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 turned to 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. 3.0 s when the ignition switch is turned to the ON position to inspect for open circuits in the lights. 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 switch is at the ON position.
•  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 No.

Fail-safe function

Warning light illumination status

Control status

Mazda Modular Diagnostic System (M-MDS) display

ABS warning light

Brake system warning light (parking brake released)

DSC indicator light

DSC OFF light

ABS control

EBD control

TCS Control

DSC Control

Brake control

Engine control
DSC HU/CM internal malfunction (Traction control solenoid valve system)
C0001:01
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
C0002:01
DSC HU/CM internal malfunction (Stability control solenoid valve system)
C0003:01
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
C0004:01
DSC HU/CM internal malfunction (LF inlet solenoid)
C0010:01
Illuminated
Illuminated
Illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
DSC HU/CM internal malfunction (LF outlet solenoid)
C0011:01
DSC HU/CM internal malfunction (RF inlet solenoid)
C0014:01
DSC HU/CM internal malfunction (RF outlet solenoid)
C0015:01
DSC HU/CM internal malfunction (LR inlet solenoid)
C0018:01
DSC HU/CM internal malfunction (LR outlet solenoid)
C0019:01
DSC HU/CM internal malfunction (RR inlet solenoid)
C001C:01
DSC HU/CM internal malfunction (RR outlet solenoid)
C001D:01
Pump motor, motor relay
C0020:01
Illuminated
Not illuminated
Illuminated
Not illuminated
Control disabled
Control enabled
Control disabled
Control disabled
C0020:1C
C0020:71
ABS sensor rotor
C0030:07
Illuminated
Not illuminated*1
Illuminated
Not illuminated
Control disabled
Control enabled*2
Control disabled
Control disabled
C0033:07
C0036:07
C0039:07
ABS wheel
speed sensor
C0031:01
Illuminated
Not illuminated*1
Illuminated
Not illuminated
Control disabled
Control enabled*2
Control disabled
Control disabled
C0034:01
C0037:01
C003A:01
ABS wheel-speed sensor/ABS sensor rotor
C0031:07
Illuminated
Not illuminated*1
Illuminated
Not illuminated
Control disabled
Control enabled*2
Control disabled
Control disabled
C0034:07
C0037:07
C003A:07
Brake switch
C0040:64
Not illuminated
Not illuminated
Not illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control enabled
Brake fluid pressure sensor
C0044:01
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control disabled
Control disabled
C0044:28
C0044:64
TCS/DSC control system
C0072:68
Not illuminated
Control disabled
Control enabled
Control enabled
Abnormal message from EPS control module
C0051:28
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
U0428:00
U0428:64
U0428:68
Combined sensor system
C0061:01
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
C0061:28
C0061:64
C0063:01
C0063:28
C0063:64
C006A:04
C006A:16
C006A:17
C006A:47
C1108:01
TCS/DSC control system
C006B:00
DSC OFF switch
C1109:64
Not illuminated
Not illuminated
Not illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control enabled
Control enabled
CAN line
U0001:88
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
U0100:00
U0126:00
U0155:00
Illuminated
Control disabled
Control enabled
U2101:00
Combined sensor system (CAN2 line malfunction)
U0125:00
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
U0125:88
Abnormal message from PCM
U0401:68
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
Configuration data not recorded
U2100:00
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
DSC HU/CM (internal malfunction)
U3000:47
Illuminated
Illuminated
illuminated
Not illuminated
Control disabled
Control disabled
Control disabled
Control disabled
U3000:48
U3000:49
Combined sensor system (unperformed initialization procedure)
U3000:54
Not illuminated
Not illuminated
illuminated
Not illuminated
Control enabled
Control enabled
Control enabled
Control disabled
Control disabled
Power supply system
U3003:16
Illuminated
Not illuminated*3
illuminated
Not illuminated
Control disabled
Control enabled*3
Control disabled
Control disabled
Illuminated*4
Control disabled*4
U3003:17
Illuminated
Illuminated
Control disabled
Control disabled

*1  :Illuminates when two wheels or more have a malfunction.
*2  :Control disabled when two wheels or more have a malfunction.
*3  :Detected if condition of 9.4—10.0 V or less continues for 210 ms or more.
*4  :Detected if condition of 7.55—8.45 V or less continues for 30 s or more.