Diagnosis System

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 intelligent tester via CAN VIM.

   Fig 1: Intelligent Tester Display - BUS CHECK

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press "ENTER" on the intelligent tester.
   Fig 2: Intelligent Tester Display - 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: Intelligent Tester Display - BUS CHECK

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. 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.
   ECU/SENSOR NAME AND CHECKING METHOD REFERENCE
   
   

   ECU/Sensor name	Check method
   Skid control ECU	Installed on all vehicles
   Steering angle sensor	Installed on all vehicles
   Yaw rate sensor	Installed on all vehicles
   ECM	Installed on all vehicles
   Center airbag sensor	Installed on all vehicles
   Air conditioning amplifier	Installed on all vehicles
   Combination meter	Installed on all vehicles
   Main body ECU	Installed on all vehicles
   Active control engine mount ECU	Installed on all vehicles
   Certification ECU	Installed on all vehicles
   Multi-display	Installed on vehicles with navigation system
   Gateway ECU	Installed on vehicles with any of AFS, dynamic radar cruise control system, and pre-collision system
   Outer mirror control ECU	Installed on all vehicles
   Multiplex tilt and telescopic ECU	Installed on all vehicles
   Clearance warning ECU	Installed on vehicles with intuitive parking assist system
   Seat position control ECU (Front LH side)	Installed on vehicles with seat position memory system
   Seat position control ECU (Front RH side)	Installed on vehicles with seat position memory system
   AFS ECU	Installed on vehicles with AFS (Adaptive Front-lighting System)
   Distance control ECU	Installed on vehicles with dynamic radar cruise control system
   Seat belt control ECU	Installed on vehicles with pre-collision system

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 ".

1. ECM

   HINT:

   • DTC communication uses the CAN communication system.
   • Distance control ECU data is also output.
     DTC TABLE (ECM)
     
     

     DTC No.	Detection Item
     U0100 ((3))	Lost Communication with ECM/PCM "A"
     U0101 ((1))	Lost Communication with Communication with TCM
     U0122 ((3))	Lost Communication with Vehicle Dynamics Control Module
     U0123 ((3))	Lost Communication with Yaw Rate Sensor Module
     U0126 ((3))	Lost Communication with Steering Angle Sensor Module
     U0235 ((2), (3))	Lost Communication with Cruise Control Front Distance Range Sensor
     U1101 ((3))	Lost Communication with Distance Control ECU
     U1102 ((2))	Lost Communication with Radar Sensor
     (1) If only DTC U0101 is output, refer to SFI system (See DTC U0101 LOST COMMUNICATION WITH TCM ). (2) If U0235 or U1102 is output alone from the ECUs, the CAN communication is normal (See DTC U0235 LOST COMMUNICATION WITH CRUISE CONTROL FRONT DISTANCE RANGE SENSOR for U0235, See DTC U1102 LOST COMMUNICATION WITH RADAR SENSOR for U1102). (3) This DTC is output only for vehicles with the dynamic radar cruise control system.

2. SKID CONTROL ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (SKID CONTROL ECU)
   
   

   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

3. COMBINATION METER

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (COMBINATION METER)
   
   

   DTC No.	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0129	Lost Communication with Skid Control ECU

4. GATEWAY ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (GATEWAY ECU)
   
   

   DTC No.	Detection Item
   U0182	Lost Communication with AFS ECU
   U1002	Lost Communication with Gateway Module
   U1100	Lost Communication with Seat Belt Control ECU
   U1102	Lost Communication with Radar Sensor

5. MAIN BODY ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (MAIN BODY ECU)
   
   

   DTC No.	Detection Item
   B1207	Certification ECU Communication Malfunction
   B1213	Tilt and Telescopic ECU Communication Stop
   B1272	Power Seat ECU Communication Stop
   B1276	Power Mirror Control ECU Communication Stop
   B1289	Passenger Seat ECU Communication Stop
   B1297	Clearance Sonar ECU Communication Stop
   B2326	CAN MS Bus Line Communication Malfunction

6. AFS ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (AFS ECU)
   
   

   DTC No.	Detection Item
   B2427	CAN Communication Malfunction

7. SEAT BELT CONTROL ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (SEAT BELT CONTROL ECU)
   
   

   DTC No.	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0122	Lost Communication with Vehicle Dynamics Control Module
   U0151	Lost Communication with Airbag ECU
   U0235 (*4)	Lost Communication with Cruise Control Front Distance Range Sensor
   U1101	Lost Communication with Distance Control ECU
   U1102 (*4)	Lost Communication with Radar Sensor
   HINT: *4 : If U0235 or U1102 is output alone from the ECUs, the CAN communication is normal (See DTC U0235 LOST COMMUNICATION WITH CRUISE CONTROL FRONT DISTANCE RANGE SENSOR for U0235, See DTC U0235 LOST COMMUNICATION WITH CRUISE CONTROL FRONT DISTANCE RANGE SENSOR for U1102).

