Mazda CX-9 Grand Touring 2009 Manual page 500

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9
Parking brake is not fully
ABS
released while driving.
warning
Brake drag.
light
BRAKE
Sudden
system
acceleration/deceleration.
warning
light
Left/right or front/rear tires are
different. (Size, radius, tire
DSC
pressure, or wear is other than
indicator
that listed on tire label.)
light
TCS OFF
light
Battery voltage at DSC/RSC
HU/CM ignition terminal drops
below approx. 10 V.
Brake
system
Brake fluid amount is low.
warning
light
2. Precautions during servicing of DSC/RSC
The DSC/RSC is composed of electrical and mechanical parts. It is necessary to categorize malfunctions
as being either electrical or hydraulic when performing troubleshooting.
1. Malfunction in electrical system
The control module has an on-board diagnostic function. With this function, the ABS
warning light and/or BRAKE system warning light and/or DSC indicator light and/or TCS
OFF light will illuminate when there is a problem in the electrical system.
Also, past and present malfunctions are in the control module. This function can find
malfunctions that do not occur during periodic inspections. Connect the M-MDS to the DLC-
2, the stored malfunctions will be displayed in the order of occurrence. To find out the causes
of DSC/RSC malfunctions, use these on-board diagnostic results.
If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor
connection of the wiring harness.
The control module usually operates normally. Be careful when searching for the cause of
malfunction.
2008 Mazda CX-9 Grand Touring
wheel speed sensors are
spun for 20 s or more.
After turning
ignition switch off,
vehicle is driven at
speed greater than
10 km/h {6.2 mph}
and normal
operation is
confirmed.
ABS: Disables control.
Battery voltage rises EBD: Enables control.
above approx. 10 TCS: Disables control.
V. DSC: Disables control.
RSC: Disables control.
ABS: Enables control.
Brake fluid level
EBD: Enables control.
lower than
TCS: Enables control.
recommended
DSC: Disables control.
amount.
RSC: Disables control.
DSC/RSC HU/CM
detects that wheel speed
sensors determine that
two or more wheels are
malfunctioning.
2. Enables control, if wheel
speed sensors determine
three or more wheels are
functioning correctly.
TCS: Disables control.
DSC: Disables control.
RSC: Disables control.