Mazda 2002 6 - On-Board Diagnostic [Multiplex Communication System; Multiplex Communication System

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?
Ye s
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
Ye s
Are any of the following DTCs displayed?
PCM: U0073, U0121, U0155
ABS (ABS/TCS) HU/CM, DSC HU/CM,
Instrument cluster: U1900, U2516
Ye s
Ye s
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
Ye s
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
Ye s
No
Ye s
Repair the malfunctioning part by following the
DTC inspection.
Repair the malfunctioning part.
A6E8162L001