Mazda RX-8 2004 Service Highlights page 344

06–02 ON-BOARD DIAGNOSTIC
ON-BOARD DIAGNOSTIC SYSTEM
OUTLINE (ELECTRIC POWER
STEERING) . . . . . . . . . . . . . . . . . . . . . . 06–02–1
Block Diagram . . . . . . . . . . . . . . . . . . . 06–02–1
ON-BOARD DIAGNOSTIC SYSTEM
FUNCTION (ELECTRIC POWER
STEERING) . . . . . . . . . . . . . . . . . . . . . . 06–02–2
Malfunction Detection Function . . . . . . 06–02–2
Malfunction Display Function . . . . . . . . 06–02–2
Memory Function . . . . . . . . . . . . . . . . . 06–02–2
Fail-safe Function . . . . . . . . . . . . . . . . 06–02–2
ON-BOARD DIAGNOSTIC SYSTEM
End of Toc
ON-BOARD DIAGNOSTIC SYSTEM OUTLINE (ELECTRIC POWER STEERING)
• The on-board diagnostic system consists of a malfunction detection system that detects abnormalities in input/
output signals when the ignition switch is at the ON position, a data monitor function that reads out specified
input/output signals and a simulation function that allows for override operation of output parts and is used to
set the system to the neutral position.
• The Data Link Connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis
into a single location, has been adopted, thereby improving serviceability. Diagnosis is performed by
connecting the WDS or equivalent to the DLC-2.
• In addition to DTC read-out, the WDS or equivalent is used to clear DTCs using the display screen of the
diagnostic tester, and to access the data monitor and simulation functions, providing enhanced malfunction
diagnosis and improved serviceability.
Block Diagram
INPUT
PARTS
End Of Sie
ON-BOARD DIAGNOSTIC
EPS CONTROL MODULE
ON-BOARD DIAGNOSTIC
FUNCTION
MEMORY
FUNCTION
MALFUNCTION
INDICATION
FUNCTION
MALFUNCTION DATA
DETECTION MONITOR
FUNCTION
FUNCTION
FAIL-SAFE
FUNCTION
EPS NORMAL CONTROL AREA
PID/DATA MONITOR FUNCTION
(ELECTRIC POWER STEERING) . . . . . 06–02–3
ON-BOARD DIAGNOSTIC SYSTEM
ACTIVE COMMAND MODE FUNCTION
(ELECTRIC POWER STEERING) . . . . . 06–02–3
ON-BOARD DIAGNOSTIC SYSTEM
EXTERNAL TESTER
COMMUNICATION FUNCTION
(ELECTRIC POWER STEERING) . . . . . 06–02–4
Outline . . . . . . . . . . . . . . . . . . . . . . . . . . 06–02–4
DLC-2 CONSTRUCTION . . . . . . . . . . . . . 06–02–5
EXTERNAL
TESTER
CAN
COMMUNICATION
DRIVER
FUNCTION
ACTIVE
COMMAND
FUNCTION
CHU060201038S01
06–02
EPS WARNING
LIGHT
DLC-2
OTHER UNIT
(PCM)
OUTPUT
PARTS
CHU0602S003
06–02–1