ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION (TIRE PRESSURE MONITORING SYSTEM)

id020200100600

External Tester Communication Function

• The external tester communication function communicates diagnostic information (reading DTCs and reading input/output signal) by sending and receiving signals between the instrument cluster and an external tester.

Connection and communication information

| External tester
--- | ---
Mazda Modular Diagnostic System (M-MDS)
Connection | Communication method
On-board diagnostic (malfunction detection) function | Input/output: CAN communication line | Serial communication
PID/Data monitor function | Input/output: CAN communication line | Serial communication
Active command modes function | Input/output: CAN communication line | Serial communication

Serial Communication

• Serial communication (synchronous communication) is a method of communication in which many pieces of information are sent and received instantaneously through a single wire.
• By connecting the Mazda Modular Diagnostic System (M-MDS) to DLC-2, diagnostic information can be sent and received between the Mazda Modular Diagnostic System (M-MDS) and the instrument cluster via the CAN communication line.
• The instrument cluster receives signals for the malfunction detection function and data monitor function from the Mazda Modular Diagnostic System (M-MDS), and sends information about DTCs and input/output part operating conditions to the Mazda Modular Diagnostic System (M-MDS).

Diagnostic function | Signal received | Signal sent
--- | --- | ---
Malfunction detection function | DTC verification signal | DTC
PID/Data monitor function | Request signal to read selected monitor item | Monitor information for requested monitor item
Active command modes function | Operation command signal for selected active command modes item | Wheel unit ID registration