Page 1225 of 4500
Fig. 26: DTC Outputs Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
ocirc: Outputs
Delta: Outputs under the following condition
Page 1226 of 4500
x: Not output
-: Undetectable
HINT:
see SKID CONTROL ECU COMMUNICATION STOP MODE .
see STEERING SENSOR COMMUNICATION STOP MODE .
see YAW RATE SENSOR COMMUNICATION STOP MODE .
see GATEWAY ECU COMMUNICATION STOP MODE .
see ECM COMMUNICATION STOP MODE .
see DISTANCE CONTROL ECU COMMUNICATION STOP MODE .
see SUSPENSION CONTROL ECU COMMUNICATION STOP MODE .
see TELEVISION CAMERA ECU COMMUNICATION STOP MODE .
see SEAT BELT CONTROL ECU COMMUNICATION STOP MODE .
Page 1227 of 4500
Fig. 27: Display OBD/MOBD Menu Screen
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.BUS CHECK
HINT:
The ECUs and sensors that are properly connected to the CAN communication system can be displayed
using the hand-held tester via CAN VIM.
a. Select "BUS CHECK" from the "OBD/MOBD MENU" screen.
Page 1228 of 4500
Fig. 28: Display ENTER Button
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Press "ENTER" on the hand-held tester via CAN VIM.
Page 1229 of 4500
Fig. 29: [Displays ECUs And Sensors]
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. The screen displays the ECUs and sensors that are properly connected to the CAN communication
system.
HINT:
There is a communication stop in the system of any properly connected ECUs or sensors that are
not displayed (see CHECK CAN BUS LINE
).
2.CHECK FOR INSTALLED SYSTEMS (ECUS & SENSORS) THAT ADOPT CAN
COMMUNICATION
a. Systems (ECUs, sensors) that adopt CAN communication vary depending on the vehicle's optional
settin
gs. Check which systems (ECUs, sensors) are installed on the vehicle.
Page 1230 of 4500
Fig. 30: ECUS And Sensors Checking Method Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.FAIL-SAFE FUNCTION
a. When communication fails in any of the CAN bus lines (communication lines) due to a short circuit
or other causes, the fail-safe function, which is specified for each system, operates to prevent the
system from malfunctioning.
b. Effects on each system when communication is impossible. (For further details, see the pages for
each system.)
FAIL-SAFE CHART
FunctionECM
Skid
Control
ECUSteering
SensorYaw
Rate
SensorDistance
Control
ECUTelevision
Camera
ECUSuspension
Control
ECUGateway
ECU
Seat
Belt
Control
ECUAction
unab
l
commu
VSC
Control
(Controls
driving force
while VSC
is in
operation)
RxTxRx VSC fun
stop
VSC
Control
(Controls
driving force
while VSC
is in
operation)
RxRx VSC fun
stop
Page 1231 of 4500
Dynamic
Radar/Laser
Cruise
(Maintains
vehicle-to-
vehicle
distance)
Tx
RxTx Rx Tx Rx
Vehicl
Vehi
dista
n
control
not op
e
Back
Monitor
(Exterior
view from
rear of
vehicle is
displayed
while
reversing)
Tx Rx Back m
onl
Air
Suspension
Control
(Controls
suspension
properly
based on
vehicle
conditions)
TxTx Rx Control
Meter
Display
(Displays
operation
condition
and DTCs)
TxTx RxTx
Lamp
not co
m
or remai
Pre -
collision
Safety (Skid
control ECU
brings BA in
standby
mode and
seat belt is
fastened by
seat belt
control ECU
when
distance
control ECU
determines
that collision
Rx Tx RxPre-col
l
safety sy
does
oper
a
Page 1232 of 4500

HINT:
Rx: Reception from each ECU (sensor).
Tx: Transmission to each ECU (sensor).
1.DTC TABLE BY ECU
HINT:
If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs.
Perform troubleshooting according to "HOW TO PROCEED WITH TROUBLESHOOTING" (see
HOW TO PROCEED WITH TROUBLESHOOTING
).
a. ECM
HINT:
DTC communication uses the CAN communication system.
Distance control ECU data is also output.
ECM DIAGNOSTIC TROUBLE CODE CHART
*1: The engine control computer is malfunctioning if U0001 is output. Replace the ECM.
*2: Dynamic radar/laser cruise DTC.
b. SKID CONTROL ECU
HINT:
DTC communication uses the SIL line.
SKID CONTROL ECU DIAGNOSTIC TROUBLE CODE CHART
is
unavoidable)
DTC No.Detection Item
U0001High Speed CAN Communication Bus (*1)
U0100Lost Communication With ECM/PCM "A" (*2)
U0122Lost Communication With Vehicle Dynamics Control Module (*2)
U0123Lost Communication With Yaw Rate Sensor Module (*2)
U0126Lost Communication With Steering Angle Sensor Module (*2)
U1101Lost Communication With Distance Control ECU (*2)
DTC No.Detection Item
U0073Control Module Communication Bus Off