Suzuki GRAND VITARA JB416, Service Manual

Page: 433 / 474

Body Electrical Control System: 10B-13
DTC U1100 (No. 1100): Lost Communication with ECM
S5JB0EA204014
Wiring Diagram
Refer to “DTC U1073 (No. 1073): Control Module Communication Bus Off: ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
DTC Troubleshooting
3 DTC check of BCM
1) Turn ignition switch to OFF position.
2) Connect connectors of disconnected control modules
communicating by means of CAN.
3) Disconnect connector from any one of control modules
other than BCM.
4) Recheck DTC for BCM.
Is DTC U1073 detected?
Disconnect connectors
of control modules other
than the one whose
connector is
disconnected in Step 3)
one by one and check
that DTC U1073 is
detected by BCM each
time connector is
disconnected. When
DTC U1073 is not
detected by BCM while
checking in this way, go
to description under
“NO” below. If DTC
U1073 is detected by
BCM even when
connectors of all control
modules that use CAN
communication with
BCM are disconnected,
substitute a known-
good BCM and recheck. Check power and
ground circuit of control
module disconnect in
Step 3). If circuit is OK,
substitute a known-
good control module
disconnected in Step 3)
and recheck.
Step Action Yes No
DTC detecting condition Trouble area
BCM can not receive CAN data from ECM for
longer than specified time continuously. • CAN communication circuit
• BCM
• ECM
Step Action Yes No
1 DTC check of BCM
Is DTC U1100 (No. 1100) and DTC U1073 (No. 1073)
detected together?
Go to “DTC U1073 (No.
1073): Control Module
Communication Bus
Off: ”. Go to Step 2.
2 DTC check of ECM
1) Check ECM for DTC.
Is DTC P1674 detected?
Go to “DTC P1674:
CAN Communication
(Bus Off Error): in
Section 1A”. Go to Step 3.
3 DTC check of ABS or ESP
®
control module
1) Check DTC for ABS or ESP
®
control module.
Is DTC U1073 detected?
Go to “DTC U1073:
Control Module
Communication Bus
Off: in Section 4E”. Go to Step 4.