Dtc U1139: Lost Communication With 4Wd Control Module (Reception Error) - Suzuki GRAND VITARA JB416 Service Manual

4F-43 Electronic Stability Program:

DTC U1139: Lost Communication with 4WD Control Module (Reception Error)

Wiring Diagram
Refer to "DTC U1101: Lost Communication with TCM (Reception Error): ".
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
4WD control module message data is missing from CAN
communication. (if equipped 4WD control module)
DTC Troubleshooting
Step
1 Was "Electronic Stability Program Check" performed?
2 DTC check for ESP®
1) Check DTC for ESP®.
Is DTC U1139 and DTC U1073 detected together?
3 DTC check for 4WD control module
1) Check DTC for 4WD control module.
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
4WD control module communicating by means of CAN.
Is each CAN communication circuit between ESP
module and 4WD control module 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
control module) opened, shorted or high resistance?
Action
®
®
control module and 4WD
Trouble Area
• CAN communication circuit
• 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:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator) in Section 3C"
for troubleshooting.
Go to Step 4.
Repair or replace the
CAN communication
line.
control
Go to Step 7.
S5JB0E4604044
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.
Repair or replace the
CAN communication
line.