Mazda Mazda6 Workshop Manual Supplement page 851

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
Flowchart
• Use the following flowchart to verify the cause of the trouble.
Using the SST (WDS or equivalent), verify if DTCs are displayed for PCM, TCM, ABS (ABS/TCS) HU/CM (with ABS (ABS/TCS)),
DSC HU/CM (with DSC), 4WD control module and instrument cluster.
Are any DTCs displayed?
Are any DTCs other than the following displayed?
PCM: U0073, U0101, U0121, U0155
TCM: U0073, U0100
ABS (ABS/TCS) HU/CM, DSC HU/CM,
Instrument cluster: U1900, U2516
4WD control module: U0100, U0101, U0121
No
Repair the malfunctioning part by
following the DTC inspection.
Are any of the following DTCs displayed?
PCM: U0073, U0101, U0121, U0155
TCM: U0073, U0100
ABS (ABS/TCS) HU/CM, DSC HU/CM,
Instrument cluster: U1900, U2516
4WD control module: U0100, U0101, U0121
Yes
Narrow down CAN system malfunction location.
Repair the malfunctioning part by following the DTC inspection.
Using the SST (WDS or equivalent), verify if DTCs are displayed
for PCM, TCM, ABS (ABS/TCS) HU/CM, DSC HU/CM, 4WD
control module and instrument cluster.
Are any DTCs displayed?
No
Using the SST (WDS or equivalent), clear DTCs stored in
each module.
END
End Of Sie
T–40
Yes
Yes
Yes
START
Is there a response from the PCM, TCM, ABS (ABS/TCS) HU/CM,
DSC HU/CM, 4WD control module and/or instrument cluster?
No
Inspect the power supply and the ground circuits for any units
that do not respond.
Are they normal?
Yes
Turn the ignition switch to the LOCK position.
Inspect the wiring harness and connector between
No
any unit that does not respond and the DLC-2.
PCM DLC-2 (except MZR-CD (RF Turbo))
—
2R CAN_L
—
2U CAN_H
—
PCM DLC-2 (MZR-CD (RF Turbo))
—
39 CAN_L
—
13 CAN_H
—
TCM DLC-2
—
2J CAN_L
—
2M CAN_H
—
ABS (ABS/TCS) HU/CM
X KLN
—
DSC HU/CM
AB KLN
—
4WD control module
H CAN_L
—
G CAN_H
—
Instrument cluster
2W CAN_L
—
2X CAN_H
—
Are the wiring harnesses and connectors normal?
Yes
B
A
No
Yes
END
No
Repair the malfunctioning part.
DLC-2
—
DLC-2
—
DLC-2
—
DLC-2
—
No
Repair the malfunctioning part.
A
A
A6E8162L101