Mazda CX 7. Manual — part 336
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
09-02D–1
09-02D
09-02D ON-BOARD DIAGNOSTIC
[MULTIPLEX COMMUNICATION SYSTEM]
MULTIPLEX COMMUNICATION
SYSTEM[MULTIPLEX COMMUNICATION
SYSTEM] . . . . . . . . . . . . . . . . . . . . . . . . 09-02D–2
Outline . . . . . . . . . . . . . . . . . . . . . . . . . 09-02D–2
Flowchart . . . . . . . . . . . . . . . . . . . . . . . 09-02D–2
DTC TABLE[MULTIPLEX
COMMUNICATION SYSTEM] . . . . . . . . 09-02D–7
PROCEDURES FOR DETERMINING
THE LOCATION OF A MALFUNCTION
[MULTIPLEX COMMUNICATION
SYSTEM] . . . . . . . . . . . . . . . . . . . . . . . 09-02D–8
System Wiring Diagram . . . . . . . . . . . . 09-02D–8
PCM . . . . . . . . . . . . . . . . . . . . . . . . . . . 09-02D–8
TCM . . . . . . . . . . . . . . . . . . . . . . . . . . . 09-02D–9
DSC HU/CM. . . . . . . . . . . . . . . . . . . . . 09-02D–9
AWD Control Module. . . . . . . . . . . . . . . 09-02D–10
BCM . . . . . . . . . . . . . . . . . . . . . . . . . . . 09-02D–10
SAS Control Module . . . . . . . . . . . . . . . 09-02D–11
Keyless Control Module . . . . . . . . . . . . 09-02D–11
Instrument Cluster. . . . . . . . . . . . . . . . . 09-02D–12
Climate Control Unit . . . . . . . . . . . . . . . 09-02D–13
Car- navigation Unit/Audio Unit
(Base Module). . . . . . . . . . . . . . . . . . . 09-02D–13
Information display . . . . . . . . . . . . . . . . 09-02D–13
Repair Procedure . . . . . . . . . . . . . . . . . 09-02D–14
DTC U0073[MULTIPLEX
COMMUNICATION SYSTEM] . . . . . . . . 09-02D–14
DTC U0516, U2516, 16:Er12
[MULTIPLEX COMMUNICATION
SYSTEM] . . . . . . . . . . . . . . . . . . . . . . . . 09-02D–16
End of Toc
WM: CAN SYSTEM
1871-1U-06B(09-02D).fm 1 ページ 2006年3月15日 水曜日 午前11時40分
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
09-02D–2
MULTIPLEX COMMUNICATION SYSTEM[MULTIPLEX COMMUNICATION SYSTEM]
id0902e6830400
Outline
• If the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules, using
the M-MDS to determine the malfunctioning system.
— PCM
— TCM
— DSC HU/CM
— AWD control module
— BCM
— SAS control module
— Keyless control module
— Instrument cluster
— Audio amplifier
— Climate control unit
— Audio unit (base module)
— Car-navigation unit
— Information display
Flowchart
• Use the following flowchart to verify the cause of the trouble.
STEP
INSPECTION
ACTION
1
INSPECT DTC INDICATION
• Using the M-MDS, inspect if DTCs are
displayed for the following module:
— PCM
— TCM
— DSC HU/CM
— AWD control module
— BCM
— SAS control module
— Keyless control module
— Instrument cluster
— Audio amplifier
— Climate control unit
— Audio unit (base module)
— Car-navigation unit
— Information display
• Are any DTCs displayed?
Yes
Go to the next step.
No
Go to Step 5.
2
INSPECT CAN SYSTEM-RELATED DTC
• Are any DTCs other than the following
displayed?
— U0073
— U0100
— U0101
— U0114
— U0121
— U0140
— U0151
— U0155
— U0164
— U0166
— U0181
— U0184
— U0214
— U0323
— U0415
— U0516
— U1900
— U2023
— U2516
— 16:Er12
Yes
Repair the malfunctioning part by following the related DTC
inspection.
