Dtc U1121: Lost Communication With Abs / Electronic Stability Program Hydraulic Unit / Control Module - Suzuki GRAND VITARA 2005 Service Manual

3C-11 Transfer:
DTC U1121: Lost Communication with ABS / Electronic Stability Program Hydraulic Unit / Control
Module
Wiring Diagram
Refer to "DTC U1073: Control Module Communication Buss Off: ".
DTC Detecting Condition and Trouble Area
DTC detecting condition
Reception error of communication data for ABS / ESP®
hydraulic unit / control module 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 ABS or ESP® hydraulic unit / control
module.
Is DTC PU1073 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
• ABS / ESP® hydraulic unit / control module
• 4WD control module
Yes
Go to Step 2.
Go to "DTC U1073:
Control Module
Communication Buss
Off: ".
Go to "DTC U1073:
Control Module
Communication Bus
Off: in Section 4E" or
"DTC U1073: Control
Module Communication
Bus Off: in Section 4F".
Go to Step 5.
Check ABS or ESP®
hydraulic unit / control
module power and
ground circuit. If circuit
is OK, substitute a
known-good ABS or
ESP® hydraulic unit /
control module and
recheck.
S5JB0B3304029
No
Go to "4WD Control
System Check: in
related manual".
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.