Mazda RX-8 2004 Service Highlights page 347

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