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

BHE060201038T05

## 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
--- | ---
WDS
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 WDS or equivalent to the DLC-2, diagnostic data can be sent and received between the WDS or equivalent 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 WDS or equivalent, and sends DTCs and data regarding the operating condition and status of each input/output part to the WDS or equivalent.

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