Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual — part 38

3C-47 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

DTC Detecting Condition and Trouble Area

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

[D]: ABS hydraulic unit / control module connector (viewed from terminal side)

4. Keyless start control module (if equipped)

[E]: Combination meter connector (viewed from harness side)

5. ECM

[F]: 4WD control module connector (viewed from harness side)

6. ABS hydraulic unit / control module (if equipped)

[G]: BCM connector (viewed from harness side)

7. Combination meter

[H]: DLC (viewed from harness side)

8. DLC

[I]: ESP

® hydraulic unit / control module connector (viewed from terminal side)

9. ESP

® hydraulic unit / control module (if equipped)

DTC detecting condition

Trouble area

Transmission error of communication data for 4WD control
module is detected more than 7 times at more than specified
error counts continuously.

• CAN communication circuit
• ECM
• BCM
• 4WD control module
• TCM
• Combination meter
• Keyless start control module (if equipped)
• ABS or ESP

® hydraulic unit / control module

Step

Action

Yes

No

1

Was “4WD control system check” performed?

Go to Step 2.

Go to “4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)”.

2

Control module connector check
1) Check connection of connectors of all control modules

communicating by means of CAN.

2) Recheck DTC in TCM.

Is DTC U1073 detected?

Go to Step 3.

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

3

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?

Go to Step 4.

Repair circuit.

4

Check DTC
1) Turn ignition switch to OFF position.
2) Disconnect each connector.

• ECM
• ABS or ESP

® hydraulic unit / control module

• BCM
• TCM (if equipped)
• Keyless start control module (if equipped)

3) Recheck DTC in 4WD control module.

Is DTC U1073 detected?

Check 4WD control
module power and
ground circuit. If circuits
are OK, substitute a
known-good 4WD
control module and
recheck.

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

Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-48

DTC U1100: Lost Communication with ECM

S5JB0E3314027

Wiring Diagram
Refer to “DTC U1073: Control Module Communication Bus Off: Motor-Shift Type (Transfer with Shift Actuator)”.

DTC Detecting Condition and Trouble Area

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

DTC detecting condition

Trouble area

Reception error of communication data for ECM is detected for
longer than specified time continuously.

• CAN communication circuit
• ABS or ESP

® hydraulic unit / control module

• ECM
• 4WD control module

Step

Action

Yes

No

1

Was “4WD control system check” performed?

Go to Step 2.

Go to “4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)”.

2

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

Is DTC U1100 and DTC U1073 detected together?

Go to “DTC U1073:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator)”.

Go to Step 3.

3

DTC check
1) Check DTC in ECM.

Is DTC P1674 detected?

Go to “DTC P1674:
CAN Communication
(Bus Off Error) in
Section 1A”.

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) Recheck in 4WD control module.

Is DTC U1100 detected?

Go to Step 5.

NO Intermittent
trouble. Check for
intermittent 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 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?

Check ECM power and
ground circuit. If circuit
is OK, substitute a
known-good ECM and
recheck.

Repair circuit.

3C-49 Transfer: Motor-Shift Type (Transfer with Shift Actuator)

DTC U1101: Lost Communication with TCM

S5JB0E3314028

Wiring Diagram
Refer to “DTC U1073: Control Module Communication Bus Off: Motor-Shift Type (Transfer with Shift Actuator)”.

DTC Detecting Condition and Trouble Area

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

DTC detecting condition

Trouble area

Reception error of communication data for TCM is detected for
longer than specified time continuously.

• CAN communication circuit
• TCM
• 4WD control module

Step

Action

Yes

No

1

Was “4WD control system check” performed?

Go to Step 2.

Go to “4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)”.

2

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

Is DTC U1100 and DTC U1073 detected together?

Go to “DTC U1073:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator)”.

Go to Step 3.

3

DTC check
1) Check DTC in TCM.

Is DTC P1774 detected?

Go to “DTC P1774:
CAN Communication
Bus Off in Section 5A”.

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) Recheck in 4WD control module.

Is DTC U1100 detected?

Go to Step 5.

Intermittent trouble.
Check for intermittent
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 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?

Check TCM power and
ground circuit. If circuit
is OK, substitute a
known-good TCM and
recheck.

Repair circuit.

Transfer: Motor-Shift Type (Transfer with Shift Actuator) 3C-50

DTC U1121: Lost Communication with ABS / Electronic Stability Program Hydraulic Unit / Control
Module

S5JB0E3314029

Wiring Diagram
Refer to “DTC U1073: Control Module Communication Bus Off: Motor-Shift Type (Transfer with Shift Actuator)”.

DTC Detecting Condition and Trouble Area

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

DTC detecting condition

Trouble area

Reception error of communication data for ABS or ESP

®

hydraulic unit / control module is detected for longer than
specified time continuously.

• CAN communication circuit
• ABS or ESP

® hydraulic unit / control module

• 4WD control module

Step

Action

Yes

No

1

Was “4WD control system check” performed?

Go to Step 2.

Go to “4WD Control
System Check: Motor-
Shift Type (Transfer with
Shift Actuator)”.

2

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

Is DTC U1100 and DTC U1073 detected together?

Go to “DTC U1073:
Control Module
Communication Bus
Off: Motor-Shift Type
(Transfer with Shift
Actuator)”.

Go to Step 3.

3

DTC check
1) Check DTC in ABS or ESP

® hydraulic unit / control

module.

Is DTC U1073 detected?

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

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) Recheck in 4WD control module.

Is DTC U1100 detected?

Go to Step 5.

Intermittent trouble.
Check for intermittent
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 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?

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.

Repair circuit.