When communication fails in any of the CAN bus lines (communication lines), a fail-safe function(s) will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

Select "Bus Check" from the "System Select" screen on the intelligent tester.

CAN LH J/C

Lexus IS250 IS220d GSE20 ALE20 CAN COMMUNICATION

Check the CAN bus lines .

The CAN (Control Area Network) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed (500 kbps) and the ability to detect malfunctions.

Lexus IS250 IS220d GSE20 ALE20 CAN COMMUNICATION

Lexus IS250 IS220d GSE20 ALE20 CAN COMMUNICATION

Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.

If some ECUs and sensors are not displayed on the "Communication Bus Check" screen of the intelligent tester and some ECUs and sensors repeatedly appear and disappear from the screen when the CAN main bus lines are normal (there is no open, short, short to B+, or short to GND in the main bus lines), there may be an open circuit in either of the CAN branch lines.