Mazda CX 7. Manual - part 204

SYMPTOM TROUBLESHOOTING

04-03–1

04-03

SYMPTOM TROUBLESHOOTING

SYSTEM WIRING DIAGRAM  . . . . . . . . .  04-03–2
FOREWORD . . . . . . . . . . . . . . . . . . . . . .  04-03–3
PRECAUTION . . . . . . . . . . . . . . . . . . . . .  04-03–3

Intermittent Concern

Troubleshooting . . . . . . . . . . . . . . . . . 04-03–4

SYMPTOM TROUBLESHOOTING . . . . . 04-03–6
NO.1 ANY OF THE FOLLOWING

LIGHTS DO NOT ILLUMINATE
WHEN IGNITION SWITCH TURNED
TO ON POSITION: (ABS WARNING
LIGHT, BRAKE SYSTEM WARNING
LIGHT, DSC INDICATOR LIGHT
AND/OR TCS OFF LIGHT) . . . . . . . . . . 04-03–8

NO.2 ANY OF THE FOLLOWING

LIGHTS REMAIN ON: (ABS WARNING
LIGHT, BRAKE SYSTEM WARNING
LIGHT, DSC INDICATOR LIGHT
AND/OR TCS OFF LIGHT) . . . . . . . . . . 04-03–9

NO.3 THERE IS A MALFUNCTION

IN THE SYSTEM EVEN THOUGH
ABS WARNING LIGHT, BRAKE SYSTEM
WARNING LIGHT, DSC INDICATOR
LIGHT AND TCS OFF LIGHT DO NOT
ILLUMINATE. . . . . . . . . . . . . . . . . . . . . . 04-03–10

NO.4 ABS OR TCS

OPERATES

FREQUENTLY/TCS DOES NOT
WORK CORRECTLY

DSC SYSTEM FUNCTION CONTAINS
TRACTION CONTROL FUNCTION, DSC
INDICATOR LIGHT GOES ON AND
OFF WHILE DSC IS OPERATING . . . . . 04-03–10

NO.5 DSC

OPERATES

FREQUENTLY/DSC DOES NOT
WORK CORRECTLY

DSC INDICATOR LIGHT GOES ON
AND OFF WHILE DSC IS
OPERATING . . . . . . . . . . . . . . . . . . . . . . 04-03–11

End of Toc

WM: DYNAMIC STABILITY CONTROL

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SYMPTOM TROUBLESHOOTING

04-03–2

SYSTEM WIRING DIAGRAM

id040300800100

End Of Sie

F
E

G
H

A
B
D

BRAKE SWITCH

TSC OFF SWITCH

COMBINED
SENSOR

STEERING
ANGLE
SENSOR

ABS 1 40A

ABS 2 20A

IG 1

CAN_H

CAN_L

BCM

ABS WHEEL-
SPEED SENSOR

CAN
DRIVER

PCM

TCM

CAN
DRIVER

CAN_H

CAN_L

CAN_H

CAN_L

DLC-2

CAN
DRIVER

BRAKE SYSTEM
WARNING LIGHT

ABS WARNING
LIGHT

TSC OFF LIGHT

DSC INDICATOR
LIGHT

DSC HU/CM

INSTRUMENT CLUSTER

IG SW

BATTERY

DSC 7.5A

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SYMPTOM TROUBLESHOOTING

04-03–3

04-03

FOREWORD

id040300800200

• 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

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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.

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.)

Warning lights that may
illuminate and/or flash

Condition under which the
light may illuminate

Conditions under which the
light will go out

ABS, EBD, TCS and DSC
control

• ABS warning light

• BRAKE system warning

light

• DSC indicator light

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.

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.

• 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.

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.

Battery voltage rises above
approx. 10 V.

ABS: Disables control.
EBD: Enables control.
TCS: Disables control.
DSC: Disables control.

• Brake system warning

light

Brake fluid amount is low.

Brake fluid level lower than
recommended amount.

ABS: Enables control.
EBD: Enables control.
TCS: Enables control.
DSC: Enables control.

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SYMPTOM TROUBLESHOOTING

04-03–4

• To protect the control module, make sure the ignition is off before connecting or disconnecting the

control module connector.

(2) Malfunctions in hydraulic system

• Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction.

However, it is necessary to determine if the malfunction is in a DSC component or the conventional
brake system.

• The hydraulic unit contains delicate mechanical parts. If foreign material gets into the component, the

DSC may fail to operate. Also, it will likely become extremely difficult to find the location of the
malfunction in the event that the brakes operate but the DSC does not. Make sure foreign material does
not enter when servicing the DSC (e.g.brake fluid replacement, pipe removal).

Intermittent Concern Troubleshooting
Vibration method

• If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating,

perform the following steps.

Note

• There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Inspect

the following:

— Connectors not fully seated.

— Wire harnesses not having full play.

— Wires laying across brackets or moving parts.

— Wires routed too close to hot parts.

• An improperly routed, improperly clamped, or loose harness can cause wiring to become pinched

between parts.

• The connector joints, points of vibration, and places where wiring harnesses pass through the firewall,

body and other panels are the major areas to be inspected.

Inspection method for switch connectors or wires

1. Connect the M-MDS to DLC-2.
2. Turn the ignition switch to the ON position (engine off).

Note

• If the engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.
4. Turn the switch on manually.
5. Slightly shake each connector or wiring harness

vertically and horizontally while monitoring the
PID.

• If the PID value is unstable, inspect for poor

connection.

Inspection method for sensor connectors or wires

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position (engine off).

Note

• If the engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.

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