Suzuki Grand Vitara JB627. Service manual - part 155

3C-24 Transfer: 

4WD Control Symptom Diagnosis

S6JB0B3304011

Diagnose transfer assembly after performing the following inspections.

1) Perform 4WD control system check referring to “4WD Control System Check”.
2) Confirm 4WD control system operation referring to “4WD Control System Operation”

Condition

Possible cause

Correction / Reference Item

Transfer does not operate 
(Transfer position 
indicator does not 
operate)

Transfer switch faulty

Check switch referring to “Transfer Switch 
Inspection”.

Transfer shift actuator faulty

Check transfer shift actuator referring to 
“Transfer Assembly Inspection”.

4L/N switch and/or switch center 
differential lock switch faulty

Check switch referring to “Transfer Assembly 
Inspection”.

Transmission range sensor (“N” range) 
faulty (for A/T model)

Adjust or check transmission range sensor 
referring to “Transmission Range Sensor 
Inspection and Adjustment in Section 5A”.

CPP switch faulty (for M/T model)

Check CPP switch referring to “Clutch Pedal 
Position (CPP) Switch Inspection and 
Adjustment in Section 5C”.

Wiring or grounding faulty

Repair as necessary.

4WD control module faulty

Check 4WD control module referring to 
“Inspection of 4WD Control Module and Its 
Circuits”.

Transfer refuses to 
operate (Transfer position 
indicator flashes, and 
then transfer does not 
shift)

Transfer shift actuator faulty

Check transfer shift actuator referring to 
“Transfer Assembly Inspection”.

4L/N switch and/or center differential 
lock switch faulty

Check switch referring to “Transfer Assembly 
Inspection”.

Distorted control cover shift shaft or shift 
fork

Check shift fork referring to “Transfer Assembly 
Inspection”.

Weakened control cover shift shaft 
spring

Check spring referring to “Transfer Assembly 
Inspection”.

Distorted or dispositioned control cover 
shift shaft snap ring and washer

Check snap ring and washer referring to 
“Transfer Assembly Inspection”.

Worn chamfered tooth on sleeve or gear Check chamfered tooth and gear referring to 

“Transfer Assembly Inspection”.

Wiring or grounding faulty

Repair as necessary.

4WD control module faulty

Check 4WD control module referring to 
“Inspection of 4WD Control Module and Its 
Circuits”.

Gear slipping out of mesh Worn control cover shift shaft

Check control cover shift shaft referring to 
“Transfer Assembly Inspection”.

Worn shift fork or sleeve

Check shift fork or sleeve referring to “Transfer 
Assembly Inspection”.

Weak or damaged control cover shift 
shaft spring

Check spring referring to “Transfer Assembly 
Inspection”.

Worn bearings on input gear or counter 
gear

Check bearing referring to “Transfer Assembly 
Inspection”.

Worn chamfered tooth on sleeve or gear Check sleeve and gear referring to “Transfer 

Assembly Inspection”.

Missing or disengagement of circlip(s)

Check circlip(s) referring to “Transfer Assembly 
Inspection”.

Noise

Damaged or worn bearing(s)

Refer to “Transfer Assembly Inspection”.

Damaged or worn gear(s)

Refer to “Transfer Assembly Inspection”.

Damaged or worn chamfered tooth on 
sleeve or gear

Refer to “Transfer Assembly Inspection”.

Transfer: 3C-25

Transfer Position Indicator Does Not Come ON at Ignition Switch ON but Engine Stops

S6JB0B3304012

Wiring Diagram

Circuit Description
Transfer position indicator operates according to the signal from 4WD control module. If the transfer control system is 
in good condition, transfer position indicator light up for 2 seconds when ignition switch is turned to ON position, and 
then turned to OFF position. If an abnormality is detected in the system, transfer position indicator remains lighting.