Go to the next step.
No
Go to the next step.
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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
09-02D–3
09-02D
3
INSPECT CAN SYSTEM-RELATED DTC
• Are any of the following DTCs displayed?
— PCM: U0073, U0101, U0121, U0155
— TCM: U0073, U0100, U0121, U0140,
U415
— DSC HU/CM: U0073, U0100, U0101,
U0114, U0140, U1900, U2023
— AWD control module: U0073, U0100,
U0101, U0121, U0155
— BCM: U0073
— SAS control module: U0073, U0155
— Keyless control module: U0073, U0100,
U0140, U0323, U2023
— Instrument cluster: U0073, U0100,
U0101, U0114, U0166, U0121, U0140,
U0151, U0214, U2516
— Climate control unit: U0155, U0516
— Audio unit: 16:Er12
— Information display: U0166, U0181,
U0184, U2516
Yes
Repair the malfunctioning part by following the DTC
inspection.
Go to the next step.
No
Troubleshooting completed.
4
VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC from the CAN system-related
modules using the M-MDS.
• Start the engine.
• Are any of the CAN related DTCs displayed?
Yes
Go back to Step 3.
No
Troubleshooting completed.
5
INSPECT COMMUNICATION CONDITION
• Is there a response from the following
modules?
— PCM
— TCM
— DSC HU/CM
— AWD control module
— BCM
— SAS control module
— Keyless control module
— Instrument cluster
— Audio amplifier
— Climate control unit
— Audio unit (base module)
— Car-navigation unit
— Information display
Yes
Troubleshooting completed.
No
Go to the next step.
6
INSPECT MODULES THAT DO NOT
RESPOND
• Inspect the power supply and the ground
circuit for any units that do not respond.
• Are they normal?
Yes
Go to the next step.
No
Repair the malfunctioning part, then go back to Step 1.
STEP
INSPECTION
ACTION
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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
09-02D–4
7
INSPECT CONNECTOR AND WIRING
HARNESS BETWEEN MODULES THAT DO
NOT RESPOND AND DLC-2
• Turn the ignition switch to the LOCK position.
• Inspect the wiring harness and connector
between any module that does not respond
and the DLC-2.
PCM— DLC-2
• 1AM— F
• 1AI— E
TCM— DLC-2
• A14— F
• A6— E
DSC HU/CM— DLC-2
• X— F
• W— E
AWD control module— DLC-2
• G— F
• H— E
BCM— DLC-2
• 3X, 5L— F
• 3W, 5I— E
SAS control module— DLC-2
• 2E— F
• 2F— E
Keyless control module— DLC-2
• 3X— F
• 3W— E
Instrument cluster— DLC-2
• 2R— F
• 2T— E
• 2V— L
• 2X— K
Audio amplifier— DLC-2
• 2O— L
• 2P— K
Climate control unit— DLC-2
• B— L
• A— K
Audio unit— DLC-2
• 1O— L
• 1Q— K
Car-navigation unit— DLC-2
• 1O— L
• 1Q— K
Information display— DLC-2
• J— L
• I— K
• Is there any malfunction?
Yes
Repair the malfunctioning part, then go back to Step 1.
No
Go to the next step.
8
INSPECT WIRING HARNESS
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between the following
terminals.
— DLC-2 terminals F and GND
— DLC-2 terminals E and GND
— DLC-2 terminals L and GND
— DLC-2 terminals K and GND
• Is the voltage 2.0— 3.0 V?
Yes
Go to the next step.
No
Go to Step 13.
9
INSPECT WIRING HARNESS
• Turn the ignition switch to the LOCK position.
• Measure the resistance between the
following terminals.
— DLC-2 terminals F and E
— DLC-2 terminals L and K
• Is the resistance 59— 65 ohms?
Yes
Replace the modules that do not respond, then go back to
Step 1.
No
Go to the next step.
STEP
INSPECTION
ACTION
1871-1U-06B(09-02D).fm 4 ページ 2006年3月15日 水曜日 午前11時40分
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