Mazda CX 7. Manual - part 205

SYMPTOM TROUBLESHOOTING 

04-03–5

04-03

4. 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 sensors

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

Note

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

3. Access PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger.

• If the PID value is unstable or a malfunction occurs, inspect for poor connection and/or poorly mounted 

sensor.

Malfunction data monitor method

1. Perform the malfunction reappearance test according to malfunction reappearance mode and malfunction data 

monitor. The malfunction cause is found in the malfunction data.

Inspection method for connector terminal 

1. Inspect the connection condition of each female terminal.
2. Insert the male terminal, and fit the female 

terminal side to female terminal. Inspect if the 
malfunction is in the female terminal.

End Of Sie

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SYMPTOM TROUBLESHOOTING 

04-03–6

SYMPTOM TROUBLESHOOTING

id040300800400

• Verify the symptoms, and perform troubleshooting according to the appropriate number.

*1

:  DSC system contains traction control function; DSC indicator light illuminates and goes out while DSC is 

operating.

*2

:  DSC indicator light illuminates and goes out while DSC is operating.

No.

Symptom

1

Any of the following lights do not illuminate when the ignition switch is turned to the ON position.

• ABS warning light

• BRAKE system warning light

• DSC indicator light

• TCS OFF light

2

Any of the following lights remain on:

• ABS warning light.

• BRAKE system warning light

• DSC indicator light

• TCS OFF light

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.

4

ABS or TCS

*1

 operates frequently.

TCS does not work correctly.

5

DSC

*2

 operates frequently.

DSC does not work correctly.

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SYMPTOM TROUBLESHOOTING 

04-03–7

04-03

End Of Sie

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

CAN comm

unication

X

X

Troubleshooting item

Any of the following lights do not illuminate 
when the ignition switch is turned to the on 
position: (ABS warning light, BRAKE system 
warning light, DSC indicator light and/or TCS 
OFF light).

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

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

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

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

1

3

4

5

2

Possible factor

x: Applicable

DSC HU/CM

Instr

ument cluster

Each sensor installation

Batter

y

Charging system

Br

ak

e fluid

P

a

rking br

ak

e

Tire

Tire air pressure

Control module po

w

er supply system

Control module g

round system

Instr

ument cluster po

w

er supply system

Instr

ument cluster g

round system

Con

v

entional br

ak

e

DSC system contains traction control function; DSC indicator light illuminates and goes out while DSC is 
operating.
DSC indicator light illuminates and goes out while DSC is operating.

*1:

*2:

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SYMPTOM TROUBLESHOOTING 

04-03–8

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)

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Diagnostic procedure

End Of Sie

1

Any of the following lights do not illuminate when the ignition switch is turned to the ON position: 
(ABS warning light, BRAKE system warning light, DSC indicator light and/or TCS OFF light).

[TROUBLESHOOTING HINTS]

• Inspect each light in the instrument cluster for malfunction

• Poor connection at DSC HU/CM connector

STEP

INSPECTION

ACTION

1

INSPECT FOR 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 WHETHER MALFUNCTION IS IN 
INSTRUMENT CLUSTER SYSTEM OR OTHER 
SYSTEM

• Do other warning and indicator lights 

illuminate when the ignition switch is turned 
to the ON position?

Yes

Go to the next step.

No

Inspect or repair the instrument cluster (power supply 
system, ground system).

3

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.

4

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

• Are DSC HU/CM connector terminal, 

instrument cluster connector terminal, or 
related connector terminals securely 
connected?

Yes

Go to the next step.

No

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

5

INSPECT INSTRUMENT CLUSTER

• Inspect the instrument cluster. 

(See 04-02-3 ON-BOARD DIAGNOSIS.)

• If the instrument cluster normal

Yes

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

No

Replace the instrument cluster.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

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