Mazda CX-7 2007 Workshop Manual page 693

NO.3 ABNORMAL NOISE AND/OR VIBRATION FROM COUPLING COMPONENT
3 Abnormal noise and/or vibration from coupling component
[TROUBLESHOOTING HINTS]
• Abnormal noise and/or vibration from coupling component during driving
• Propeller shaft is malfunctioning or attached improperly.
• Engine mount or differential mount malfunction
• Resonance of rotating parts on vehicle (engine, propeller shaft, rear differential, tire, etc.)
• Resonance with engine vibration (mainly with exhaust system parts)
• Rear differential malfunction
• Coupling component malfunction
Diagnostic procedure
STEP
1 VERIFY DSC, PCM, AND AWD SYSTEM DTCS
• Verify DSC, PCM, and AWD system DTCs
using the M-MDS.
• Are there any DTCs present?
2 VERIFY INSTALLATION CONDITION OF
VEHICLE PARTS
• Verify installation condition for following:
— Propeller shaft (including bending and
joint operation)
— Center bearing
— Engine mount
— Differential mount
— Hub bearing
— Exhaust system parts
— ABS wheel-speed sensor
• Are they properly installed?
3 DETERMINE IF MALFUNCTION IS CAUSED
BY REAR DIFFERENTIAL
• Install tires of another brand.
Note
• When tires of another brand are
installed, the same malfunction can
occur due to conditions different from
customer explanation. Be careful not
to confuse it with customer complaint.
• Perform simulation driving at the same
engine speed, gear position, and vehicle
speed that customer vehicle had
malfunction.
• Does the same malfunction occur?
4 INSPECT REAR DIFFERENTIAL
• Inspect rear differential for following:
— Backlash
— Teeth contact
(See 03-14-10 REAR DIFFERENTIAL
ASSEMBLY)
• Are they okay?
End Of Sie
SYMPTOM TROUBLESHOOTING
INSPECTION
Yes Go to applicable DTC inspection.
No Go to next step.
Yes Go to next step.
No Repair or replace malfunctioning part.
Yes Reinstall customer's vehicle tire. Go to next step.
No AWD system is okay.
Reinstall customer's vehicle tire.
Yes Replace coupling component.
No Inspect malfunctioning part and adjust it if necessary.
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ACTION
03-03–5
03-03