Tacoma

Toyota Tacoma 2015-2018 CAN Workshop Manual

(2) Open in a CAN branch line (CANL)
HINT:
An abnormal waveform is output from an ECU with an open in one
of its CAN branch lines. Because this abnormal output interferes
with the signals from other ECUs, the output of other ECUs will
also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or
performing a CAN bus check, or by checking waveform changes
when ECUs or sensors are disconnected. The waveform will
change to one for an open in both sides of a CAN branch when
the ECU or sensor with an open CAN branch line is disconnected.
(3) Open in a CAN main bus line (CANH)
HINT:
Waveforms of ECUs or sensors that are closer to the DLC3 than
the open part are almost normal.
Waveforms of ECUs or sensors that are on the opposite side of
the DLC3 from the open part are abnormal.
An open in a CAN main bus line can be confirmed by measuring
the resistance between the CANH and CANL terminals of any CAN
branch.
(4) Short between a CAN bus line (CANH) and ground
HINT:
Narrow down the shorted part by checking for waveform changes
when disconnecting connectors from the CAN junction connectors
or when disconnecting ECUs or sensors.
A short to ground in the CANH line can be confirmed by
measuring the resistance between CANH and ground using an
ohmmeter.
(5) Short between a CAN bus line (CANL) and ground
HINT:
Narrow down the shorted part by checking for waveform changes
when disconnecting connectors from the CAN junction connectors
or when disconnecting ECUs or sensors.
A short to ground in the CANL line can be confirmed by measuring
the resistance between CANL and ground using an ohmmeter.
10. DATA SENDING/RECEIVING TABLE
(a) Data sending/receiving table
HINT:
I
f Data List items related to sent/received data are not displayed properly, the part for which communication
is interrupted can be determined using the table below.
DATA
CONTENT
DATA DETECTED
AND SENT BY
DATA RECEIVED BY
(CAN BE CHECKED IN
DATA RECEIVED BY
(CANNOT BE CHECKED
RELEVANT DATA LIST
ITEM
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