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ON-BOARD DIAGNOSTIC [DYNAMIC STABILITY CONTROL (DSC)]
04-02–2
Block diagram
End Of Sie
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 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.
ON-BOARD DIAGNOSTIC FUNCTION
MALFUNCTION
DISPLAY FUNCTION
SERIAL
COMMUNICATION
MEMORY
FUNCTION
MALFUNCTION
DETECTION
FUNCTION PID/DATA
MONITOR
FUNCTION
ACTIVE COMMAND
MODES FUNCTION
INPUT
DEVICE
NORMAL CONTROL AREA
OUTPUT
DEVICE
FAIL-SAFE
FUNCTION
HU INSPECTION
FUNCTION
MAZDA MODULAR
DIAGNOSTIC
SYSTEM (M-MDS)
DLC-2
DSC
INDICATOR
LIGHT
DSC OFF
LIGHT
ABS
WARNING
LIGHT
BRAKE
SYSTEM
WARNING
LIGHT
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