Mazda CX 7. Manual — part 206

SYMPTOM TROUBLESHOOTING

04-03–9

04-03

NO.2 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING
LIGHT, DSC INDICATOR LIGHT AND/OR TCS OFF LIGHT)

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Diagnostic procedure

End Of Sie

2

Any of the following lights remain on: (ABS warning light, BRAKE system warning light, DSC
indicator light and/or TCS OFF light)

[TROUBLESHOOTING HINTS]

• Brake fluid amount is low

• Parking brake does not release

• No connection at DSC HU/CM connector

(When DSC HU/CM connector is disconnected, ABS warning light and BRAKE system warning light illuminate)

• DSC HU/CM detected malfunction (Input and output device malfunction)

• DSC HU/CM detects low voltage in power supply

• DSC HU/CM ground malfunction

(When DSC HU/CM ground is not securely connected, ABS warning light and BRAKE system warning light
illuminate but diagnostic trouble code does not displayed)

• DSC HU/CM does not operate (DSC HU/CM malfunction)

STEP

INSPECTION

ACTION

1

INSPECT BRAKE FLUID AMOUNT AND
VERIFY THAT PARKING BRAKE RELEASES

• Is the brake fluid amount normal?

• Is the parking brake lever released?

Yes

Go to the next step.

No

Add brake fluid or release parking brake lever.

2

INSPECT DTCS IN INSTRUMENT CLUSTER

• Inspect the DTC for the instrument cluster

ON-BOARD DIAGNOSTIC SYSTEM.

• Has DTC U2064 been recorded in memory?

Yes

Go to the next step.

No

Inspect the instrument cluster.
(See 09-22-3 INSTRUMENT CLUSTER INSPECTION.)

3

INSPECT DTCS IN DSC HU/CM

• Inspect the DTC for the DSC ON-BOARD

DIAGNOSTIC SYSTEM.

• Have DTCs been stored in memory?

Yes

Perform inspection using appropriate DTC.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

No

Go to the next step.

4

INSPECT WHETHER MALFUNCTION IS IN
CONTROL MODULE CONNECTOR,
TERMINAL OR OTHER

• Do the ABS warning light and BRAKE

system warning light go out after 4 s when
the ignition switch is turned to the ON
position?

Yes

Temporary poor connection in control module connector.
Inspect DSC HU/CM connector, then go to Step 7.
Inspect DSC HU/CM connector terminal, then go to Step 8.

No

Go to the next step.

5

INSPECT BATTERY

• Is the battery voltage normal?

Yes

Go to the next step.

No

Inspect the battery and charging system.
(See 01-17-2 BATTERY INSPECTION[L3 WITH TC].)
(See 01-17-6 GENERATOR INSPECTION[L3 WITH TC].)

6

INSPECT CHARGING SYSTEM

• Is the battery voltage normal with electrical

load (A/C, headlight, etc.) on and engine
idling?

Yes

Go to the next step.

No

Inspect the charging system (drive belt tension, generator,
etc.).
(See 01-17-6 GENERATOR INSPECTION[L3 WITH TC].)

7

VERIFY THAT DSC HU/CM CONNECTOR IS
CONNECTED

• Is the DSC HU/CM securely connected?

Yes

Go to the next step.

No

Connect the DSC HU/CM connector securely, then go to the
next step.

8

VERIFY THAT DSC HU/CM CONNECTOR
TERMINAL OR RELATED CONNECTOR
TERMINALS ARE CONNECTED

• Are the DSC HU/CM connector terminal or

instrument cluster connector terminal etc.
related connector terminals securely
connected?

Yes

Replace the DSC HU/CM.
(See 04-15-6 DSC HU/CM REMOVAL/INSTALLATION.)

No

Securely connect the DSC HU/CM connector terminal and
related connector terminals.

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SYMPTOM TROUBLESHOOTING

04-03–10

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

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Diagnostic procedure

End Of Sie

NO.4 ABS OR TCS

*1

OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY

*1

: DSC SYSTEM

FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF
WHILE DSC IS OPERATING

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Diagnostic procedure

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3

There is a malfunction in the system even though the ABS warning light, BRAKE system warning
light, DSC indicator light and TCS OFF light do not illuminate.

[TROUBLESHOOTING HINTS]

• There is a mechanical malfunction in system

STEP

INSPECTION

ACTION

1

INSPECT DSC HU/CM FOR DTCs

• Inspect the DTC for the DSC ON-BOARD

DIAGNOSTIC SYSTEM.

• Have DTCs been stored in memory?

