Dtc U1101: Lost Communication With Tcm - Suzuki GRAND VITARA JB416 Service Manual

3C-51 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

DTC U1101: Lost Communication with TCM

Wiring Diagram
Refer to "DTC U1073: Control Module Communication Bus Off: Motor-Shift Type (Transfer with Shift Actuator)".
DTC Detecting Condition and Trouble Area
DTC detecting condition
Reception error of communication data for TCM is detected for
longer than specified time continuously.
DTC Confirmation Procedure
1) Clear DTC using scan tool.
2) Start engine and run it for 1 min. or more.
3) Stop vehicle and check DTC.
Troubleshooting
Step
1 Was "4WD control system check" performed?
2 DTC check
1) Check DTC in 4WD control module.
Is DTC U1100 and DTC U1073 detected together?
3 DTC check
1) Check DTC in TCM.
Is DTC P1774 detected?
4 Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck in 4WD control module.
Is DTC U1100 detected?
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
Action
Trouble area
• CAN communication circuit
• TCM
• 4WD control module
Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator)".
Go to "DTC P1774:
CAN Communication
Bus Off: in Section 5A".
Go to Step 5.
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck.
S5JB0E3314028
No
Go to "4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)".
Go to Step 3.
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00 in related manual".
Repair circuit.