Diagnosis System

BUS CHECK
1. Select "BUS CHECK" from the "OBD/MOBD MENU" screen.
  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.
  
  Fig 1: Hand-Held Tester Screen Display - Bus Check
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press "ENTER" on the hand-held tester via CAN VIM.
  
  Fig 2: Hand-Held Tester Screen Display - Press "Enter"
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 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.
  
  Fig 3: Hand-Held Tester Screen Display - BUS Check
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK FOR INSTALLED SYSTEMS (ECUS & SENSORS) THAT ADOPT CAN COMMUNICATION

Systems (ECUs, sensors) that adopt CAN communication vary depending on the vehicle's optional settings. Check which systems (ECUs, sensors) are installed on the vehicle.

DIAGNOSTIC PROCEDURE

ECU/Sensors name	Check method
Skid control ECU with actuator	Engine model 3GR-FSE
Skid control ECU	Engine model 3UZ-FE
Steering sensor	Installed on all vehicles
Yaw rate sensor	Installed on all vehicles
ECM	Installed on all vehicles
Distance control ECU	Dynamic laser cruise control
Absorber control ECU	Installed on all vehicles
Network gateway ECU	Installed on all vehicles
Television camera ECU	LEXUS parking assist (rear view monitor or back guide monitor)
Clearance warning ECU	LEXUS parking assist (clearance sensor)
Seat belt control ECU	Dynamic laser cruse control
Power steering ECU	Installed on all vehicles
Steering control ECU	Engine model 3UZ-FE
4WD ECU	4 wheel drive

DTC TABLE BY ECU

HINT:

In the CAN communication system, CAN communication system DTCs can be displayed by the ECU using the intelligent tester

If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs. Perform troubleshooting according to HOW TO PROCEED WITH TROUBLESHOOTING . (If, however, U0235 or U1101/U01102 is output alone, see the dynamic laser cruise control system.)

ECM

HINT:

DTC communication uses the CAN communication system.

Distance control ECU data is also output.

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0001	High speed CAN Communication Bus
U0100	Lost Communication With ECM/PCM "A"
U0122	Lost Communication With Vehicle Dynamics Control Module
U0123	Lost Communication With Yaw Rate sensor Module
U0126	Lost Communication With Steering Angle Sensor Module
U0235	Lost Communication With Cruise Control Front Distance Range Sensor
U1101	Lost Communication With Distance Control ECU
U1102	Lost Communication With Distance Control ECU

*1: The ECM is malfunctioning if U0001 is output alone. Replace the ECM.
*2: Displayed on the "communication malfunction DTCs "screen of the intelligent tester. If U0235 or U1102 is output alone, the CAN communication is normal (see DTC U0235 LOST COMMUNICATION WITH CRUISE CONTROL FRONT DISTANCE RANGE SENSOR for U0235, DTC U1102 LOST COMMUNICATION WITH RADAR SENSOR for U1102).
*3: Dynamic laser cruise DTC.

SKID CONTROL ECU

HINT:

DTC communication uses the SIL line.

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0073	Control Module communication Bus Off
U0100	Lost Communication With ECM/PCM "A"
U0123	Lost Communication With Yaw Rate sensor Module
U0124	Lost Communication With Lateral Acceleration Sensor Module
U0126	Lost Communication With Steering Angle Sensor Module

ABSORBER CONTROL ECU

HINT:

DTC communication uses the SIL line.

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0100	Lost Communication With ECM/PCM "A"
U0101	Lost Communication With ECM
U0122	Lost Communication With Vehicle Dynamics Control Module
U0124	Lost Communication With Lateral Acceleration Sensor Module
U0126	Lost Communication With Steering Angle Sensor Module
U0132	Lost Communication With Ride Level control Module

POWER STEERING ECU

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0073	Control Module Communication Bus Off
U0100	Lost Communication With ECM/PCM "A"
U0123	Lost Communication With Yaw Rate Sensor Module
U0124	Lost Communication With Lateral Acceleration Sensor Module
U0126	Lost Communication With Steering Angle Sensor Module

SEAT BELT CONTROL ECU

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0100	Lost Communication With ECM/PCM "A"
U0122	Lost Communication With Vehicle Dynamics Control Module
U0145	Lost Communication With Gateway ECU
U1101	Lost Communication With Distance Control ECU

DISTANCE CONTROL ECU

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0100	Lost Communication With ECM/PCM "A"
U0122	Lost Communication With Vehicle Dynamics Control Module
U0123	Lost Communication With Yaw Rate Sensor Module
U0131	Lost Communication With Power Steering ECU
U0132	Lost Communication With Absorber Control ECU
U0146	Lost Communication With Gateway ECU
U1101	Lost Communication With Distance Control ECU

STEERING CONTROL ECU

DTC DETECTION ITEM CHART

DTC No.	Detection Item
U0100	Lost Communication With ECM/PCM "A"
U0122	Lost Communication With Vehicle Dynamics Control Module
U0126	Lost Communication With Steering Angle Sensor Module
U0131	Lost Communication With Power Steering ECU

NETWORK GATEWAY ECU
HINT:

The network gateway ECU is connected to the CAN communication system but CAN communication DTCs are not output.

Fig 5: DTC Combination Table (2 Of 4)

Fig 6: DTC Combination Table (3 Of 4)

Fig 7: DTC Combination Table (4 Of 4)

HINT: