Mazda X-5. Manual — part 56

ON-BOARD DIAGNOSTIC

04–02–3

04–02

ON-BOARD DIAGNOSTIC SYSTEM FUNCTION (ABS, DYNAMIC STABILITY CONTROL)

E5U040243750N02

Malfunction Detection Function

• The malfunction detection function detects malfunctions in the input/output signal system of the ABS HU/CM

(vehicles with ABS) or DSC HU/CM (vehicles with DSC) when the ignition switch is at the ON position.

• When the ABS HU/CM and DSC HU/CM are started up, the following malfunction detections are performed.

ABS HU/CM

— The ABS and brake system warning lights illuminate for approx. 3 s when the ignition switch is turned to

the ON position. At the same time, the fail-safe relay is operated, and the input/output signals of each part
is monitored for malfunction diagnosis. After starting to drive, the first time the vehicle speed is approx. 10
km/h {6.2 mph} or more the pump motor is operated and malfunction diagnosis is performed again.

DSC HU/CM

— The ABS and brake system warning lights, DSC OFF and DSC indicator lights illuminate for approx. 3 s

when the ignition switch is turned to the ON position. At the same time, the fail-safe relay is operated, and
the input/output signals of each part is monitored for malfunction diagnosis. After starting to drive, the first
time the vehicle speed is approx. 10 km/h {6.2 mph} or more the pump motor is operated and malfunction
diagnosis is performed again.

• When malfunctions are detected, the corresponding lights are illuminated to alert the driver. Using the external

tester communication function, DTCs can be output through the CAN_H and CAN_L of the DLC-2. At the same
time, malfunction detection results are sent to the memory and fail-safe functions.

Memory Function

• The memory function stores DTCs of malfunctions in input/output signal systems. With this function, once a

DTC is stored it is not cleared after the ignition switch has been turned off (LOCK position), even if the
malfunctioning signal system has returned to normal.

• Since the ABS HU/CM or DSC HU/CM has a built-in non-volatile memory, DTCs are not cleared even if the

battery is removed. Therefore, it is necessary to clear the memory after performing repairs. Refer to the
Workshop Manual for the DTC clearing procedure.

Fail-safe Function

• When the malfunction detection function determines a malfunction, each light illuminates to advise the driver.

At this time, the fail-safe function controls the ABS, EBD, TCS* and DSC* as shown in the fail-safe function
table.

*: Only vehicles with DSC

Warning

• If EBD control is suspended the rear wheels could lock-up before the front wheels. If this occurs,

the vehicle could swerve and become unstable. Therefore always inspect the system immediately
if EBD control is suspended.

ON-BOARD DIAGNOSTIC

04–02–4

Fail-safe Function Malfunction Contents (Vehicles With ABS)

*1

: If the ignition voltage returns to normal, the light goes out.

*2

: If the ignition voltage returns to normal, control is enabled.

Malfunction

location

DTC number

Fail-safe function

Warning light illumination status

Control status

WDS or

equivalent

display

ABS warning light

Brake system

warning light (when

parking brake is

released)

ABS control

EBD control

Power supply system

B1317

Illuminated

*1

Illuminated

*1

Control

disabled

*2

Control

disabled

*2

B1318

ABS HU/CM system

B1342

Illuminated

Illuminated

Control disabled

Control disabled

Brake switch signal
system

B1484

Not illuminated

Not illuminated

Control enabled

Control enabled

ABS HU/CM
configuration system

B2477

Flash

Not illuminated

Control disabled

Control enabled

ABS sensor rotor

C1141

Illuminated

Not illuminated

Control disabled

Control enabled

C1142

C1143

C1144

ABS wheel-speed
sensor system

C1145

C1148

C1155

C1158

C1165

C1168

C1175

C1178

ABS wheel-speed
sensor/ABS sensor
rotor systems

C1233

C1234

C1235

C1236

Solenoid valve
system

C1194

Illuminated

Illuminated

Control disabled

Control disabled

C1198

C1210

C1214

C1242

C1246

C1250

C1254

Valve relay system

C1186

Illuminated

Illuminated

Control disabled

Control disabled

C1266

Not illuminated

Control enabled

Pump motor, motor
relay systems

C1095

Illuminated

Illuminated

Control disabled

Control enabled

C1096

CAN communication
system

U0073

Not illuminated

Not illuminated

Control enabled

Control enabled

U1900

U2023

ON-BOARD DIAGNOSTIC

04–02–5

04–02

Fail-safe Function Malfunction Contents (Vehicles With DSC)

