Mazda 6 Training Manual page 227

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
DTC
U0073 CAN system communication error
U0121 Communication error to ABS (ABS/TCS) HU/CM or DSC HU/CM
U0155 Communication error to instrument cluster
U1900 CAN system communication error
U2516 CAN system wiring harness open and short circuit
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.
PID name (definition)
IC_MSG
(Missing message from the
instrument cluster)
ABS_MSG
(Missing message from the
ABS (ABS/TCS) HU/CM or
DSC HU/CM)
PCM_MSG
(Missing message from the
PCM)
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
MULITIPLE COMMUNICATION SYSTEM
Malfunction location
Condition Specification
Circuit in the Instrument cluster
Present
is normal
Circuit in the Instrument cluster
Not Present
is abnormal
Circuit in the ABS (ABS/TCS)
Present HU/CM or DSC HU/CM is
normal
Circuit in the ABS (ABS/TCS)
Not Present HU/CM or DSC HU/CM is
abnormal
Present Circuit in the PCM is normal
Not Present Circuit in the PCM is abnormal
Function.) (See
PCM
• ABS (ABS/TCS) HU/CM
(vehicles with ABS (ABS/TCS))
• DSC HU/CM (vehicles with DSC)
• Instrument cluster
Related module
ABS (ABS/TCS)
HU/CM or DSC HU/
CM
Instrument cluster
• ABS (ABS/TCS)
HU/CM or DSC
HU/CM
• Instrument
cluster
T–11 PID/Data Monitoring
Related module
Terminal
• ABS (ABS/TCS)
HU/CM: O, R
• DSC HU/CM: AF,
AG
• Instrument cluster:
2W, 2X
Function.)
T–11
T T