Mazda RX-8 2004 - Control; Memory Function; Fail-Safe Function

ON-BOARD DIAGNOSTIC
04–02–3
04–02
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
WDS or
equivalent
display
ABS warning light
Brake system
warning light (when
parking brake is
released)
ABS control EBD control
Power supply system B1318
Illuminated
*1
Illuminated
*1
Control enabled Control enabled
ABS HU/CM system B1342 Illuminated Illuminated Control disabled Control disabled
ABS wheel-speed
sensor system
C1145
Illuminated
Not illuminated
*2
Control disabled
Control
enabled
*3
C1148
C1155
C1158
C1165
C1168
C1175
C1178
ABS wheel-speed
sensor/ABS sensor
rotor systems
C1233
Illuminated
Not illuminated
*4
Control disabled
Control
enabled
*5
C1234
C1235
C1236
Solenoid valve
system
C1194
Illuminated
Illuminated
*6
Control disabled
Control
disabled
*7
C1198
C1210
C1214
C1242
C1246
C1250
C1254
ABS HU/CM internal
pump system
C1140 Illuminated Not illuminated Control disabled Control enabled
Solenoid valve, pump
motor, ABS wheel
speed sensor/ABS
sensor rotor systems
C1510
Illuminated
Not illuminated
*2
Control disabled
Control
enabled
*3
C1511
C1512
C1513
Fail-safe relay
system
C1186
Illuminated
Illuminated
Control disabled
Control disabled
C1266 Not illuminated Control enabled