ON-BOARD DIAGNOSTIC SYSTEM FUNCTION [DYNAMIC STABILITY CONTROL (DSC)]

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Malfunction detection function

•  The malfunction detection function detects and displays malfunctions in the input/output signal system of the DSC HU/CM when the ignition switch is at the ON position.
•  When the DSC HU/CM is activated, the following malfunction detection is performed.
―  The ABS and brake system warning lights, DSC indicator lights and DSC OFF light 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. Input/output signals are monitored for malfunction determination when the ignition is switched to ON.
•  If the above malfunctions are detected, the corresponding lights are illuminated to alert the driver. DTCs can be output through the CAN_H and CAN_L of the DLC-2 using the external tester communication function. 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 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 malfunction contents table.
Warning
•  If EBD control is prohibited the rear wheels could lock-up before the front wheels.If this occurs, the vehicle could yaw and become unstable. Therefore always inspect the system immediately if EBD control is prohibited.

Fail-safe Function Malfunction Contents

Malfunction location

DTC number

Fail-safe function

Warning light illumination status

Control status

Mazda Modular Diagnostic System (M-MDS) 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

Brake control

Engine control
Power supply system
B1317
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
Control disabled
B1318
Illuminated
*1
Not illuminated
*2
Illuminated
*1
Control disabled
*3
Control enabled
*4
Control disabled
*3
Control disabled
*3
Control disabled
*3
DSC HU/CM system
B1342
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
Control disabled
Brake switch system
B1484
Illuminated
*5
Not illuminated*18
Illuminated
Not illuminated
Control disabled
*6
Control enabled
Control disabled
*6
Control disabled
*6
Control disabled
C1954
DSC HU/CM configuration
B2477
Illuminated
*7
Not illuminated
Illuminated
*7
Not illuminated
Control disabled
Control enabled
Control disabled
Control disabled
Control disabled
Combined sensor system
B2741
Not illuminated
Not illuminated
Illuminated
Not illuminated
Control enabled
Control enabled
Control disabled
*8
Control disabled
*8
Control disabled
C2768
U2516
DSC OFF switch system
C1093
Not illuminated
Not illuminated
Illuminated
Illuminated
Control enabled
Control enabled
Control disabled
Control disabled
Control disabled
Pump motor, motor relay systems
C1095
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control enabled
Control disabled
Control disabled
Control disabled
C1096
LF ABS sensor rotor
C1141
Illuminated
Not illuminated
Illuminated
Not illuminated
Control disabled
*9
Control enabled
Control disabled
Control disabled
Control disabled
RF ABS sensor rotor
C1142
LR ABS sensor rotor
C1143
RR ABS sensor rotor
C1144
RF ABS wheel-speed sensor system
C1145
Illuminated
Not illuminated
Illuminated
Not illuminated
Control disabled
*9
Control enabled
Control disabled
Control disabled
Control disabled
LF ABS wheel-speed sensor system
C1155
RR ABS wheel-speed sensor system
C1165
LR ABS wheel-speed sensor system
C1175
RF ABS wheel-speed sensor/ABS sensor rotor systems
C1148
Illuminated
Not illuminated
Illuminated
Not illuminated
Control disabled
*9
Control enabled
Control disabled
Control disabled
Control disabled
LF ABS wheel-speed sensor/ABS sensor rotor systems
C1158
RR ABS wheel-speed sensor/ABS sensor rotor systems
C1168
LR ABS wheel-speed sensor/ABS sensor rotor systems
C1178
Valve relay system
C1186
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
Control disabled
C1266
Not illuminated
Control enabled
LF outlet solenoid valve system
C1194
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
Control disabled
LF inlet solenoid valve system
C1198
RF outlet solenoid valve system
C1210
RF inlet solenoid valve system
C1214
LR outlet solenoid valve system
C1242
RR outlet solenoid valve system
C1246
LR inlet solenoid valve system
C1250
RR inlet solenoid valve system
C1254
RH traction control solenoid valve system
C1400
LH traction control solenoid valve system
C1410
RH stability control solenoid valve system
C1957
LH stability control solenoid valve system
C1958
ABS wheel-speed sensor (slip monitor) system
C1222
Illuminated
Illuminated
*10
Illuminated
Not illuminated
Control disabled
*11
Control disabled
*12
Control disabled
Control disabled
Control disabled
LF ABS wheel-speed sensor system
C1233
Illuminated
Not illuminated
Illuminated
Not illuminated
Control disabled
*9
Control enabled
Control disabled
Control disabled
Control disabled
RF ABS wheel-speed sensor system
C1234
RR ABS wheel-speed sensor system
C1235
LR ABS wheel-speed sensor system
C1236
Combined sensor system
C1279
Not illuminated
Not illuminated
Illuminated
Not illuminated
Control enabled
Control enabled
Control disabled
*8
Control disabled
*8
Control disabled
C1280
Illuminated
*13
Control disabled
*8, 14
Control disabled
*8, 14
Control disabled
*14
C1281
Illuminated
Control disabled
*8
Control disabled
*8
Control disabled
C1952
Illuminated
*15
Control disabled
*8, 16
Control disabled
*8, 16
C1959
Illuminated
Control disabled
*8
Control disabled
*8
Brake fluid pressure sensor system
C1290
Illuminated
*17
Not illuminated
Illuminated
Not illuminated
Control disabled
*9
Control enabled
Control disabled
*8
Control disabled
*8
Control disabled
C1953
Steering angle sensor system
C1295
Not illuminated
Not illuminated
Illuminated
Not illuminated
Control enabled
Control enabled
Control disabled
*8
Control disabled
*8
Control disabled
C1307
C1937
C1938
Illuminated
*13
Control disabled
*8, 14
Control disabled
*8, 14
Control disabled
*14
C1956
Illuminated
Control disabled
*8
Control disabled
*8
Control disabled
Steering angle sensor (abnormal initialization) system
C1306
Not illuminated
Not illuminated
Illuminated
Flash
Control enabled
Control enabled
Control disabled
*8
Control disabled
*8
Control disabled
DSC control system
C1994
Illuminated
Not illuminated
Illuminated
Not illuminated
Control disabled
Control enabled
Control disabled
Control disabled
Control disabled
CAN communication system
U0073
Not illuminated
Not illuminated
Illuminated
Not illuminated
Control enabled
Control enabled
Control disabled
Control disabled
Control disabled
U0100
U0101
U0155
U1900
U2023
CAN2 communication system
U0074
Not illuminated
Not illuminated
Illuminated
Not illuminated
Control enabled
Control enabled
Control disabled
*8
Control disabled
*8
Control disabled
U0123
U1901

