BUS CHECK (COMMUNICATION MALFUNCTION DTC)
Tech Tips
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)
Tech Tips
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.
Tech Tips
If any properly connected ECUs or sensors are not displayed, there is a communication stop in the system Click here.
"There is no system connected to the communication bus" is displayed if there are no ECUs or sensors connected to the CAN bus.
CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION
Systems (ECUs and sensors) that use CAN communication vary depending on the optional settings of the vehicle. Check which systems (ECUs and sensors) are installed on the vehicle.
| ECU/Sensor Name | Tester Display | Installed on |
|---|---|---|
| ECM | ECM (Engine) | All vehicles |
| Transmission control ECU assembly (TCM) | TCM | All vehicles |
| Brake actuator assembly (skid control ECU) | Skid Control (ABS/VSC/TRAC) | All vehicles |
| Yaw rate sensor assembly | Yaw Rate Sensor | All vehicles |
| Spiral cable sub-assembly (steering angle sensor) | Spiral cable (Steering Angle Sensor) | All vehicles |
DTC TABLE BY ECU
Tech Tips
In the CAN communication system, CAN communication system DTCs output by the ECU can be displayed by using the intelligent tester.
If CAN communication system DTCs are output, the trouble cannot be determined solely from the DTCs. Perform troubleshooting according to "How to Proceed with Troubleshooting" Click here.
SKID CONTROL ECU
Tech Tips
DTC communication uses the CAN communication system.
| 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 |
ECM
Tech Tips
The ECM is connected to the CAN communication system but CAN communication DTCs are not stored.
STEERING ANGLE SENSOR
Tech Tips
The steering angle sensor is connected to the CAN communication system but CAN communication DTCs are not stored.
YAW RATE SENSOR
Tech Tips
The yaw rate sensor is connected to the CAN communication system but CAN communication DTCs are not stored.
DTC COMBINATION TABLE
Confirm the trouble mode according to the combination of stored DTCs.
| Trouble Mode | U0073 | U0100 | U0123 | U0124 | U0126 |
|---|---|---|---|---|---|
| Skid control ECU communication stop mode | ○ | ○ | ○ | ○ | ○ |
| Yaw rate sensor communication stop mode | - | - | ○ | ○ | - |
| Steering sensor communication stop mode | - | - | - | - | ○ |
| ECM communication stop mode | - | ○ | - | - | - |
Tech Tips
If CAN communication system DTCs are output even though all ECUs and sensors connected to the CAN communication system are displayed on the intelligent tester's "Bus Check" screen, the DTCs may be previous CAN communication system DTCs.
U0073, U0100, U0123, U0124 and U0126 are the DTCs in the CAN communication system. The above table shows combinations of these DTCs.
○: Stored
-: Not stored