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 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.
  
  Fig 2: Intelligent Tester Data
  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: Screen Display - Bus Check
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK FOR INSTALLED SYSTEMS (ECUS AND 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.

CHECK METHOD DESCRIPTION TABLE

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

DTC TABLE BY ECU

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 . (If however, U0235 or U01102 is output alone, see the dynamic radar cruise control system.)

ECM/Intelligent tester display "ENGINE"

HINT:

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

ECM/INTELLIGENT TESTER DISPLAY "ENGINE"

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, DTC U1102 LOST COMMUNICATION WITH RADAR SENSOR for U1102).

⁽³⁾ Dynamic radar cruise DTC.

ECM/Intelligent tester display "ECT"

HINT:

DTC communication uses the CAN communication system.

ECM/INTELLIGENT TESTER DISPLAY "ECT"

DTC No.

Detection Item

U0100 (⁽¹⁾)

Lost Communication With ECM/PCM "A"

⁽¹⁾ The ECM is malfunctioning if U0100 is output.

Replace ECM.

SKID CONTROL ECU/Intelligent tester display "ABS/VSC/TRAC"

HINT:

DTC communication uses the SIL line.

SKID CONTROL ECU/INTELLIGENT TESTER DISPLAY "ABS/VSC/TRAC"

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

POWER STEERING ECU/Intelligent tester display "EPS"

HINT:

DTC communication uses the CAN communication system.

POWER STEERING ECU/INTELLIGENT TESTER DISPLAY "EPS"

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

SEAT BELT CONTROL ECU/Intelligent tester display "PSB"

HINT:

DTC communication uses the SIL line.

SEAT BELT CONTROL ECU/INTELLIGENT TESTER DISPLAY "PSB"

DTC No.

Detection Item

U0100

Lost Communication With ECM/PCM "A"

U0122

Lost Communication With Vehicle Dynamics Control Module

U0235 (⁽¹⁾)

Lost Communication With Gateway ECU

U1101

Lost Communication With Distance Control ECU

U1102 (⁽¹⁾)

Lost Communication With Radar Sensor

U0151

Lost Communication With Airbag ECU

HINT:

⁽¹⁾	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).

4WD CONTROL ECU/Intelligent tester display "4WD"

HINT:

DTC communication uses the CAN communication system.

4WD CONTROL ECU/INTELLIGENT TESTER DISPLAY "4WD"

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

GATEWAY ECU
HINT:

The gateway ECU is connected to the CAN communication system, but CAN communication DTCs are not output.
CENTER AIRBAG SENSOR
HINT:

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

DTC COMBINATION TABLE

DTC COMBINATION TABLE (1 OF 2)

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
Power Steering ECU	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

DTC COMBINATION MODE (2 OF 2)

DTC		Trouble Mode
Output from	Output DTC	Distance Control ECU Communication Stop Mode	Seat Belt Control ECU Communication Stop Mode	Power Steering ECU Communication Stop Mode	4WD Control ECU Communication Stop Mode	Center Airbag Sensor Communication Stop Mode
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
Power Steering ECU	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.
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 Distance Control ECU Communication Stop Mode
See Seat Belt Control ECU Communication Stop Mode
See Power Steering ECU Communication Stop Mode
See 4WD Control ECU Communication Stop Mode
See Center Airbag Sensor Communication Stop Mode