Dtc U1140: Lost Communication With Bcm (Reception Error) - Suzuki GRAND VITARA JB416 Service Manual

Step
7 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector.
• ECM
• TCM (for A/T model)
• BCM
• 4WD control module
• Keyless start control module (if equipped)
• Steering angle sensor
3) Check DTC for ESP®.
Is DTC U1139 detected?

DTC U1140: Lost Communication with BCM (Reception Error)

Wiring Diagram
Refer to "DTC U1101: Lost Communication with TCM (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 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.
Is each CAN communication circuit between ESP
module and BCM opened, shorted or high resistance?
Action
Action
®
Electronic Stability Program:
Yes
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
• 4WD control module
• ESP® control module
Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Bus
Off: in Section 4E" for
troubleshooting.
Go to "DTC U1073 (No.
1073): Control Module
Communication Bus
Off: in Section 10B" for
troubleshooting.
Go to Step 4.
Repair or replace the
CAN communication
line.
control
4F-44
No
Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.
S5JB0E4604045
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.