ON-BOARD DIAGNOSTIC SYSTEM FUNCTION (ABS, DYNAMIC STABILITY CONTROL)
id040200100200
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.
Fail-safe Function Malfunction Contents (Vehicles With ABS)
|
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)
|
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
|
|
Incorrect ABS HU/CM installed
|
C1805
|
Illuminated
|
Illuminated
|
Control disabled
|
Control enabled
|
|
CAN communication system
|
U0073
|
Not illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
|
U1900
|
|
U2023
|
-
*1 :
If the ignition voltage returns to normal, the light goes out.
-
*2 :
If the ignition voltage returns to normal, control is enabled.
Fail-safe Function Malfunction Contents (Vehicles With DSC)
|
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
|
|
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 disabled
|
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
|
|
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
|
|
U0155
|
|
U1900
|
|
U2023
|
-
*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.