ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION [DYNAMIC STABILITY CONTROL (DSC)]

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• The external tester communication function enables communication of diagnostic data (DTC read-outs, input/output signal read-outs, operation of input/output parts) between the DSC HU/CM and an external tester.

Connections/Communication Contents

| External tester
--- | ---
Mazda Modular Diagnostic System (M-MDS)
Connection | Communication method
On-board diagnostic (malfunction detection) function | Input/output: CAN_H (HS), CAN_L (HS) terminals | Serial communication
PID/data monitor function | Input/output: CAN_H (HS), CAN_L (HS) terminals | Serial communication
active command modes function | Input/output: CAN_H (HS), CAN_L (HS) terminals | Serial communication

Serial communication

• Serial communication (two-way communication) allows for multiple data to be sent and received instantly along the same line.
• By connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2, diagnostic data can be sent and received between the Mazda Modular Diagnostic System (M-MDS) and the DSC HU/CM using the CAN_H and CAN_L terminals (within the DLC-2).
• The DSC HU/CM receives the command signals of the malfunction detection function, PID/data monitor function, and the active command modes function based on the Mazda Modular Diagnostic System (M-MDS), and sends DTCs and data regarding the operating condition and status of each input/output part to the Mazda Modular Diagnostic System (M-MDS).

Diagnostic function name | Signal received | Signal sent
--- | --- | ---
Malfunction detection function | DTC verification signal | DTC
PID/data monitor function | Command signal to read selected monitor item | Monitored data for requested monitor item
active command modes function | Operation command signal for selected active command modes item | Output part drive signal

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