Suzuki GRAND VITARA JB416, Service Manual

Page: 435 / 474

Body Electrical Control System: 10B-15
DTC U1101 (No. 1101): Lost communication with TCM
S5JB0EA204015
Wiring Diagram
Refer to “DTC U1073 (No. 1073): Control Module Communication Bus Off: ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC.
DTC Troubleshooting
DTC detecting condition Trouble area
BCM can not receive CAN data from TCM (A/T
model) for longer than specified time
continuously. • CAN communication circuit
• BCM
• TCM (A/T model)
Step Action Yes No
1 DTC check of BCM
Is DTC U1101 (No. 1101) and DTC U1073 (No. 1073)
detected together?
Go to “DTC U1073 (No.
1073): Control Module
Communication Bus
Off: ”. Go to Step 2.
2 DTC check of TCM
1) Check TCM for DTC.
Is DTC P1774 detected?
Go to “DTC P1774:
CAN Communication
Bus Off: in Section 5A”. Go to Step 3.
3 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck BCM for DTC.
Is DTC U1101 (No. 1101) detected?
Go to Step 4. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00 in related manual”.
4 CAN communication circuit check
1) Disconnect connectors from BCM and TCM.
2) Check CAN communication circuit for open, short and
high resistance.
• Between TCM and BCM
Is each CAN communication circuit in good condition?
Go to Step 5. Repair circuit.
5 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control
modules other than Step 4 for open, short and high
resistance.
Is each CAN communication circuit in good condition?
Go to Step 6. Repair circuit.
6 DTC check of ECM
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Check ECM for DTC.
Is DTC U1101 detected?
Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck. Go to Step7.