Suzuki Swift Sport 2004 Service & Repair Manual page 627

DTC Troubleshooting
Step
1 Was "Electronic Stability Program Check" performed?
2 DTC check for ESP®
1) Check DTC for ESP®.
Is DTC U1140 and DTC U1073 detected together?
3 DTC check for BCM
1) Check DTC for BCM.
Is DTC U1073 detected?
4 Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Check DTC for ESP®.
Is DTC U1140 detected?
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP® control module and
BCM communicating by means of CAN.
3) Check CAN communication circuit between ESP®
control module and BCM for open, short and high
resistance.
Is each CAN communication circuit in good condition?
6 CAN communication circuit check
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 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
• Combination meter
• Steering angle sensor
• BCM
3) Check DTC for ESP®.
Is DTC U1140 detected?
Action
Electronic Stability Program:
Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Bus
Off".
Go to "DTC U1073 (No.
1073): Control Module
Communication Bus Off
in Section 10B".
Go to Step 4.
Repair or replace the
CAN communication
line.
Go to Step 7.
Check ESP® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP®
hydraulic unit / control
module assembly and
recheck.
4F-53
No
Go to "Electronic
Stability Program
System Check".
Go to Step 3.
Go to Step 4.
Check for intermittent
trouble referring to
"Intermittent and Poor
Connection Inspection
in Section 00".
Go to Step 6.
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.