ON-BOARD DIAGNOSTIC
06–02–4
ON-BOARD DIAGNOSTIC SYSTEM EXTERNAL TESTER COMMUNICATION FUNCTION (ELECTRIC POWER
STEERING)
CHU060201038S05
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
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 mode 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.
End Of Sie
Item
External tester
WDS
Connection Communication method
Self-diagnosis (malfunction
detection) function
Input/output: CAN_H, CAN_L Serial communication
PID/data monitor function
Active command mode function
DLC-2
CHU0602S001
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 mode function
Operation command signal for selected
active command item
Output part operation signal and system
neutral position setting
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