Lexus IS250 IS220d GSE20 ALE20 - CAN COMMUNICATION
CAN COMMUNICATION SYSTEM (for RHD) - DIAGNOSIS SYSTEM
| BUS CHECK (COMMUNICATION MALFUNCTION DTC) |
- HINT:
- Only CAN communication system DTCs for each ECU can be displayed on the intelligent tester.
Select "Bus Check" from the "System select" screen on the intelligent tester.
Select "Communication Malfunction DTC" from the "Bus Check" screen, and then select "Enter".
Select the system of the DTC to be checked and select "Details".
CAN communication system DTC(s) is/are displayed.
| BUS CHECK (COMMUNICATION BUS CHECK) |
- HINT:
- The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the intelligent tester.
Select "Communication Bus Check" from the "Bus Check" screen.
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.
"There is no system connected to the communication bus" is displayed if there are no ECUs or sensors connected to the CAN bus.
| 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 equipment. Check which systems (ECUs, sensors) are installed on the vehicle.
| 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 |
| Distance control ECU | Dynamic radar cruise control |
| Gateway ECU | Installed on all vehicles |
| Seat belt control ECU | Dynamic radar cruise control |
| Power steering ECU | Installed on all vehicles |
| Television camera ECU | Parking assist monitor system |
| 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.
| 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 ( for U0235, for U1102).
*3: Dynamic radar cruise DTC.
ECM/Intelligent tester display "ECT"
- HINT:
DTC communication uses the CAN communication system.
| 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/TRC"
- HINT:
- DTC communication uses the SIL line.
| 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.
| 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 "Pre-crash Seat Belt"
- HINT:
- DTC communication uses the SIL line.
| 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 ( for U0235, for U1102).
TELEVISION CAMERA ECU/Intelligent tester display "Parking Assist Monitor"
- HINT:
- The DTC is displayed on the multi-display assembly (not displayed on the intelligent tester)
| DTC No. | Detection Item |
| 5C-42 | Steering angle sensor communication line malfunction |
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 | 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 | ○ | X | X | X | X |
| U0100 | □ During driving | X | X | X | □ During driving | |
| U0123 | ○ | X | ○ | X | X | |
| U0124 | ○ | X | ○ | X | X | |
| U0126 | ○ | ○ | 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 | ○ |
| U0121 | ○ | X | X | X | X | |
| Television Camera ECU | 5C-42 | X | ○ | X | X | X |
| Seat Belt Control ECU | U0100 | X | X | X | X | ○ |
| U0122 | ○ | X | X | X | X | |
| U1101 | X | X | X | X | X | |
| U0151 | X | X | X | X | X | |
| 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 | Television Camera 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 | ○ | X | X |
| U0121 | X | X | ○ | X | X | |
| Television Camera ECU | 5C-42 | X | X | X | ○ | X |
| Seat Belt Control ECU | U0100 | X | X | X | X | X |
| U0122 | X | X | X | X | X | |
| U1101 | ○ | X | X | X | X | |
| U0151 | X | X | X | X | ○ | |
- HINT:
○: Set
X: Not set or may be set according to the malfunction part when one side of the CAN branch lines opens.
□: Set under the condition shown in the table
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:
Distance Control ECU Communication Stop Mode:
Seat Belt Control ECU Communication Stop Mode:
Power Steering ECU Communication Stop Mode:
Television Camera ECU Communication Stop Mode:
Center Airbag sensor Communication Stop Mode: