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: OBD/MOBD MENU Screen - Bus Check

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press "ENTER" on the intelligent tester screen via CAN VIM.
   Fig 2: Intelligent Tester 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:

   If ECUs or sensors that should be properly connected are not displayed, there is a communication stop in the system.

   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 REFERENCE
   
   

   ECU/Sensor name	Check method
   Skid control ECU	Installed on all vehicles
   Steering sensor	Installed on all vehicles
   Yaw rate sensor	Installed on all vehicles
   HV control ECU	Installed on all vehicles
   Network gateway ECU	Installed on all vehicles
   Power steering ECU	Installed on all vehicles
   Distance control ECU	Dynamic laser cruise control
   Television camera ECU	Rear View Monitor 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  . (If, however, U0235 is output alone, see the dynamic laser cruise control system.)

1. HV control ECU (HV)

   HINT:

   • DTC communication uses the CAN communication system.
   • Distance control ECU data is also output.
     DETECTION ITEM
     
     

     DTC No.	Detection Item
     P3108-594	A/C Amplifier Communication Circuit Malfunction
     P0A1D-615	Communication Error from HV ECU
     U0100-211	Lost Communication With ECM/PCM "A"
     U0100-212	Lost Communication With ECM/PCM "A"
     U0100-530	Lost Communication With ECM/PCM "A"
     U0100-774	Lost Communication With ECM/PCM "A"
     U0100-784	Lost Communication With ECM/PCM "A"
     U0122-732	Lost Communication With Vehicle Dynamics Control Module
     U0123-736	Lost Communication Error of Yaw Rate Sensor
     U0126-735	Lost Communication With Steering Angle Sensor Module
     U0129-220	Lost Communication With Brake System Control Module
     U0129-222	Lost Communication With Brake System Control Module
     U0129-528	Lost Communication With Brake System Control Module
     U0129-529	Lost Communication With Brake System Control Module
     U0293-730	Lost Communication With Distance Control ECU
     U0293-733	Lost Communication With Vehicle Dynamics Control Module
     U0131-433	Lost Communication with Power Steering Control Module
     U0131-434	Lost Communication With Power Steering Control Module
     U0146-435	Lost Communication With Gateway "A"
     U1101-728	Lost Communication With Distance Control ECU

   • *1: Displayed on the "communication malfunction DTCs" screen of the intelligent tester. If U0235 is output alone, the CAN communication system is normal (See for DTC U0100 ).
   • Check for INFORMATION (See INFORMATION / FREEZE FRAME DATA )
   • U0110-159, U0110-160, U0110-656, U0110-657 are not the DTCs for the CAN communication system. Therefore, refer to HOW TO PROCEED WITH TROUBLESHOOTING for the hybrid control system.
2. HV Control ECU (ENGINE)
   DETECTION ITEM
   
   

   DTC No.	Detection Item
   U0001	Control Module Communication Bus Off
   U0293	Communication Error from HV ECU

3. Skid control ECU

   HINT:

   DTC communication uses the SIL line.

   DETECTION ITEM
   
   

   DTC No.	Detection Item
   U0073	Control Module Communication Bus Off
   U0123	Lost Communication With Yaw Rate Sensor Module
   U0124	Lost Communication With Lateral Acceleration Sensor Module
   U0126	Lost Communication With Steering Sensor Module
   U0293-152	Lost Communication With HV Control Module
   U0293-153	Lost Communication With HV Control Module
   U0293-154	Lost Communication With HV Control Module

   HINT:

   Check for INFORMATION. (See FREEZE FRAME DATA )

4. Power steering ECU

   HINT:

   DTC communication uses the SIL line.

   DETECTION ITEM
   
   

   DTC No.	Detection Item
   U0073	Control Module Communication Bus Off
   U0105	Lost Communication With ECM/PCM "A"
   U0121	Lost Communication With Anti-lock Brake System (ABS) Control Module

5. Gateway ECU

   HINT:

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

Fig 4: DTC Combination Trouble Mode Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC Output ECU 

1. Perform troubleshooting according to the combination of DTCs output.

   HINT:

   • HYBRID VEHICLE CONTROL ECU COMMUNICATION STOP MODE 
   • SKID CONTROL ECU COMMUNICATION STOP MODE 
   • YAW RATE SENSOR COMMUNICATION STOP MODE 
   • STEERING SENSOR COMMUNICATION STOP MODE 
   • GATEWAY ECU COMMUNICATION STOP MODE 
   • POWER STEERING ECU COMMUNICATION STOP MODE 
   • DISTANCE CONTROL ECU COMMUNICATION STOP MODE 
   • TELEVISION CAMERA ECU COMMUNICATION STOP MODE