Mazda 6 2002, Workshop Manual

Page: 1039 / 1248

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–140–1
T
T–140 BODY ELECTRICAL SYSTEM
MULTIPLEX COMMUNICATION SYSTEM
A6E816255430W01
Outline
•
In case the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules,
using the
SST (WDS or equivalent) to determine the malfunctioning system.
— PCM
— DSC HU/CM (with DSC)
— ABS (ABS/TCS) HU/CM (with ABS (ABS/TCS)
— Instrument cluster
Flowchart
•
Use the following flowchart to verify the cause of the trouble.
End Of Sie
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
Repair the malfunctioning part by
following the DTC inspection.
A
Inspect the power supply and the ground circuits for any units
that do not respond.
Are they normal?
Repair the malfunctioning part. A
A
B
START
Using the SST (WDS or equivalent), verify if DTCs are displayed for PCM, ABS (ABS/TCS) HU/CM (with ABS (ABS/TCS)),
DSC HU/CM (with DSC) and instrument cluster.
Are any DTCs displayed?
Yes
Are any DTCs other than the following displayed?
PCM: U0073, U0121, U0155
ABS (ABS/TCS) HU/CM, DSC HU/CM,
Instrument cluster: U1900, U2516
No
END
No
No
Yes
Are any of the following DTCs displayed?
PCM: U0073, U0121, U0155
ABS (ABS/TCS) HU/CM, DSC HU/CM,
Instrument cluster: U1900, U2516
Yes
Yes
Narrow down CAN system malfunction location.
Using the SST (WDS or equivalent), verify if DTCs
are displayed for PCM, ABS (ABS/TCS) HU/CM,
DSC HU/CM and instrument cluster.
Are any DTCs displayed?
No
Using the SST (WDS or equivalent), clear DTCs
stored in each module.
END
Yes
No
Turn the ignition switch to the LOCK position.
Inspect the wiring harness and connector between any unit that
does not respond and the DLC-2.
PCM
—
DLC-2
2R
—
CAN_L
2U
—
CAN_H
ABS (ABS/TCS) HU/CM
—
DLC-2
X
—KLN
DSC HU/CM
—
DLC-2
AB
—
KLN
Instrument cluster
—
DLC-2
2W
—
CAN_L
2X
—
CAN_H
Are the wiring harnesses and connectors normal?
Is there a response from the PCM, ABS (ABS/TCS) HU/CM,
DSC HU/CM and/or instrument cluster?
No
Yes
No
Yes
Repair the malfunctioning part by following the
DTC inspection.
Repair the malfunctioning part.
A6E8162L001