Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual — part 72

4F-42 Electronic Stability Program:

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.

Electronic Stability Program: 4F-43

DTC U1139: Lost Communication with 4WD Control Module (Reception Error)

S5JB0E4604044

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

4WD control module message data is missing from CAN
communication. (if equipped 4WD control module)

• CAN communication circuit
• 4WD control module
• 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 U1139 and DTC U1073 detected together?

Go to “DTC U1073:
Control Module
Communication Bus Off
in Section 4E” for
troubleshooting.

Go to Step 3.

3

DTC check for 4WD control module
1) Check DTC for 4WD control module.

Is DTC P1073 detected?

Go to “DTC U1073:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator) in Section 3C”
for troubleshooting.

Go to Step 4.

4

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 U1139 detected?

Go to Step 4.

Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection
in Section 00 in related
manual”.

5

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP

® control module and

4WD control module communicating by means of CAN.

Is each CAN communication circuit between ESP

®

control

module and 4WD control module opened, shorted or high
resistance?

Repair or replace the
CAN communication
line.

Go to Step 6.

6

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 4WD

control module) opened, shorted or high resistance?

Go to Step 7.

Repair or replace the
CAN communication
line.

4F-44 Electronic Stability Program:

DTC U1140: Lost Communication with BCM (Reception Error)

S5JB0E4604045

Wiring Diagram
Refer to “DTC U1101: Lost Communication with TCM (Reception Error)”.

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

7

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
• Keyless start control module (if equipped)
• Steering angle sensor

3) Check DTC for ESP

®.

Is DTC U1139 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.

Step

Action

Yes

No

DTC Detecting Condition

Trouble Area

BCM message data is missing from CAN communication. • CAN communication circuit

• 4WD control module
• 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 U1140 and DTC U1073 detected together?

Go to “DTC U1073:
Control Module
Communication Bus Off
in Section 4E” for
troubleshooting.

Go to Step 3.

3

DTC check for BCM
1) Check DTC for BCM.

Is DTC U1073 detected?

Go to “DTC U1073 (No.
1073): Control Module
Communication Bus Off
in Section 10B” for
troubleshooting.

Go to Step 4.

4

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 U1140 detected?

Go to Step 4.

Check for intermittent
trouble referring to
“Intermittent and Poor
Connection Inspection
in Section 00 in related
manual”.

5

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP

® control module and

BCM communicating by means of CAN.

Is each CAN communication circuit between ESP

®

control

module and BCM opened, shorted or high resistance?

Repair or replace the
CAN communication
line.

Go to Step 6.

Electronic Stability Program: 4F-45

Repair Instructions

Hydraulic Unit Operation Check

S5JB0E4606001

Refer to “Hydraulic Unit Operation Check in Section 4E”.

Sensor Calibration

S5JB0E4606015

CAUTION

!

If any DTC(s) other than C1075, C1076, C1077
or C1078 are detected, sensor calibration can
not be completed. Repair the detected DTC
first.

NOTE
Steering angle sensor calibration is needed
when battery, dome fuse or the steering
angle sensor is removed.
This sensor calibration can be done with/
without SUZUKI Scan Tool.
When ESP

® control module and/or yaw rate /

G sensor assembly is removed, sensor
calibration is needed with SUZUKI Scan Tool.

Sensor Calibration (Using SUZUKI Scan Tool)

1) Set steering wheel in straight-ahead position.
2) Connect SUZUKI scan tool to data link connector

(DLC) (1) with ignition switch OFF.

Special tool
(A): SUZUKI scan tool

3) Turn ignition switch to ON position and confirm that

only any of DTC(s) C1075, C1076, C1077 and/or
C1078 is detected. If any other DTC are detected,
repair the detected DTC.

4) Park and level the vehicle with parking brake, stop

engine with ignition switch ON, set steering in
straight and without stepping on the brake pedal.

CAUTION

!

Hold the above condition in Step 4) to
calibrate sensor correctly until sensor
calibration is completed.

5) Select menu “SENSOR CALIBRATION” under

“MISC. TEST” mode of SUZUKI scan tool and
calibrate sensor. Refer to scan tool operator's
manual for further derails.

6

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 BCM)

opened, shorted or high resistance?

Go to Step 7.

Repair or replace the
CAN communication
line.

7

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 U1140 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.

Step

Action

Yes

No

(A)

1

I5JB0A450008-01