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: Identifying "BUS CHECK"

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. The screen displays the ECUs that are properly connected to the CAN communication system.

   HINT:

   There is a communication stop in the system of any properly connected ECUs that are not displayed.

Fig 3: Identifying ECU Screen Display

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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:

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

2. Skid control ECU assembly

   HINT:

   DTC communication uses the SIL line.

   DTC TABLE BY ECU
   
   

   DTC No.	Detection Item
   U0073/42	Control Module Communication Bus OFF
   U0100/65	Lost Communication with ECM/PCM "A"

3. GATEWAY ECU

   HINT:

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

HINT:

O : Output

XX: Outputs under the following condition

X: Not output

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

   HINT:

   • See ECM COMMUNICATION STOP MODE 
   • See GATEWAY ECU COMMUNICATION STOP MODE 
   • See TRANSLATE ECU COMMUNICATION STOP MODE