Yes

Perform the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

No

Go to the next step.

2

INSPECT DSC SYSTEM

• Perform DSC system inspection.

(See 04-15-4 DSC SYSTEM INSPECTION.)

• Is the system normal?

Yes

Inspect the conventional brake system.

No

Repair or replace any malfunctioning part.

4

ABS or TCS (*1) operates frequently./TCS does not work correctly.
(*1): DSC system function contains traction control function; DSC indicator light goes on and off
while DSC is operating.

[TROUBLESHOOTING HINTS]

• There is a difference in size or air pressure between the front and rear tires

• Incorrect ABS wheel-speed signal is input to DSC HU/CM

• There is a malfunction in the engine control system (TCS malfunction)

• Tire problem (low or high air pressure, excessive wear, different grip level by four wheels)

STEP

INSPECTION

ACTION

1

INSPECT DTCS IN DSC HU/CM

• Inspect the DTC for the DSC ON-BOARD

DIAGNOSTIC SYSTEM.

• Have DTCs been stored in memory?

Yes

Perform the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

No

Go to the next step.

2

INSPECT TIRE SIZE AND AIR PRESSURE

• Inspect the tire size and the air pressure.

• Are size and air pressure as specified?

Yes

Go to the next step.

No

Replace with specified tires and adjust tire air pressure.

3

INSPECT ABS WHEEL-SPEED SENSOR
OUTPUT VALUE

• Inspect the output value from the ABS

wheel-speed sensor.
(See 04-15-12 FRONT ABS WHEEL-SPEED
SENSOR INSPECTION.)
(See 04-15-14 REAR ABS WHEEL-SPEED
SENSOR INSPECTION[2WD].)
(See 04-15-14 REAR ABS WHEEL-SPEED
SENSOR INSPECTION[AWD].)

• Is the output value normal?

Yes

Go to the next step.

No

• ABS wheel-speed sensor installation inspection:

Inspect the sensor for looseness and verify that it is
securely installed.

• Sensor rotor installation inspection:

Inspect the sensor rotor for poor installation and
chipping of sensor rotor teeth. (If sensor rotor is installed
poorly, it may cause output of abnormal wave form at
high speed.)

4

VERIFY THAT TIRE CONDITION

• Verify tire condition for following:

— Wear

— Grip level (different by four wheels)

• Are tires condition okay?

Yes

Find malfunctioning part according to "INTERMITTENT
CONCERN TROUBLESHOOTING".

No

Adjust, repair or replace tire.

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SYMPTOM TROUBLESHOOTING

04-03–11

NO.5 DSC

*2

OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY

*2

: DSC INDICATOR LIGHT

GOES ON AND OFF WHILE DSC IS OPERATING

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Diagnostic procedure

End Of Sie

5

DSC (*2) operates frequently. /DSC does not work correctly.
(*2): DSC indicator light goes on and off while DSC is operating.

[TROUBLESHOOTING HINTS]

• DSC HU/CM detected malfunction (input and output device malfunction)

• Poor installation of yaw rate sensor, lateral-G sensor and/or steering angle sensor

(If any of the above sensors are poorly installed, DSC may operate intermittently)

• When replacing the DSC HU/CM, combined sensor or steering angle sensor, initialization is not performed.

(If initialization is not performed correctly, DSC may not work correctly)

STEP

INSPECTION

ACTION

1

INSPECT DSC HU/CM FOR DTCs

• Inspect the DTC for the DSC ON-BOARD

DIAGNOSTIC SYSTEM.

• Have DTCs been recorded in memory?

Yes

Perform the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

No

Go to the next step.

2

VERIFY THAT EACH SENSOR IS INSTALLED

• Are the combined sensor and steering angle

sensor securely installed?

Yes

Go to the next step.

No

Install sensor securely.

*3

VERIFY THAT EACH SENSOR IS INITIALIZED

• Was initialization performed after

replacement of the DSC HU/CM, combined
sensor or steering angle sensor?

Yes

Go to the next step.

No

Perform initialization procedure.
(See 04-15-17 COMBINED SENSOR INITIALIZATION
PROCEDURE.)
(See 09-40-8 STEERING ANGLE SENSOR
INITIALIZATION PROCEDURE.)

4

VERIFY THAT TIRE CONDITION

• Verify tire condition for following:

— Air pressure

— Wear

— Grip level (different by four wheels)

• Are tires condition okay?

Yes

Find malfunctioning part according to "INTERMITTENT
CONCERN TROUBLESHOOTING".

No

Adjust, repair or replace tire.

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