8. MULTIPLEX TILT AND TELESCOPIC ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC TABLE (MULTIPLEX TILT AND TELESCOPIC ECU)
   
   

   DTC No.	Detection Item
   B2621	Communication interruption

9. CENTER AIRBAG SENSOR

   HINT:

   The center airbag sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

10. STEERING ANGLE SENSOR

    HINT:

    The steering angle sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

11. YAW RATE SENSOR

    HINT:

    The yaw rate sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

12. OUTER MIRROR CONTROL ECU

    HINT:

    The outer mirror control ECU sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

13. CERTIFICATION ECU

    HINT:

    The certification ECU is connected to the CAN communication system, but CAN communication DTCs are not output.

14. MULTI-DISPLAY

    HINT:

    The multi-display is connected to the CAN communication system, but CAN communication DTCs are not output.

15. CLEARANCE WARNING ECU

    HINT:

    The clearance warning ECU is connected to the CAN communication system, but CAN communication DTCs are not output.

16. SEAT POSITION CONTROL ECU (FRONT LH SIDE)

    HINT:

    The seat position control ECU (front LH side) is connected to the CAN communication system, but CAN communication DTCs are not output.

17. SEAT POSITION CONTROL ECU (FRONT RH SIDE)

    HINT:

    The seat position control ECU (front RH side) is connected to the CAN communication system, but CAN communication DTCs are not output.

1. CAN No. 1 Bus
   DTC COMBINATION TABLE (CAN NO 1 BUS)
   
   

   DTC		Trouble Mode
   Output from	Output DTC	ECM Communication Stop Mode	Skid Control ECU Communication Stop Mode	Steering Angle Sensor Communication Stop Mode	Yaw Rate Sensor Communication Stop Mode	Combination Meter ECU Communication Stop Mode
   Skid Control ECU	U0073	X	X	X	X	X
   	U0100	□ During driving	X	X	X	X
   	U0123	X	X	X	◦	X
   	U0124	X	X	X	◦	X
   	U0126	X	X	◦	X	X
   ECM	U0100	□ During distance control	X	X	X	X
   	U0122	X	□ During distance control	X	X	X
   	U0123	X	X	X	□ During distance control	X
   	U0126	X	X	□ During distance control	X	X
   	U1101	X	X	X	X	X
   Combination Meter ECU	U0100	◦	X	X	X	X
   	U0129	X	◦	X	X	X
   AFS ECU	B2427	◦	◦	◦	X	X
   Seat Belt Control ECU	U0100	◦	X	X	X	X
   	U0122	X	◦	X	X	X
   	U0151	X	X	X	X	X
   	U1101	X	X	X	X	X
   Multiplex tilt and telescopic ECU	B2621	X	X	X	X	◦
   HINT: ◦: Set X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens □: Set under the condition shown in the table above

   DTC COMBINATION TABLE (CAN NO 1 BUS)
   
   

   DTC		Trouble Mode
   Output from	Output DTC	Air Conditioning Amplifier Communication Stop Mode	Center Airbag Sensor Communication Stop Mode	Gateway ECU Communication Stop Mode (*2)	Active Control Engine Mount ECU Communication Stop Mode	Main Body ECU Communication Stop Mode	Navigation ECU Communication Stop Mode (*1)
   Skid Control ECU	U0073	X	X	X	X	X	X
   	U0100	X	X	X	X	X	X
   	U0123	X	X	X	X	X	X
   	U0124	X	X	X	X	X	X
   	U0126	X	X	X	X	X	X
   ECM	U0100	X	X	X	X	X	X
   	U0122	X	X	X	X	X	X
   	U0123	X	X	X	X	X	X
   	U0126	X	X	X	X	X	X
   	U1101	X	X	□ During distance control	X	X	X
   Combination Meter ECU	U0100	X	X	X	X	X	X
   	U0129	X	X	X	X	X	X
   AFS ECU	B2427	X	X	◦	X	◦	X
   Seat Belt Control ECU	U0100	X	X	◦	X	X	X
   	U0122	X	X	◦	X	X	X
   	U0151	X	◦	◦	X	X	X
   	U1101	X	X	X	X	X	X
   Multiplex tilt and telescopic ECU	B2621	X	X	X	X	X	X
   HINT: ◦ O: Set X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens (*1): with Navigation system (*2): Only when any ECU is connected to the CAN No. 2 bus wire (See SKID CONTROL ECU COMMUNICATION STOP MODE  ) (See STEERING ANGLE SENSOR COMMUNICATION STOP MODE  ) (See YAW RATE SENSOR COMMUNICATION STOP MODE  ) (See GATEWAY ECU COMMUNICATION STOP MODE  ) (See ECM COMMUNICATION STOP MODE  ) (See MAIN BODY ECU COMMUNICATION STOP MODE  ) (See ACTIVE CONTROL ENGINE MOUNT ECU COMMUNICATION STOP MODE  ) (See CENTER AIRBAG SENSOR COMMUNICATION STOP MODE  ) (See NAVIGATION ECU COMMUNICATION STOP MODE  ) (See COMBINATION METER ECU COMMUNICATION STOP MODE  ). (See AIR CONDITIONING AMPLIFIER COMMUNICATION STOP MODE  ).