Mazda CX-9 Grand Touring. Manual - part 126



After repair, it is necessary to clear the DTC from the control module memory.

Also, if the DSC/RSC 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/RSC 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.



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/RSC
component or the conventional brake system.



The hydraulic unit contains delicate mechanical parts. If foreign material gets into the
component, the DSC/RSC 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/RSC
does not. Make sure foreign material does not enter when servicing the DSC/RSC (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.

WARNING:



If the DSC/RSC sensor initialization procedure is not
completed, it could result in an unexpected accident due
to the DSC/RSC being inoperative. Therefore, after the
DSC/RSC HU/CM or combined sensor is replaced, always
perform the DSC/RSC sensor initialization precedure to
ensure proper DSC/RSC operation. (See DSC/RSC
SENSOR INITIALIZATION PROCEDURE .)

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.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

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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).

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.

Fig. 2: Identifying DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.

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).



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.

NOTE:



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

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

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3. Access PIDs for the switch you are inspecting.

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.

Fig. 3: Shaking Connector Or Wiring Harness
Courtesy of MAZDA MOTORS CORP.

Inspection method for sensors

1. Connect the M-MDS to DLC-2.

2. Turn the ignition switch to the ON position (engine off).

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

NOTE:



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

NOTE:



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

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

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Sunday, November 15, 2009 9:41:34 AM

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in the female terminal.

Fig. 4: Inspecting Connection
Courtesy of MAZDA MOTORS CORP.

SYMPTOM TROUBLESHOOTING [DSC/RSC]



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

SYMPTOM TROUBLESHOOTING [DSC/RSC]

No.

Symptom

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

Any of the following lights remain on:



ABS warning light.



BRAKE system warning light



DSC indicator light



TCS OFF light

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.

ABS or TCS

(1)

operates frequently.

TCS does not work correctly.

DSC

(1)

operates frequently.

DSC does not work correctly.

RSC

(1)

operates frequently.

RSC does not work correctly.

(1)

DSC/RSC system contains traction control, dynamic stability control and roll stability control
function; DSC indicator light illuminates and goes out while DSC/RSC is operating.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

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Sunday, November 15, 2009 9:41:34 AM

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