On-Board Diagnostic [Dynamic Stability Control (Dsc)]; Dsc; Malfunction Detection Function; Memory Function - Mazda RX-8 2009 Service Highlights

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

Block diagram

DSC

INDICATOR
LIGHT
ON-BOARD DIAGNOSTIC FUNCTION
INPUT
DEVICE
End Of Sie
ON-BOARD DIAGNOSTIC SYSTEM FUNCTION [DYNAMIC STABILITY CONTROL (DSC)]

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.
04-02–2
DSC OFF
LIGHT
MALFUNCTION
DISPLAY FUNCTION
MEMORY
FUNCTION
SERIAL
COMMUNICATION
PID/DATA
MALFUNCTION
DETECTION MONITOR
FUNCTION FUNCTION
FAIL-SAFE
FUNCTION
NORMAL CONTROL AREA
BRAKE
ABS
SYSTEM
WARNING
WARNING
LIGHT
LIGHT
ACTIVE COMMAND
MODES FUNCTION
HU INSPECTION
FUNCTION
DLC-2
MAZDA MODULAR
DIAGNOSTIC
SYSTEM (M-MDS)
OUTPUT
DEVICE
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id0402b2175100