DESCRIPTION If an ECU or sensor is not displayed on the "CAN Bus Check" screen of the Techstream 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 wire of one pair of CAN branch wires. HINT: If some ECUs and sensors repeatedly appear and disappear from the "CAN Bus Check" 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).
CAUTION / NOTICE / HINT CAUTION: When performing the confirmation driving pattern, obey all speed limits and traffic laws. NOTICE:
PROCEDURE
(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication. Click here (b) Using the Techstream, select and perform "CAN Bus Check" Click here (c) Observe the screen for approximately 2 minutes to check the ECUs and sensors that are not displayed on the screen and also those that repeatedly appear and disappear from the screen. (d) Check the applicable communication stop mode for the ECU or sensor that is not displayed on the screen.
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Toyota Tundra Service Manual > Tire Pressure Warning System: Transmitter ID not Received in Main Mode (C2126/26)
DESCRIPTION After the tire pressure warning valve and transmitter ID registration is completed using the Techstream or ID registration was canceled via the automatic ID registration function, DTC C2126/26 is output from the tire pressure warning ECU and receiver. After ID registration is complete us ...
