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Description
NFEC1245
CAN (Controller Area Network) is a serial communication line for
real time application. It is an on-vehicle multiplex communication
line with high data communication speed and excellent error detec-
tion ability. Many electonic control units are equipped onto a
vehicle, and each control unit shares information and links with
other control units during operation (not independent). In CAN
communication, control units are connected with 2 communication
lines (CAN H line, CAN L line) allowing a high rate of information
transmission with less wiring. Each control unit transmits/receives
data but selectively reads required data only.
On Board Diagnosis Logic
NFEC1246
DTC
No.
Trouble diagnosis name DTC detecting condition Possible cause
U1000
1000
U1001
1001
CAN communication line
I ECM cannot communicate to other control unit.
I ECM cannot communicate for more than the
specified time.
I Harness or connectors
(CAN communication line is open or
shorted.)
DTC Confirmation Procedure
NFEC1247
1. Turn ignition switch “ON” and wait at least 3 seconds.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. If 1st trip DTC is detected, go to “Diagnostic Procedure”
EC-166.
DTC U1000, U1001 CAN COMMUNICATION LINE
Description
EC-164
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