ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION [ELECTRIC POWER STEERING (EPS)]

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Outline

•  The external tester communication function enables communication of diagnostic data (DTC read-outs, input/output signal read-outs) between the EPS control module 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: CAN_H (HS), CAN_L (HS)
Serial communication
PID/DATA monitor function
Input/output: CAN_H (HS), CAN_L (HS)
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 EPS control module via the CAN line.
•  The EPS control module receives the command signals of the malfunction detection function, PID/data monitor function from 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).
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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