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 > Sfi System: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) (P0327,P0328,P032C,P032D,P0332,P0333,P033C,P033D)
DESCRIPTION A flat type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 kHz and 15 kHz. Knock sensors are fitted onto the engine block to detect engine knocking. The knock sensor contains a piezoelectric element which generates a voltage when it be ...
