Tacoma

Toyota Tacoma 2015-2018 CAN Workshop Manual

10.
CHECK RESULT OF CAN BUS CHECK (CONNECTION STATUS CHECK USING
TECHSTREAM)
(a) Inspect or repair the probable malfunctioning part based on the check result of step 6 (the step in
which CAN bus check was performed).
Result of CAN Bus Check (Connection Status Check Using Techstream):
RESULT PROCEED
TO
All ECUs and sensors connected to the CAN communication system are displayed on the screen.
(CAN bus circuit is currently normal.)
A
All ECUs except the network gateway ECU connected to sub bus 2 are not displayed on
the screen.
The network gateway ECU (Gateway) outputs DTC U1002.
(Open or short in sub bus 2 main lines.)
B
All ECUs connected to sub bus 2 are not displayed on the screen.
(Open in network gateway ECU branch lines or network gateway ECU malfunction.)
C
One of the ECUs and sensors connected to the V Bus is not displayed on the screen.
(Open in ECU or sensor branch lines, or communication interrupted.)
D
One of the ECUs and sensors connected to sub bus 2 is not displayed on the screen.*
(Open in ECU or sensor branch lines, or communication interrupted.)
E
In addition to ECUs and sensors which are connected to the CAN communication system but are not
displayed on the screen, there are ECUs or sensors for which the detection status changes (changes
between detected and not detected) during the inspection.
(Open in one side of ECU or sensor branch lines.)
F
NOTICE:
*
: In this case, as the network gateway ECU (Gateway) outputs communication DTCs (DTCs that start with
U), the problem area can be determined from those DTCs.
Non-installed ECUs or sensors will not be displayed. Do not mistake them for being in communication stop
mode.
It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down
menu on the Techstream. This is not a malfunction. (This occurs when optional devices are not on a sub
bus that is monitored by a gateway function equipped ECU.)
HINT:
Regarding CAN Bus Check, refer to How to Interpret CAN Bus Check Screen .
If the detection status of ECUs changes during the inspection, one of the branch lines of a connected ECU
or sensor may be open. (Signals from the ECU or sensor that has an open in one of its branch lines create
electrical noise, affecting response to the Techstream and whether or not the ECUs and sensors are
displayed.)
Regarding the ECUs connected to sub bus 2, the network gateway ECU displays communicating ECUs on
the Techstream. If the communication between the network gateway ECU and an ECU stops for 10 seconds
or more, the ECU will no longer be displayed on the Techstream.
Regarding the communication stop mode for ECUs connected to sub bus 2, refer to the inspection
procedure for the DTCs that indicate a communication stop.
cardiagn.com

Leave a Reply

Your email address will not be published. Required fields are marked *