CONTROL SYSTEM
09–40–5
09–40
On-Board Diagnostic Function
• The on-board diagnostic function is incorporated into the PCM, TCM, ABS HU/CM (or DSC HU/CM), keyless
control module, EPS control module, TPMS control module and instrument cluster. This function can narrow
down CAN system malfunction locations.
• The on-board diagnostic function consists of the following functions.
— Failure detection function, which detects malfunctions in CAN system-related parts.
— Memory function, which stores detected DTCs.
— Self-malfunction diagnostic function, which indicates system malfunctions using DTCs and warning lights.
— PID/data monitoring function, which verifies the input/output condition of specific input/output signals being
read out.
• Using an SST (WDS or equivalent), DTCs can be read out and deleted, and the PID/data monitoring function
can be activated.
• The CAN system has a fail-safe function. When a malfunction occurs in CAN system, the transmission module
sends a warning signal and the receiving module illuminates the warning light.
Brake
system
status
ABS/
EBD
IN IN IN
OUT
–––IN
EBD/
ABS/
DSC
OUT
Torque down request IN – OUT
–
––– –
OUT
Wheel speed (LF, RF,
LR, RR)
IN ––OUT ––– –
Wheel speed status
(LF, RF, LR, RR)
IN ––OUT ––– –
Steering angle –– –
–
––OUT –
IN
Steering angle sensor
status (sensor
malfunction, circuit
malfunction)
–– –
–
––OUT –
IN
Fuel tank level IN ––––––OUT
Parking brake position –– –
–
–––OUT
IN
AT warning light on
request
––OUT ––––IN
Tire pressure warning
light on request
–– – – –OUT – IN
Tire pressure warning
buzzer on request
–– – – –OUT – IN
Signal
Multiplex module
PCM
EPS
control
module
TCM (AT)
ABS HU/
CM
Keyless
control
module
TPMS
control
module
Steering
angle
sensor
Instrument
cluster
DSC HU/
CM
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