*1  :If the ignition voltage returns to normal, the light turns off.
*2  :If the ignition voltage is less than 7.6 V, the light illuminates. Afterwards, if the ignition voltage returns to normal, the light turns off.
*3  :If the ignition voltage returns to normal, control is enabled.
*4  :If the ignition voltage is less than 7.6 V, control is disabled. Afterwards, if the ignition voltage returns to normal, control is enabled.
*5  :If an error is detected during the ABS/TCS control, the light illuminates after finishing the control.
*6  :If an error is detected during the ABS/TCS control, the control is disabled after finishing the control.
*7  :If the configuration data is not within the specification, the light flashes.
*8  :If an error is detected during the TCS control, the control is disabled after finishing the control.
*9  :If an error is detected during the ABS control, the control is disabled after finishing the control.
*10  :If an abnormal cornering direction is detected, the light does not illuminate.
*11  :If an abnormal cornering direction is detected during the ABS control, the control is disabled after finishing the control.
*12  :If an abnormal cornering direction is detected, the control is not disabled.
*13  :When an abnormal cornering direction is detected, the light turns off if the normal condition is verified the next time the system is activated.
*14  :When an abnormal cornering direction is detected, control is enabled if the normal condition is verified the next time the system is activated.
*15  :If the system returns to normal, the light turns off. However, if another error is detected within 180 s, the light remains illuminated until the ignition switch is turned off.
*16  :If the system returns to normal, control is enabled. However, if another error is detected within 180 s, control is disabled until the ignition switch is turned off.
*17  :If an error is detected during the ABS control, the light illuminates after finishing the control.
*18  :Illuminates the brake system warning light (vehicle without the malfunction warning light) or malfunction warning light (vehicle equipped with the malfunction warning light) (applied VIN (assumed) FE10**301152—).