Tacoma

Toyota Tacoma 2015-2018 CAN Workshop Manual

(h) When any of the following malfunctions occur, CAN
communication cannot be established and almost all ECUs and
sensors on the bus show a communication error on the CAN Bus
Check screen.
Text in Illustration
*a When any of the following malfunctions occur on the V bus
*b When any of the following malfunctions occur on a sub bus
*c Not displayed
Details of Malfunction
Short between CAN lines (CANH and CANL)
Short between a CAN line (CANH or CANL) and +B
Short between a CAN line (CANH or CANL) and ground
Open in a CAN main bus line
HINT:
W
hen a malfunction occurs on the V bus, almost all ECUs and
sensors on the V bus and sub bus indicate a communication error
(almost all ECUs are not displayed). As communication with the
gateway function equipped ECU that is connected to the V bus
stops, communication from the ECUs connected to the sub bus
that is monitored by the gateway function equipped ECU also
stops (these ECUs are not displayed).
When a malfunction occurs in a sub bus, almost all ECUs
connected to the sub bus indicate a communication error.
A communication error in a sub bus does not affect the V bus or
other buses.
The malfunctioning part can be determined by checking for a
short circuit between CAN bus lines or between a CAN bus line
and ground or +B short using an electrical tester.
5. HOW TO INTERPRET COMMUNICATION DTCS (DTCS THAT START WITH U)
(a) If a CAN communication error cannot be reproduced, determine the suspected malfunctioning part using
the DTCs stored in ECUs that are connected to the CAN buses by following the procedure below.
HINT:
Communication DTCs (DTCs that start with U) indicate a communication error between the ECU that stores
the DTC and the ECU that is indicated by the DTC.
(1) If multiple ECUs store a communication DTC for a particular ECU, a communication stop of the ECU is
suspected.
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