Diagnosis System

1. Using the Techstream, select "CAN Bus Check" from the "System Select".

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 (with VDIM)	Engine model 2GR-FSE
   Skid control ECU (without VDIM)	Engine model 4GR-FSE
   Steering sensor	Installed on all vehicles
   Yaw rate sensor	Installed on all vehicles
   ECM	Installed on all vehicles
   Distance control ECU	Dynamic radar cruise control
   Gateway ECU	Installed on all vehicles
   Seat belt control ECU	Dynamic radar cruse control
   Power steering ECU	Installed on all vehicles
   4WD control ECU	4 wheel drive
   Center airbag sensor	Installed on all vehicles

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 ). (If however, U0235 or U01102 is output alone, see the DYNAMIC RADAR CRUISE CONTROL SYSTEM .)

1. ECM/Techstream display "Engine"

   HINT:

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

   DTC No.	Detection Item
   U0100 ((3))	Lost Communication With ECM/PCM "A"
   U0101 ((1))	Lost Communication With Transfer Case Control Module
   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))	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) The ECM is malfunctioning if U0101 is output. Replace the ECM. (2) 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, CC-95 for U1102). (3) Dynamic radar cruise DTC.

2. ECM/Techstream display "ECT"

   HINT:

   • DTC communication uses the CAN communication system.
     DTC CHART
     
     

     DTC No.	Detection Item
     U0100 ((1))	Lost Communication With ECM/PCM "A"
     (1) The ECM is malfunctioning if U0100 is output. Replace ECM.

3. SKID CONTROL ECU/Techstream display "ABS/ VSC/TRAC"

   HINT:

   DTC communication uses the SIL line.

   DTC 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

4. POWER STEERING ECU/Techstream display "EPS"

   HINT:

   DTC communication uses the CAN communication system.

   DTC CHART
   
   

   DTC No.	Detection Item
   U0105	Lost Communication With ECM
   U0121	Lost Communication With Anti-lock Brake System (ABS) Control Module

5. SEAT BELT CONTROL ECU/Techstream display "Pre-Collison"

   HINT:

   DTC communication uses the SIL line.

   DTC CHART
   
   

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

6. 4WD CONTROL ECU/Techstream display "Four Wheel Drive Control"

   HINT:

   DTC communication uses the CAN communication system.

   DTC CHART
   
   

   DTC No.	Detection Item
   U0073	Control Module communication Bus Off
   U0100	Lost Communication With ECM/PCM "A"
   U0122	Lost Communication With Vehicle Dynamics Control Module
   U0126	Lost Communication With Steering Angle Sensor Module

7. GATEWAY ECU

   HINT:

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

8. CENTER AIRBAG SENSOR

   HINT:

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

   4. DTC COMBINATION TABLE 

   DTC COMBINATION CHART
   
   

   DTC		Trouble Mode
   Output from	Output DTC	Skid Control ECU Communication Stop Mode	Steering Angle Sensor Communication Stop Mode	Yaw Rate Sensor Communication Stop Mode	Gateway ECU Communication Stop Mode	ECM Communication Stop Mode
   Skid Control ECU	U0073	O	X	X	X	X
   	U0100	□ During driving	X	X	X	□ During driving
   	U0123	O	X	O	X	X
   	U0124	O	X	O	X	X
   	U0126	O	O	X	X	X
   ECM	U0100	X	X	X	X	X
   	U0122	□Control distance	X	X	X	X
   	U0123	X	X	□ Control distance	X	X
   	U0126	X	□ Control distance	X	X	X
   	U1101	X	X	X	X	X
   Power Steering ECU	U0105	X	X	X	X	O
   	U0121	O	X	X	X	X
   4WD Control ECU	U0073	X	X	X	X	X
   	U0100	X	X	X	X	□ During driving
   	U0122	O	X	X	X	X
   	U0126	X	O	X	X	X
   Seat Belt Control ECU	U0100	X	X	X	X	O
   	U0122	O	X	X	X	X
   	U1101	X	X	X	X	X
   	U0151	X	X	X	X	X
   Skid Control ECU	U0073	X	X	X	X	X
   	U0100	X	X	X	X	X
   	U0123	X	X	X	X	X
   	U0124	X	X	X	X	X
   	U0126	X	X	X	X	X
   ECM	U0100	X	X	X	X	X
   	U0122	X	X	X	X	X
   	U0123	X	X	X	X	X
   	U0126	X	X	X	X	X
   	U1101	X	X	X	X	X
   Power Steering ECU	U0105	X	X	O	X	X
   	U0121	X	X	O	X	X
   4WD Control ECU	U0073	X	X	X	O	X
   	U0100	X	X	X	X	X
   	U0122	X	X	X	X	X
   	U0126	X	X	X	X	X
   Seat Belt Control ECU	U0100	X	X	X	X	X
   	U0122	X	X	X	X	X
   	U1101	O	X	X	X	X
   	U0151	X	X	X	X	O
   HINT: O: Set X: Not set or may be set according to the malfunction part when one side of the CAN branch line opens. □: Set under the condition shown in the table. Skid Control ECU Communication Stop Mode: See SKID CONTROL ECU COMMUNICATION STOP MODE  Steering Angle Sensor Communication Stop Mode: See STEERING ANGLE SENSOR COMMUNICATION STOP MODE  Yaw Rate Sensor Communication Stop Mode: See YAW RATE SENSOR COMMUNICATION STOP MODE  Gateway ECU Communication Stop Mode: See YAW RATE SENSOR COMMUNICATION STOP MODE  ECM Communication Stop Mode: See ECM COMMUNICATION STOP MODE  Distance Control ECU Communication Stop Mode: See DISTANCE CONTROL ECU COMMUNICATION STOP MODE  Seat Belt Control ECU Communication Stop Mode: See SEAT BELT CONTROL ECU COMMUNICATION STOP MODE  Power Steering ECU Communication Stop Mode: See POWER STEERING ECU COMMUNICATION STOP MODE  4WD Control ECU Communication Stop Mode: See 4WD CONTROL ECU COMMUNICATION STOP MODE  Center Airbag sensor Communication Stop Mode: See CENTER AIRBAG SENSOR COMMUNICATION STOP MODE