Mazda 6. Manual — part 346
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–140–1
T
T–140BODY 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.
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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
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–141
T
TBODY ELECTRICAL SYSTEM
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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
Connect each unit connector.
Turn the ignition switch to the ON position.
Measure the voltage between DLC-2 terminals CAN_L and CAN_H.
Is the voltage 2.0—3.0 V?
Turn the ignition switch to the LOCK position.
Measure the resistance between DLC-2 terminals CAN_L and
CAN_H.
Is the resistance 59—65 ohms?
Replace any units that
do not respond.
Disconnect the PCM connector.
Measure the resistance between PCM
connector terminals 2R and 2U.
Is the resistance 118—130 ohms?
Replace the PCM.
Disconnect the instrument cluster connector.
Measure the resistance between instrument cluster connector
terminals 2W and 2X.
Is the resistance 118—130 ohms?
Replace the instrument
cluster.
Turn the ignition switch to the LOCK position.
Disconnect the connector of any unit that does not respond.
(If there are two or more units that do not respond,
disconnect only one of the units.)
Turn the ignition switch to the ON position.
Measure the voltage between DLC-2 terminals CAN_L and
CAN_H.
Is the voltage 2.0—3.0 V?
The disconnected unit or the
related wiring harness may
have a malfunction.
Replace the disconnected unit.
Replace the related wiring harness.
The disconnected
unit is normal.
Are all units that do not respond disconnected?
Inspect if the related wiring harnesses (CAN_L
and/or CAN_H) have been shorted (to power
supply or ground).
If a short is found, replace the related wiring
harness.
Yes
No
B
A
A
A
A
A
A
Turn the ignition switch to the LOCK position.
Verify the continuity between the following connector terminals of any disconnected unit.
PCM connector: 2R (CAN_L)—other terminals, 2U (CAN_H)—other terminals
ABS (ABS/TCS) HU/CM connector: R (CAN_L)—other terminals,
O (CAN_H)—other terminals
DSC HU/CM connector: AF (CAN_L)—other terminals, AG (CAN_H)—other terminals
Instrument cluster connector: 2W (CAN_L)—other terminals, 2X (CAN_H)—other terminals
Is there continuity?
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
A6E8162L002
T–142
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
DTC TABLE
A6E816255430W02
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PID/DATA MONITOR TABLE
A6E816255430W03
End Of Sie
PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION
A6E816255430W04
System Wiring Diadram
DTC
Malfunction location
Related module
Page
U0073
CAN system communication error
PCM
(See
U0121
Communication error to ABS (ABS/TCS) HU/CM
or DSC HU/CM
—
U0155
Communication error to instrument cluster
U1900
CAN system communication error
• ABS (ABS/TCS) HU/CM (with
ABS (ABS/TCS)
• DSC HU/CM (with DSC)
• Instrument cluster
(See
U2516
CAN system wiring harness open and short
circuit
PID name (definition)
Condition
Specification
Related module
Terminal
IC_MSG
(Missing message from the
instrument cluster)
Present
Circuit in the instrument cluster
is normal.
ABS (ABS/TCS)
HU/CM or DSC HU/
CM
• ABS (ABS/TCS)
HU/CM: O, R
• DSC HU/CM: AF,
AG
• Instrument cluster:
2W, 2X
Not Present
Circuit in the instrument cluster
is abnormal.
ABS_MSG
(Missing message from the
ABS (ABS/TCS) HU/CM or
DSC HU/CM)
Present
Circuit in the ABS (ABS/TCS)
HU/CM or DSC HU/CM is
normal.
Instrument cluster
Not Present
Circuit in the ABS (ABS/TCS)
HU/CM or DSC HU/CM is
abnormal.
PCM_MSG
(Missing message from the
PCM)
Present
Circuit in the PCM is normal.
• ABS (ABS/TCS)
HU/CM or DSC
HU/CM
• Instrument
cluster
Not Present
Circuit in the PCM is abnormal.
A6E8162W002
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–143
T
PCM
1. Check the display of DTC U0121 and/or U0155, using the SST (WDS or equivalent). (See
2. Referring to the following table, determine the malfunctioning part of the CAN system.
X: Normal
—: Communication error
ABS/TCS HU/CM or DSC HU/CM
1. Accec and monitor the “PCM MSG” and “IC MSG”of PID using the SST (WDS or equivalent).
2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See
.)
3. Referring to the following table, determine the malfunctioning part of the CAN system.
X: Normal
—: Communication error
Instrument Cluster
1. Accec and monitor the “PCM MSG” and “ABS MSG” of PID using the SST (WDS or equivalent).
2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See
.)
3. Referring to the following table, determine the malfunctioning part of the CAN system.
X: Normal
—: Communication error
End Of Sie
Module
Communication status
Malfunction location
• ABS (ABS/TCS) HU/CM
• DSC HU/CM
Instrument cluster
PCM
—
—
• Wiring harness A
• PCM
—
X
• Wiring harness B
• ABS (ABS/TCS) HU/CM
• DSC HU/CM
X
—
• Wiring harness C
• Instrument cluster
Module
Communication status
Malfunction location
PCM
Instrument cluster
• ABS (ABS/TCS)
HU/CM
• DSC HU/CM
—
—
• Wiring harness B
• ABS (ABS/TCS) HU/CM
• DSC HU/CM
—
X
• Wiring harness A
• PCM
X
—
• Wiring harness C
• Instrument cluster
Module
Communication status
Malfunction location
PCM
• ABS (ABS/TCS) HU/CM
• DSC HU/CM
Instrument cluster
—
—
• Wiring harness C
• Instrument cluster
—
X
• Wiring harness A
• PCM
X
—
• Wiring harness B
• ABS (ABS/TCS) HU/CM
• DSC HU/CM
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