E91-22
E91-23

RED

WHT

RED

WHT

G28-10

G28-8

1

2

G28-13

PPL/RED

BLK

WHT/GRN

BLK/YEL

8

G28-15

4

6

7

5

3

1

2

3

4

5

6

7

8

9

10

11

17

1615141312

2221201918

[B]

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

[A]

I5JB0A332015-03

[A]: 4WD control module connector “E91” (viewed from harness side)

4. 4L indicator

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

5. N indicator

1. 4WD control module

6. Junction block assembly

2. Combination meter

7. “METER” fuse

3. Differential lock indicator

8. Ignition switch

3C-26 Transfer: 

Troubleshooting

Step

Action

Yes

No

1

Transfer position indicator power supply check
1) Turn ignition switch to ON position.

Do other indicators come ON?

Go to Step 2.

Go to Step 3.

2

Check DTC
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch to ON position and check DTC.

Is there DTC(s) U1073, U1100, U1101 and/or U1121?

Go to applicable DTC 
diag. flow.

Substitute a known-
good combination meter 
and recheck. If transfer 
position indicator still 
remains off, substitute a 
known-good 4WD 
control module and 
recheck.

3

CAN communication circuit check
1) Check CAN communication circuit between combination 

meter and 4WD control module referring to “DTC U1073: 
Control Module Communication Bus Off”.

Is CAN communication circuit in good condition?

Go to Step 4.

Repair or replace.

4

“METER” fuse check
1) Turn ignition switch to OFF position.
2) Check for fuse blown to “METER” fuse in junction block 

assembly.

Is “METER” fuse in good condition?

Go to Step 5.

Replace “METER” fuse 
and check for short.

5

Combination meter power supply check
1) Remove combination meter referring to “Combination 

Meter Removal and Installation in Section 9C”.

2) Check proper connection to combination meter 

connector at “G28-13” and “G28-15” terminals.

3) If OK, then turn ignition switch to ON position and 

measure voltage between combination meter connector 
at “G28-13” terminal and vehicle body ground.

Is it 10 – 14 V?

Go to Step 6.

“PPL/RED” wire is open 
circuit.

6

Combination meter ground circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between combination meter 

connector at “G28-15” terminal and vehicle body ground.

Is resistance 1 

Ω

 or less?

Substitute a known-
good combination meter 
and recheck. If transfer 
position indicator still 
remains OFF, substitute 
a known-good 4WD 
control module and 
recheck.

“BLK” wire is open or 
high resistance circuit.

Transfer: 3C-27

Transfer Position Indicator Remains ON Steady at Ignition Switch ON

S6JB0B3304013

Wiring Diagram

Circuit Description
Transfer position indicator operates according to the signal from 4WD control module. If the transfer control system is 
in good condition, transfer position indicator light up for 2 seconds when ignition switch is turned to ON position, and 
then turned to OFF position. If an abnormality is detected in the system, transfer position indicator remains lighting.

Troubleshooting

E91-22
E91-23

RED

WHT

RED

WHT

G28-10

G28-8

1

2

G28-13

PPL/RED

BLK

WHT/GRN

BLK/YEL

8

G28-15

4

6

7

5

3

1

2

3

4

5

6

7

8

9

10

11

17

1615141312

2221201918

[B]

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

[A]

I5JB0A332015-03

[A]: 4WD control module connector “E91” (viewed from harness side)

4. 4L indicator

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

5. N indicator

1. 4WD control module

6. Junction block assembly

2. Combination meter

7. “METER” fuse

3. Differential lock indicator

8. Ignition switch

Step

Action

Yes

No

1

Check DTC
1) Check DTC referring to “DTC Check”.

Is there any DTC(s)?

Perform DTC flow to 
repair and retry.

Go to Step 2.

2

CAN communication circuit check
1) Check CAN communication circuit between combination 

meter and 4WD control module referring to “DTC U1073: 
Control Module Communication Bus Off”.

Is CAN communication circuit in good condition?

Substitute a known-
good combination meter 
and recheck. If transfer 
position indicator still 
remains off, substitute a 
known-good 4WD 
control module and 
recheck.

Repair or replace.