Tacoma

Toyota Tacoma 2015-2018 CAN Workshop Manual

(d) If a communication error is indicated on both the V bus and sub
bus on the CAN Bus Check screen, suspect any communication
stop displayed for the V bus first.
Example: Open in both CAN branch lines of ECU C on the V bus
Text in Illustration
*a Not displayed or background color changes to red
HINT:
I
n the CAN bus check, it is possible to confirm the communication
status of ECUs connected to the V bus after connecting the
Techstream to the DLC3. As for sub buses, it is possible to confirm
which sub bus connected ECUs can communicate with a gateway
function equipped ECU on the V bus.
If a gateway function equipped ECU has a communication error,
ECUs connected to the gateway function equipped ECU are also
affected, and communication stops will be indicated.
The CAN Bus Check screen in the illustration shows that ECU C
has a gateway function and a communication stop in ECU C is
suspected.
(e) If the CAN Bus Check screen indicates a communication stop only
in the sub bus, a communication stop in the sub bus is suspected.
Example: Open in both CAN branch lines of ECU G on the sub bus
Text in Illustration
*a Background color changes to red
HINT:
A
communication error in a sub bus does not affect the V bus or
other buses.
When a gateway function equipped ECU has memorized the ECUs
that are connected to the sub bus, if any of the ECUs connected
to the gateway function equipped ECU has a communication error,
the background color changes to yellow or red. (The displayed
name will not disappear.)
(f) If both of the V bus main bus lines are open, ECUs or sensors that are located farther away from the DLC3
than the open part will be displayed as a communication stop on the CAN Bus Check screen.
(In this case, ECU A and B are not displayed or their background color changes to red.)
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