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

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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

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.

Go to Step 5.

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.

Go to the next step.

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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]

09-02D–3

09-02D

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.

Troubleshooting completed.

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.

Troubleshooting completed.

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.

Go to the next step.

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.

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

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.

Go to the next step.

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.

Go to Step 13.

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.

Go to the next step.

STEP

INSPECTION

ACTION

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