ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION

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• The external tester communication function enables communication of diagnostic data (DTC read-outs, input/output signal read-outs, and operation of input/output parts) between the 4-wheel drive (4WD) control module (CM) and an external tester.

Connections and Communication Contents

| External tester
--- | ---
Mazda Modular Diagnostic System (M-MDS)
Connection | Communication method
On-board diagnostic (malfunction detection) function | Input/output: HS_CAN_H, HS_CAN_L | Serial communication
PID/DATA monitor function | Input/output: HS_CAN_H, HS_CAN_L | Serial communication
Active command modes function | Input/output: HS_CAN_H, HS_CAN_L | 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 M-MDS and the 4WD CM using the HS_CAN_H and HS_CAN_L terminals (within the DLC-2).
• The 4WD CM receives the command signals of the malfunction detection function, parameter identification (PID)/data monitor function, and the active command modes function from the M-MDS, and sends DTCs and data regarding the operating condition and status of each input/output part to the M-MDS.

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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 | Input/output part name