Dtc U1100: Lost Communication With Ecm (Reception Error) - Suzuki Swift Sport 2004 Service & Repair Manual

4E-27 ABS:

DTC U1100: Lost Communication with ECM (Reception Error)

Wiring Diagram
Refer to "DTC U1073: Control Module Communication Bus Off".
DTC Detecting Condition
Reception error of communication data for ECM is detected more than specified time continuously.
DTC Troubleshooting
Step
1 Was "ABS Check" performed?
2 1) Check DTC for ABS.
Is DTC U1073 detected?
3 1) Check DTC for ECM.
Is DTC P1674 detected?
4 1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Check DTC for ABS.
Is DTC U1100 detected?
5 1) Turn ignition switch to OFF position.
2) Disconnect connectors of ABS control module and ECM
communicating by means of CAN.
3) Check CAN communication circuit between ABS control
module and ECM for open, short and high resistance.
Is CAN communication circuit in good condition?
6 1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control
modules other than Step 5 for open, short and high
resistance.
Is each CAn communication circuit in good condition?
7 1) Turn ignition switch to OFF position.
2) Connect connector of disconnected control modules
communicating by means of CAN.
3) Disconnect connector from any one of control modules
other than BCM and ABS control module.
4) Recheck ABS control module for DTC
IS DTC U1100 detected?
Action Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Bus
Off".
Go to "DTC P1674:
CAN Communication
(Bus Off Error) in
Section 1A".
Go to Step 5.
Go to Step 6.
Go to Step 7.
Disconnected
connectors of control
modules other than the
one whose connector is
disconnected in Step 3)
one by one and check
that DTC U1100 is
detected by ABS control
module each time
connector is
disconnected.
When DTC U1100 is not
detected by ABS
module while checking
in this way, go to
description under "NO"
below. If DTC U1100 is
detected by ABS control
module, go to Step 8.
S7RS0B4504019
No
Go to "ABS Check".
Go to Step 3.
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00" in related manual.
Repair or replace the
CAN communication
line.
Repair or replace the
CAN communication
line.
Check power and
ground circuit of control
module disconnected in
Step 3) circuit is OK,
substitute a know-good
control module
disconnected in Step 3)
and recheck.