Open in One Side of CAN Branch Line: Description

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

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

HINT:

If some ECUs and sensors repeatedly appear and disappear the "CAN Bus Check" from screen, communication between the normal ECUs (sensors) and the Techstream may be affected by the incomplete signals that are output from the ECU that has an open circuit in either of its CAN branch wires. In this case, the CAN branch wires 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 wires).

Symptom	Trouble Area
2 or more ECUs and/or sensors do not appear on the Techstream "CAN Bus Check" screen.	One side of the CAN branch wire is open, or output signals are incomplete. Skid control ECU Steering angle sensor Yaw rate sensor Power steering ECU Air conditioning amplifier Main body ECU Center airbag sensor assembly ECM Combination meter Accessory gateway