
OUT
|
||||
|
Engine speed
|
–
|
–
|
IN
|
–
|
OUT
|
|
Vehicle speed
|
IN
|
IN
|
IN
|
–
|
OUT
|
|
Ignition key position
|
IN
|
IN
|
IN
|
–
|
OUT
|
|
Seat belt warning light status
|
IN
|
–
|
–
|
–
|
OUT
|
|
Dimmer switch status
|
IN
|
–
|
IN
|
–
|
OUT
|
|
Drive information system data
|
IN
|
–
|
–
|
–
|
OUT
|
|
Engine coolant temperature
|
IN
|
IN
|
–
|
–
|
OUT
|
On-Board Diagnostic Function
Block diagram
acxaan00000245
|
Failure detection function
Fail-safe function
Memory function
Self-malfunction diagnostic function
DTC table
|
DTC |
Malfunction location |
DTC output module |
|---|---|---|
|
U0028
|
CAN system communication error
|
BCM
|
|
U0073
|
CAN system communication error
|
• PCM
• TCM (ATX only)
• DSC HU/CM
• 4WD control module
• BCM
• SAS control module
• Keyless control module (with advanced kyeless)
• Instrument cluster
|
|
U0100
|
Communication error to PCM
|
• TCM (ATX only)
• DSC HU/CM
• 4WD control module
• BCM
• Keyless control module (with advanced kyeless)
• Instrument cluster
|
|
U0101
|
Communication error to TCM (ATX only)
|
• PCM
• DSC HU/CM
• 4WD control module
• Instrument cluster
|
|
U0114
|
Communication error to 4WD control module
|
• DSC HU/CM
• Instrument cluster
|
|
U0121
|
Communication error to DSC HU/CM
|
• PCM
• TCM (ATX only)
• 4WD control module
• Instrument cluster
|
|
U0140
|
Communication error to BCM
|
• DSC HU/CM
• 4WD control module (MTX only)
• Keyless control module (with advanced kyeless)
• Instrument cluster
|
|
Communication error to instrument cluster
|
TCM (ATX only)
|
|
|
U0151
|
Communication error to SAS control module
|
• SAS control module
• Instrument cluster
|
|
U0155
|
Communication error to instrument cluster
|
• PCM
• 4WD control module
• SAS control module
• Climate control unit (with full-auto air conditioner)
|
|
U0164
|
Communication error to climate control unit (with full-auto air conditioner)
|
Instrument cluster
|
|
U0166
|
Communication error to climate control unit (with full-auto air conditioner)
|
Information display
|
|
U0181
|
Communication error to instrument cluster
|
Information display
|
|
U0184
|
Communication error to audio unit (base module)
|
Information display
|
|
U0323
|
Communication error to instrument cluster
|
Keyless control module (with advanced kyeless)
|
|
U0415
|
Abnormal message from DSC HU/CM
|
TCM (ATX only)
|
|
U0516
|
CAN system communication error
|
Climate control unit (with full-auto air conditioner)
|
|
U1900
|
Communication error to other module
|
DSC HU/CM
|
|
U2023
|
Abnormal message from PCM
|
• DSC HU/CM
• Keyless control module (with advanced kyeless)
• Instrument cluster
|
|
U2516
|
CAN system communication error
|
• Instrument cluster
• Information display
|
|
16:Er12
|
CAN system communication error
|
Audio unit (base module)
|
Narrowing down malfunction locations
Flowchart
acxaan00000057
|
Example (PCM-related communication error)
1. DTCs for the PCM, DSC HU/CM and instrument cluster can be verified using the Mazda Modular Diagnostic System (M-MDS).
|
Module |
Displayed DTC |
Probable malfunction location |
|---|---|---|
|
PCM
|
U0073
|
PCM-related CAN system malfunction
|
|
U0121
|
Communication error between PCM and DSC HU/CM
|
|
|
U0155
|
Communication error between PCM and instrument cluster
|
|
|
DSC HU/CM
|
U0100
|
Communication error between DSC HU/CM and PCM
|
|
Instrument cluster
|
U0100
|
Communication error between instrument cluster and PCM
|
acxuun00000521
|
2. If there is a communication error between the instrument cluster and PCM, even if the communication between the DSC HU/CM and the instrument cluster is normal, it is probable that there is a malfunction in the PCM or PCM-related wiring harnesses.