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

4F-50 Electronic Stability Program:
DTC Troubleshooting
Step
1 Was "Electronic Stability Program Check" performed?
2 DTC check for ESP®
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC for ESP®.
Is DTC U1073 indicated?
3 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
4 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector.
• ECM
• Keyless start control module (if equipped)
• Combination meter
• Steering angle sensor
• BCM
3) Recheck DTC for ESP®.
Is DTC U1073 detected?

DTC U1100: Lost Communication with ECM (Reception Error)

Wiring Diagram
Refer to "Wiring Diagram" under "DTC U1073: Control Module Communication Bus Off".
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
ECM message data is missing from CAN communication. • CAN communication circuit
DTC Troubleshooting
Step
1 Was "Electronic Stability Program Check" performed?
2 DTC check for ESP®
1) Check DTC for ESP®.
Is DTC U1100 and DTC U1073 detected together?
3 DTC check for ECM
1) Check DTC for ECM.
Is DTC P1674 detected?
Action
Action
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Check ESP® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP®
hydraulic unit / control
module assembly and
recheck.
Trouble Area
• ECM
• ESP® control module
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".
No
Go to "Electronic
Stability Program
System Check".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Repair or replace the
CAN communication
line.
Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.
S7RS0B4604058
No
Go to "Electronic
Stability Program
System Check".
Go to Step 3.
Go to Step 4.