Suzuki GRAND VITARA JB416, Service Manual

Page: 306 / 474

4F-43 Electronic Stability Program:
DTC U1139: Lost Communication with 4WD Control Module (Reception Error)
S5JB0E4604044
Wiring Diagram
Refer to “DTC U1101: Lost Communication with TCM (Reception Error): ”.
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC Detecting Condition Trouble Area
4WD control module message data is missing from CAN
communication. (if equipped 4WD control module) • CAN communication circuit
• 4WD control module
• ESP
®
control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 DTC check for ESP
®
1) Check DTC for ESP
®
.
Is DTC U1139 and DTC U1073 detected together?
Go to “DTC U1073:
Control Module
Communication Bus
Off: in Section 4E” for
troubleshooting. Go to Step 3.
3 DTC check for 4WD control module
1) Check DTC for 4WD control module.
Is DTC P1073 detected?
Go to “DTC U1073:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator) in Section 3C”
for troubleshooting. Go to Step 4.
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?
Go to Step 4. Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection:
in Section 00 in related
manual”.
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP
®
control module and
4WD control module communicating by means of CAN.
Is each CAN communication circuit between ESP
®
control
module and 4WD control module opened, shorted or high
resistance?
Repair or replace the
CAN communication
line. Go to Step 6.
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
®
control module and 4WD
control module) opened, shorted or high resistance?
Go to Step 7. Repair or replace the
CAN communication
line.