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 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, DSC and brake assist control 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
	DTC number	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 assist control
	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	Brake control	Engine control	DSC control	Brake assist control
Power supply system	B1317	Illuminated	Illuminated	Illuminated	Not illuminated	Control disabled	Control disabled	Control disabled	Control disabled	Control disabled	Control disabled
Power supply system	B1318	Illuminated ^*1	Not illuminated ^*2	Illuminated ^*1	Not illuminated	Control disabled ^*3	Control enabled ^*4	Control disabled ^*3	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	Control disabled
Brake switch system	B1484	Illuminated ^*5	Illuminated^*19	Illuminated	Not illuminated	Control disabled ^*6	Control enabled ^*7	Control disabled ^*6	Control disabled ^*6	Control disabled	Control disabled
Brake switch system	C1954	Illuminated ^*5	Illuminated^*19	Illuminated	Not illuminated	Control disabled ^*6	Control enabled ^*7	Control disabled ^*6	Control disabled ^*6	Control disabled	Control disabled
DSC HU/CM configuration	B2477	Illuminated ^*8	Not illuminated	Illuminated ^*8	Not illuminated	Control disabled	Control enabled ^*7	Control disabled	Control disabled	Control disabled	Control disabled
Combined sensor system	B2741	Not illuminated	Not illuminated	Illuminated	Not illuminated	Control enabled ^*7	Control enabled	Control disabled ^*9	Control disabled ^*9	Control disabled	Control enabled ^*7
	C2768
	U2516
DSC OFF switch system	C1093	Not illuminated	Not illuminated	Illuminated	Illuminated	Control enabled	Control enabled	Control disabled	Control disabled	Control disabled	Control enabled
Pump motor, motor relay systems	C1095	Illuminated	Illuminated	Illuminated	Not illuminated	Control disabled	Control enabled ^*7	Control disabled	Control disabled	Control disabled	Control disabled
Pump motor, motor relay systems	C1096	Illuminated	Illuminated	Illuminated	Not illuminated	Control disabled	Control enabled ^*7	Control disabled	Control disabled	Control disabled	Control disabled
LF ABS sensor rotor	C1141	Illuminated	Not illuminated	Illuminated	Not illuminated	Control disabled ^*10	Control enabled ^*7	Control disabled	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 ^*10	Control enabled ^*7	Control disabled	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 ^*10	Control enabled ^*7	Control disabled	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	Control disabled
Valve relay system	C1266	Illuminated	Not illuminated	Illuminated	Not illuminated	Control disabled	Control enabled ^*7	Control disabled	Control disabled	Control disabled	Control disabled
LF outlet solenoid valve system	C1194	Illuminated	Illuminated	Illuminated	Not illuminated	Control disabled	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	Illuminated	Illuminated	Illuminated	Not illuminated	Control disabled	Control disabled	Control disabled	Control disabled	Control disabled	Control disabled
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 ^*11	Illuminated	Not illuminated	Control disabled ^*12	Control disabled ^*13	Control disabled	Control disabled	Control disabled	Control disabled
LF ABS wheel-speed sensor system	C1233	Illuminated	Not illuminated	Illuminated	Not illuminated	Control disabled ^*10	Control enabled ^*7	Control disabled	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 ^*7	Control enabled	Control disabled ^*9	Control disabled ^*9	Control disabled	Control enabled ^*7
	C1280			Illuminated ^*14				Control disabled ^{*9, 15}	Control disabled ^{*9, 15}	Control disabled ^*15
	C1281			Illuminated				Control disabled ^*9	Control disabled ^*9	Control disabled
	C1952			Illuminated ^*16				Control disabled ^{*9, 17}	Control disabled ^{*9, 17}
	C1959			Illuminated				Control disabled ^*9	Control disabled ^*9
Brake fluid pressure sensor system	C1290	Illuminated ^*18	Not illuminated	Illuminated	Not illuminated	Control disabled ^*10	Control enabled ^*7	Control disabled ^*9	Control disabled ^*9	Control disabled	Control disabled
Brake fluid pressure sensor system	C1953	Illuminated ^*18	Not illuminated	Illuminated	Not illuminated	Control disabled ^*10	Control enabled ^*7	Control disabled ^*9	Control disabled ^*9	Control disabled	Control disabled
Steering angle sensor system	C1295	Not illuminated	Not illuminated	Illuminated	Not illuminated	Control enabled ^*7	Control enabled	Control disabled ^*9	Control disabled ^*9	Control disabled	Control enabled ^*7
	C1307
	C1937
	C1938			Illuminated ^*14				Control disabled ^{*9, 15}	Control disabled ^{*9, 15}	Control disabled ^*15
	C1956			Illuminated				Control disabled ^*9	Control disabled ^*9	Control disabled
Steering angle sensor (abnormal initialization) system	C1306	Not illuminated	Not illuminated	Illuminated	Flash	Control enabled ^*7	Control enabled	Control disabled ^*9	Control disabled ^*9	Control disabled	Control enabled ^*7
DSC control system	C1994	Illuminated	Not illuminated	Illuminated	Not illuminated	Control disabled	Control enabled^*7	Control disabled	Control disabled	Control disabled	Control disabled
CAN communication system	U0073	Not illuminated	Not illuminated	Illuminated	Not illuminated	Control enabled ^*7	Control enabled	Control disabled	Control disabled	Control disabled	Control enabled ^*7
	U0100
	U0101
	U0155
	U1900
Abnormal message from PCM	U2023
CAN2 communication system	U0074	Not illuminated	Not illuminated	Illuminated	Not illuminated	Control enabled ^*7	Control enabled	Control disabled	Control disabled	Control disabled	Control enabled ^*7
	U0123							Control disabled ^*9	Control disabled ^*9
	U1901							Control disabled	Control disabled

*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 :Control which requires sensor data is inhibited.

*8 :If the configuration data is not within the specification, the light flashes.

*9 :If an error is detected during the TCS control, the control is disabled after finishing the control.

*10 :If an error is detected during the ABS control, the control is disabled after finishing the control.

*11 :If an abnormal cornering direction is detected, the light does not illuminate.

*12 :If an abnormal cornering direction is detected during the ABS control, the control is disabled after finishing the control.

*13 :If an abnormal cornering direction is detected, the control is not disabled.

*14 :When an abnormal cornering direction is detected, the light turns off if the normal condition is verified the next time the system is activated.

*15 :When an abnormal cornering direction is detected, control is enabled if the normal condition is verified the next time the system is activated.

*16 :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 LOCK position.

*17 :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 LOCK position.

*18 :If an error is detected during the ABS control, the light illuminates after finishing the control.

*19 :Vehicles without malfunction warning light. (Applied VIN (assumed): NC18**215550—, NC18**250831—, NC30**202488—, NCA8**251024—)