Suzuki GRAND VITARA JB416, Service Manual

Page: 305 / 474

Electronic Stability Program: 4F-42
DTC U1126: Lost Communication with Steering Angle Sensor (Reception Error)
S5JB0E4604043
Wiring Diagram
Refer to “DTC U1101: Lost Communication with TCM (Reception Error): ”.
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC Detecting Condition Trouble Area
Steering angle sensor message data is missing from CAN
communication. • CAN communication circuit
• Steering angle sensor
• ESP
®
control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 DTC check for ESP
®
1) Check DTC for ESP
®
.
Is DTC U1126 and DTC U1073 detected together?
Go to “DTC U1073:
Control Module
Communication Bus
Off: in Section 4E” for
troubleshooting. Go to Step 3.
3 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 U1126 detected?
Go to Step 4. Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection:
in Section 00 in related
manual”.
4 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP
®
control module and
steering angle sensor communicating by means of CAN.
Is each CAN communication circuit between ESP
®
control
module and steering angle sensor opened, shorted or high
resistance?
Repair or replace the
CAN communication
line. Go to Step 5.
5 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 and
steering angle sensor) opened, shorted or high resistance?
Go to Step 6. Repair or replace the
CAN communication
line.
6 DTC check for ESP
®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector.
• ECM
• TCM (for A/T model)
• BCM
• 4WD control module (if equipped)
• Keyless start control module (if equipped)
• Steering angle sensor
3) Check DTC for ESP
®
.
Is DTC U1126 detected?
Check ESP
®
control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP
®
hydraulic unit / control
module assembly and
recheck.
Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.