Suzuki GRAND VITARA 2005 Service Manual page 422

4F-45 Electronic Stability Program:
DTC U1140: Lost Communication with BCM (Reception Error)
Wiring Diagram
Refer to "DTC U1126: Lost Communication with Steering Angle Sensor (Reception Error): ".
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
BCM 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 U1101 and DTC U1073 detected together?
3 DTC check for BCM
1) Check DTC for BCM.
Is DTC P1073 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 U1139 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.
Is each CAN communication circuit between ESP
module and BCM opened, shorted or high resistance?
6 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
Is each CAN communication circuit between disconnected
control modules (other than ESP
opened, shorted or high resistance?
7 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector and check DTC for ESP® in
turn.
• ECM
• BCM
• 4WD control module
• Immobilizer control module (ICM) (if equipped)
• Combination meter
• Steering angle sensor
Is DTC U1139 detected?
Action
®
®
control module and BCM)
Trouble Area
• 4WD control module
• ESP® control module
Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Bus
Off: in Section 4E".
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.
control
Repair or replace the
CAN communication
line.
Check ESP® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP®
hydraulic unit / control
module assembly and
recheck.
S5JB0B4604086
No
Go to "Electronic
Stability Program
Check: ".
Go to Step 3.
Go to Step 4.
Check for intermittent
trouble referring to
"Intermittent and Poor
Connection Inspection:
in Section 00 in related
manual".
Go to Step 6.
Go to Step 7.
Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.