Open in One Side of CAN Branch Line
Open in One Side of CAN Branch LineDESCRIPTION
If some ECUs and sensors are not displayed on the "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.
HINT: If some ECUs and sensors repeatedly appear and disappear from the "BUS CHECK" screen, communication between the normal ECUs (sensors) and intelligent tester may be affected by the incomplete signals that are output from the ECU that has an open circuit in either of its CAN branch lines. In this case, the CAN branch lines for the ECUs and sensors that repeatedly appear and disappear from the screen are normal and the ECU that is not displayed on the screen may be the main cause of the problem (this ECU may have an open circuit in either of its CAN branch lines).
Wiring Diagram (Part 1):
Wiring Diagram (Part 2):
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INSPECTION PROCEDURE