Suzuki Grand Vitara JB627. Manual — part 200

4F-39 Electronic Stability Program:

DTC U1126: Lost Communication with Steering Angle Sensor (Reception Error)

S6JB0B4604043

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

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

9

DTC check for ESP

®

1) Connect connectors of disconnected control modules

communicating by means of CAN.

2) Disconnect each connector.

• ECM
• TCM
• BCM
• 4WD control module (if equipped)
• Keyless start control module (if equipped)
• Steering angle sensor

3) Check DTC for ESP

®.

Is DTC U1101 detected?

Check ESP

® control

module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP

®

hydraulic unit / control
module assembly and
check DTC.

Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and check DTC.

Step

Action

Yes

No

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”.

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.

Electronic Stability Program: 4F-40

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

S6JB0B4604044

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

DTC Detecting Condition and Trouble Area

5

DTC check for ESP

®

1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules

communicating by means of CAN.

3) Connect connectors to ESP

® control module and

steering angle sensor.

4) Check DTC for ESP

®.

Is DTC U1126 detected?

Go to Step 6.

Go to Step 7.

6

Check steering angle sensor
1) Turn ignition switch to OFF position.
2) Check steering angle sensor power and ground circuit.
3) If OK, then substitute a known-good steering angle

sensor.

4) Connect connectors of disconnected control modules

communicating by means of CAN.

5) Calibrate steering angle sensor referring to “Sensor

Calibration”.

6) Clear all DTC(s) and check DTC for ESP

®.

Is DTC U1126 detected?

Check ESP

® power

and ground circuit. If
circuit is OK, substitute
a known-good ESP

®

hydraulic unit / control
module assembly and
check DTC.

Steering angle sensor
was malfunction.

7

CAN communication circuit check
1) Turn ignition switch to OFF position.

Is each CAN communication circuit between disconnected
control modules (other than ESP

®

control module and

steering angle sensor) opened, shorted or high resistance?

Repair or replace the
CAN communication
line.

Go to Step 8.

8

DTC check for ESP

®

1) Connect connectors of disconnected control modules

communicating by means of CAN.

2) Disconnect each connector.

• ECM
• TCM (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
check DTC.

Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and check DTC.

Step

Action

Yes

No

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

4F-41 Electronic Stability Program:

DTC Troubleshooting

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
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”.

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

DTC check for ESP

®

1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules

communicating by means of CAN.

3) Connect connectors to ESP

® control module and 4WD

control module.

4) Check DTC for ESP

®.

Is DTC U1139 detected?

Go to Step 7.

Go to Step 8.

7

Check 4WD control module
1) Turn ignition switch to OFF position.
2) Check 4WD control module power and ground circuit.
3) If OK, then substitute a known-good 4WD control

module.

4) Connect connectors of disconnected control modules

communicating by means of CAN.

5) Clear all DTC(s) and check DTC for ESP

®.

Is DTC U1139 detected?

Check ESP

® power

and ground circuit. If
circuit is OK, substitute
a known-good ESP

®

hydraulic unit / control
module assembly and
check DTC.

4WD control module
was malfunction.

8

CAN communication circuit check
1) Turn ignition switch to OFF position.

Is each CAN communication circuit between disconnected
control modules (other than ESP

®

control module and 4WD

control module) opened, shorted or high resistance?

Repair or replace the
CAN communication
line.

Go to Step 9.

Electronic Stability Program: 4F-42

DTC U1140: Lost Communication with BCM (Reception Error)

S6JB0B4604045

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

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

9

DTC check for ESP

®

1) Connect connectors of disconnected control modules

communicating by means of CAN.

2) Disconnect each connector.

• ECM
• TCM (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
check DTC.

Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and check DTC.

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”.

5

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

® control module, BCM

and ECM communicating by means of CAN.

Is each CAN communication circuit between ESP

®

control

module, BCM and ECM opened, shorted or high resistance?

Repair or replace the
CAN communication
line.

Go to Step 6.