Mazda Training manual — part 102

Dynamic Driving Safety Systems

DSC

Diagnostics

•

The steering angle sensor can be checked by:

–

Reading out DTCs

–

Checking voltage signals

–

Monitoring the corresponding PID (see below)

PID

Definition Unit/Condition

SWA_POS

Steering angle sensor

°

L2003_T02026

NOTE: The steering angle sensor does not have any serviceable parts, regardless of its

type. Whenever a malfunction occurs, it needs to be replaced as a unit. Depending
on the vehicle, the sensor must be initialised after it had been disconnected from the
power supply (refer to W/M). The steering wheel must be turned fully to the left and
then fully to the right with the engine idling. Afterwards, the DSC indicator light will
turn off. Then the ignition has to be switched off and then back on, and it must be
confirmed that the DSC indicator light stays off after a 10 minute test drive.

Replacement

•

On some models, the steering angle sensor needs to be programmed with the aid of the
M-MDS, after the sensor or the DSC HU/CM has been replaced (refer to W/M).

Brake Fluid Pressure Sensor

•

Depending on the model, the brake fluid pressure sensor is attached to or incorporated
in the DSC HU/CM or attached to the brake master cylinder (see W/M). A brake fluid
pressure sensor that is attached to the DSC HU/CM cannot be replaced as a single part.
If it has a malfunction, the entire DSC HU/CM must be replaced.

Curriculum Training

02-67

DSC

Dynamic Driving Safety Systems

Diagnostics

•

The brake fluid pressure sensor can be checked by:

–

Reading out DTCs

–

Checking voltage signals

–

Monitoring / Activating the corresponding PIDs (see below)

PID

Definition Unit/Condition

MCYL_S_CAL#

Initalisation start-up for brake fluid pressure sensor

True/False

MPRETDR

Brake fluid pressure

kPa, psi, bar

L2003_T02027

Replacement

•

If a DSC HU/CM has been replaced, the brake fluid pressure sensor must be initialised
with the aid of the M-MDS (depending on the model, refer to W/M).

DSC Indicator Light

•

The yellow DSC indicator light is located in the IC. It illuminates after ignition on for a few
seconds to inform the driver that the indicator light has no malfunction. During driving, it
flashes whenever DSC operates, to visually inform the driver that the system is currently
operating.

•

If it stays on or illuminates without flashing during driving, a malfunction has been
detected. An illuminated indicator light does not necessarily indicate that the system is
disabled. It only indicates that the driver should have the system inspected as soon as
possible. All current Mazda vehicles feature a DTC memory function. The malfunction is
stored in the DSC HU/CM.

02-68 Curriculum

Training

Dynamic Driving Safety Systems

DSC

NOTE: Current Mazda vehicles with DSC do not feature a separate TCS indicator light. The

DSC indicator light is used for both, the DSC and the TCS. Depending on the model,
the speed of flashing may vary between TCS and DSC operation.

L2003_02039

1

IC

2

DSC indicator light

Diagnostics

•

The DSC indicator light can be checked by:

–

Visually inspecting the indicator light after switching the ignition on

–

Using the input/output check mode for the IC

–

Monitoring/Activating the corresponding PID (see below)

PID

Definition

Unit/Condition

STAB_IND

DSC / TCS indicator light

ON / OFF

L2003_T02021

Curriculum Training

02-69

DSC

Dynamic Driving Safety Systems

DSC OFF Indicator Light

•

The yellow DSC OFF indicator light is located in the IC. It illuminates after ignition on for
a few seconds to inform the driver that the indicator light has no malfunction. It is also
illuminated when the DSC is switched off by the driver or due to a malfunction.

•

If it illuminates without the DSC having been switched off by the driver, a malfunction is
detected. All current Mazda vehicles feature a DTC memory function. The malfunction is
stored in the DSC HU/CM.

NOTE: On vehicles without electronic throttle valve, the DSC OFF indicator light might stay

illuminated after the engine has been started at an engine coolant temperature
below 0° C. Because, the system is automatically disabled until the engine coolant
temperature reaches a specified value (depending on the model approx. 35° C), to
avoid engine running problems caused by changing the ignition timing of the cold
engine. This does not indicate a malfunction.

NOTE: Current Mazda vehicles with DSC do not feature a separate TCS OFF indicator light.

The DSC OFF indicator light is used as indicator for both, the DSC and the TCS.

NOTE: Depending on the vehicle, the DSC OFF indicator light might flash after the vehicle’s

battery had been disconnected. In this case, the initalisation procedure for the
steering angle sensor needs to be performed.

L2003_02040

1

IC

2

DSC OFF indicator light

02-70 Curriculum

Training