Mazda CX 7. Manual - part 173

SYMPTOM TROUBLESHOOTING 

03-03–1

03-03

03-03

SYMPTOM TROUBLESHOOTING

ELECTRONIC AWD CONTROL 

SYSTEM WIRING DIAGRAM  . . . . . . . .  03-03–1

FOREWORD . . . . . . . . . . . . . . . . . . . . . .  03-03–2
SYMPTOM TROUBLESHOOTING . . . . .  03-03–2

NO.1 FREQUENT FRONT WHEEL 

SLIP  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 03-03–3

NO.2 TIGHT CORNER BRAKING  . . . . . . 03-03–4
NO.3 ABNORMAL NOISE AND/OR 

VIBRATION FROM COUPLING 
COMPONENT . . . . . . . . . . . . . . . . . . . . . 03-03–5

End of Toc

WM: DIFFERENTIAL (FF/FR)

ELECTRONIC AWD CONTROL SYSTEM WIRING DIAGRAM

id030300800100

End Of Sie

N

BATTERY

IGNITION SWITCH

DIFFERENTIAL OIL 
TEMPERATURE 
SENSOR

AWD CM

ELECTRONIC CONTROL 
COUPLING

AWD SOLENOID

OTHER SYSTEMS
(TCM, DSC HU/CM, 
INSTRUMENT 
CLUSTER ETC.)

PCM

CAN_H

CAN_L

CAN DRIVER

K

I

A

C

H

G

P

O

acxuuw00002222

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SYMPTOM TROUBLESHOOTING 

03-03–2

FOREWORD

id030300800200

End Of Sie

SYMPTOM TROUBLESHOOTING

id030300800300

• Verify the symptoms, and perform troubleshooting according to the appropriate number.

End Of Sie

Malfunction vehicle delivered

Questionnaire

Verify malfunction symptoms

Symptom troubleshooting

Verify that malfunctions have been repaired

Troubleshooting completed

Confirm all customer problems using a questionnaire.

Confirm malfunction on actual vehicle.

DTC inspection

Inspect for DTCs using M-MDS.

Perform applicable troubleshooting inspection according to
diagnostic index.

acxuuw00001066

No.

Symptom

Description

1

Frequent front wheel slip

Front wheels slip frequently during acceleration on low-friction road.

2

Tight corner braking effect

Brakes seem to be applied during tight cornering while driving very 
slowly on paved road.

3

Abnormal noise and/or vibration from 
coupling unit

There is abnormal noise and/or vibration from coupling unit during 
driving.

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SYMPTOM TROUBLESHOOTING 

03-03–3

03-03

NO.1 FREQUENT FRONT WHEEL SLIP

id030300800400

Warning

• During simulation driving, vehicle stability may decrease extremely and cause an accident. Be 

sure to perform the simulation test driving in a safe area.

Diagnostic procedure

End Of Sie

1

Frequent front wheel slip

[TROUBLESHOOTING HINTS]

• Tire traction performance is extremely poor for given road friction. (AWD system is normal.)

• Improper wheel alignment (AWD system is normal.)

• Rear differential oil temperature is extremely high (Fail-safe condition)

• Differential oil temperature sensor malfunction (Fail-safe condition)

• Compare slip frequency with another vehicle of the same model (under the same road conditions and tire traction 

performance).

• Replace tires with others of the same model and perform test under the same road conditions to determine if the 

malfunction was caused by tire traction performance.

• Coupling component malfunction

• AWD solenoid malfunction

STEP

INSPECTION

ACTION

1

VERIFY DSC, PCM, AND AWD SYSTEM DTCs

• Verify DSC, PCM, and AWD system DTCs 

using the M-MDS.

• Are there any DTCs present?

Yes

Go to applicable DTC inspection.

No

Go to next step.

2

VERIFY TIRE AIR PRESSURE

• Inspect tire air pressure.

• Is it within specification?

Yes

Go to next step.

No

Adjust tire air pressure, then go to next step.

3

COMPARE WITH SAME MODEL TIRES

• Install tires of the same model.

• Perform simulation driving.

• Does malfunction recur?

Yes

Go to next step.

No

AWD system is okay.

4

COMPARE WITH SAME MODEL VEHICLE

• Install tires of malfunctioning vehicle to 

another same model vehicle.

• Perform simulation driving.

• Does malfunction recur?

Yes

AWD system is okay.

No

Go to next step.

5

INSPECT AWD SOLENOID

• Inspect AWD solenoid.

(See 03-19-11 AWD SOLENOID 
INSPECTION)

• Is coupling component solenoid okay?

Yes

Inspect harness between AWD solenoid and AWD CM, then 
go to next step.

No

Replace coupling component. (See 03-19-4 COUPLING 
COMPONENT REMOVAL/INSTALLATION.)

6

INSPECT WHEEL ALIGNMENT

• Inspect wheel alignment.

• Is it okay?

Yes

Replace coupling component. (See 03-19-4 COUPLING 
COMPONENT REMOVAL/INSTALLATION.)

No

Inspect wheel alignment, and adjust it if necessary.

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SYMPTOM TROUBLESHOOTING 

03-03–4

NO.2 TIGHT CORNER BRAKING

id030300800500

Diagnostic procedure

End Of Sie

2

Tight corner braking

[TROUBLESHOOTING HINTS]

• Because the coupling component locks up easily (similar to direct AWD), rotational difference between the front 

and rear wheels cannot be absorbed and brake-like phenomenon occurs.

• Due to the coupling component construction, slight tight corner braking effect occurs during tight cornering on a 

paved road. (AWD system is okay. Compare with another same model vehicle to determine malfunction.)

• Coupling component malfunction

• AWD solenoid malfunction

STEP

INSPECTION

ACTION

1

VERIFY DSC, PCM, AND AWD SYSTEM DTCS

• Verify DSC, PCM, and AWD system DTCs 

using the M-MDS.

• Are there any DTCs present?

Yes

Go to applicable DTC inspection.

No

Go to next step.

2

VERIFY TIRE AIR PRESSURE

• Inspect tire air pressure.

• Is it within specification?

Yes

Go to next step.

No

Adjust tire air pressure, then go to next step.

3

INSPECT ABS WHEEL-SPEED SENSOR

• Inspect ABS wheel-speed sensor.

• Is it okay?

Yes

Go to next step.

No

Repair or replace malfunctioning part.

4

COMPARE WITH SAME MODEL VEHICLE

• Perform simulation driving with another same 

model vehicle.

• Does malfunction recur on the same model 

vehicle?

Yes

AWD system is okay.

No

Go to next step.

5

PERFORM SIMULATION DRIVING WITH AWD 
SOLENOID CONNECTOR DISCONNECTED

• Turn ignition key OFF.

• Disconnect AWD solenoid connector.

• Perform simulation driving. (Clear DTC after 

simulation driving.)

• Does malfunction recur?

Yes

Replace coupling component. (See 03-19-4 COUPLING 
COMPONENT REMOVAL/INSTALLATION.)

No

Go to next step.

6

INSPECT AWD SOLENOID

• Inspect AWD solenoid.

(See 03-19-11 AWD SOLENOID 
INSPECTION)

• Is it okay?

Yes

Inspect harness between AWD solenoid and AWD CM, then 
go to next step.

No

Replace coupling component. (See 03-19-4 COUPLING 
COMPONENT REMOVAL/INSTALLATION.)

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