ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION

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Outline

•  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 EPS control module and an external tester.

Connections/Communication Contents

External tester

Mazda modular diagnostic system (M-MDS)

Connection

Communication method
Self-diagnosis (malfunction detection) function
Input/output: CAN_H, CAN_L
Serial communication
PID/data monitor function
Input/output: CAN_H, CAN_L
Serial communication
Active command modes function
Input/output: CAN_H, 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 Mazda modular diagnostic system (M-MDS) and the EPS control module via CAN communication lines.
•  The EPS control module receives the command signals of the malfunction detection function, PID/data monitor function, and the active command modes 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 selected monitor item
Active command modes function
Operation command signal for selected active command item
Output part operation signal and system neutral position setting