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DTC U1100: Lost Communication with ECM
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 ECM 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 ECM.
Is DTC P1674 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?
Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-50
Action
Trouble area
• CAN communication circuit
• ABS or ESP® hydraulic unit / control module
• ECM
• 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 P1674:
CAN Communication
(Bus Off Error): in
Section 1A".
Go to Step 5.
Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.
S5JB0E3314027
No
Go to "4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)".
Go to Step 3.
Go to Step 4.
NO
Intermittent
trouble. Check for
intermittent referring to
"Intermittent and Poor
Connection Inspection:
in Section 00 in related
manual".
Repair circuit.
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Table of Contents
Troubleshooting