Malfunction

location

DTC

number

Fail-safe function

Warning light illumination status

Control status

WDS or

equivale

nt

Display

ABS

warning

light

Brake

system

warning

light (when

parking

brake is

released)

DSC

indicator

light

DSC OFF

light

ABS

control

EBD

Control

TCS

control

DSC

control

Power supply
system

B1317

Illuminated

*1

Illuminated

*1

Illuminated

*1

Not

illuminated

Control

disabled

*2

Control

disabled

*2

Control

disabled

*2

Control

disabled

*2

B1318

DSC HU/CM
system

B1342

Illuminated

Illuminated

Illuminated

Not

illuminated

Control

disabled

Control

disabled

Control

disabled

Control

disabled

C1730

Illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

disabled

Control

enabled

Control

disabled

Control

disabled

Brake switch
signal system

B1484

Illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

disabled

Control

enabled

Control

disabled

Control

disabled

C1954

DSC HU/CM
configuration
system

B2477

Flash

Not

illuminated

Flash

Not

illuminated

Control

disabled

Control

disabled

Control

disabled

Control

disabled

DSC OFF
switch system

C1093

Not

illuminated

Not

illuminated

Illuminated

Illuminated

Control

enabled

Control

enabled

Control

disabled

Control

disabled

Pump motor,
motor relay
systems

C1095

Illuminated

Illuminated

Illuminated

Not

illuminated

Control

disabled

Control

enabled

Control

disabled

Control

disabled

C1096

PCM
communication
system

C1134

Not

illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

enabled

Control

enabled

Control

disabled

Control

disabled

ABS sensor
rotor

C1141

Illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

disabled

Control

enabled

Control

disabled

Control

disabled

C1142

C1143

C1144

ABS wheel-
speed sensor
system

C1145

C1155

C1165

C1175

C1233

C1234

C1235

C1236

ABS wheel-
speed sensor/
ABS sensor
rotor systems

C1148

C1158

C1168

C1178

ABS wheel-
speed sensor
(slip monitor)
system

C1222

Illuminated

Illuminated

Illuminated

Not

illuminated

Control

disabled

Control

disabled

Control

disabled

Control

disabled

Valve relay
system

C1186

Illuminated

Illuminated

Illuminated

Not

illuminated

Control

disabled

Control

disabled

Control

disabled

Control

disabled

C1266

Not

illuminated

Illuminated

Control

enabled

ON-BOARD DIAGNOSTIC

04–02–6

*1

: If the ignition voltage returns to normal, the light goes out.

*2

: If the ignition voltage returns to normal, control is enabled.

*3

: Light goes out if the malfunction is repaired.

*4

: Control enabled if the malfunction is repaired.

End Of Sie

Solenoid valve
system

C1194

Illuminated

Illuminated

Illuminated

Not

illuminated

Control

disabled

Control

disabled

Control

disabled

Control

disabled

C1198

C1210

C1214

C1242

C1246

C1250

C1254

C1400

C1410

C1957

C1958

Brake fluid
pressure sensor
system

C1288

Illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

disabled

Control

enabled

Control

disabled

Control

disabled

C1290

C1953

Steering angle
sensor system

C1295

Not

illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

enabled

Control

enabled

Control

disabled

Control

disabled

C1306

Flash

C1307

Not

illuminated

C1937

C1938

C1956

Combined
sensor system

C1279

Not

illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

enabled

Control

enabled

Control

disabled

Control

disabled

C1280

C1281

C1282

C1951

C1952

C1959

C2768

Incorrect DSC
HU/CM
installed

C1805

Illuminated

Illuminated

Illuminated

Not

illuminated

Control

disabled

Control

disabled

Control

disabled

Control

disabled

DSC HU/CM
control system

C1994

Illuminated

*3

Not

illuminated

Illuminated

*3

Not

illuminated

Control

disabled

*4

Control

enabled

Control

disabled

*4

Control

disabled

*4

CAN
communication
system

U0073

Not

illuminated

Not

illuminated

Illuminated

Not

illuminated

Control

enabled

Control

enabled

Control

disabled

Control

disabled

U0100

U0101

U0155

U1900

U2023

Malfunction

location

DTC

number

Fail-safe function

Warning light illumination status

Control status

WDS or

equivale

nt

Display

ABS

warning

light

Brake

system

warning

light (when

parking

brake is

released)

DSC

indicator

light

DSC OFF

light

ABS

control

EBD

Control

TCS

control

DSC

control