Mazda CX-7 2007 Workshop Manual page 815

FOREWORD
• Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To
check the DTC, follow the DTC Inspection steps. (See 04-02-3 ON-BOARD DIAGNOSIS.)
End Of Sie
PRECAUTION
1. The ABS warning light and/or BRAKE system warning light and/or DSC indicator light and/or TCS OFF light
illuminate even when the system is normal.
Warning lights that may
illuminate and/or flash
• ABS warning light
• BRAKE system warning
light
• DSC indicator light
• Brake system warning
light
2. Precautions during servicing of DSC
The DSC 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 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.
• After repair, it is necessary to clear the DTC from the control module memory.
Also, if the DSC related parts have been replaced, verify that no DTC is displayed after repairs.
• After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the control module,
the ABS warning light may not go out even when the ignition switch is turned to the ON position. In this
case, drive the vehicle at a speed of more than 10 km/h {6.2 mph}, make sure the ABS warning light
goes out, and then clear the DTC.
• When repairing, if the DSC related connectors are disconnected and the ignition switch is turned to the
ON position, the control module will mistakenly detect a fault and record it as a malfunction.
Caution
• In DSC vehicles, when the DSC HU/CM, steering angle sensor, or combined sensor is replaced,
perform the initialization procedure for each sensor. (See 09-40-8 STEERING ANGLE SENSOR
INITIALIZATION PROCEDURE.) (See 04-15-17 COMBINED SENSOR INITIALIZATION PROCEDURE.)
SYMPTOM TROUBLESHOOTING
Condition under which the
light may illuminate
Under any of the following
conditions:
• When the front wheels are
jacked up, stuck, or placed
on a chassis roller, and
only the front wheel ABS
wheel speed sensors are
spun for 20 s or more.
Parking brake is not fully
released while driving.
Brake drag.
Sudden
acceleration/deceleration.
Left/right or front/rear tires are
different. (Size, radius, tire
pressure, or wear is other than
that listed on tire label.)
Battery voltage at DSC HU/
CM ignition terminal drops
below approx. 10 V.
Brake fluid amount is low.
Conditions under which the
light will go out
After turning ignition switch
off, vehicle is driven at speed
greater than 10 km/h {6.2
mph} and normal operation is
confirmed.
Battery voltage rises above
approx. 10 V.
Brake fluid level lower than
recommended amount.
id040300800200
id040300800300
ABS, EBD, TCS and DSC
control
• ABS: Disables control.
• EBD:
1. Disable control, in
cases where the light
may illuminate, only
when ABS 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.
ABS: Disables control.
EBD: Enables control.
TCS: Disables control.
DSC: Disables control.
ABS: Enables control.
EBD: Enables control.
TCS: Enables control.
DSC: Enables control.
04-03–3
04-03