Suzuki Grand Vitara JB627. Manual - part 59

1A-185 Engine General Information and Diagnosis: 

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Drive vehicle at 40 mph (60 km/h) or higher. (engine speed: 2500 – 3000 r/min.)
5) Keep above vehicle speed for 6 min. or more. (Throttle valve opening is kept constant in this step.)
6) Release accelerator pedal and with engine brake applied, keep vehicle coasting (with fuel cut for 5 sec. or more) 

and then stop vehicle.

7) Check if DTC and pending DTC exist by using scan tool. If not, check if oxygen sensor monitoring test has been 

completed by using scan tool. If not in both of above checks (i.e., no DTC and pending DTC and oxygen sensor 
monitoring test not completed), check vehicle condition (environmental) and repeat Step 3) through 6).

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting”.

 

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check”.

2

DTC Check

Is there DTC P0160?

Go to applicable DTC.

Go to Step 3.

3

DTC check

Is there DTC(s) other than P0160 and P2A04?

Go to applicable 
DTC(s).

Go to Step 4.

4

Exhaust system for leakage check
1) Check exhaust system for leakage.

Is it in good condition?

Go to Step 5.

Repair or replace 
defective parts.

5

HO2S circuit check
1) Disconnect connectors from HO2S (bank-2) and ECM 

with ignition switch turned OFF.

2) Check for proper terminal connection to HO2S (bank-2) 

connector and ECM connector.

3) If connections are OK, check that HO2S (bank-2) circuit 

is as follows.
• Wiring harness resistance of each “Signal circuit of 

HO2S (bank-2)”, “Ground circuit of HO2S (bank-2)” 
and “Control circuit of HO2S (bank-2) heater” is less 
than 1 

Ω.

• Insulation resistance between “Signal circuit of HO2S 

(bank-2)” and vehicle body ground is infinity.

• Insulation resistance of wire harness is infinity 

between “Signal circuit of HO2S (bank-2)” terminal 
and each other terminal at HO2S (bank-2) connector.

• Circuit voltage between “Signal circuit of HO2S (bank-

2)” and vehicle body ground is 0 V with ignition switch 
turned ON.

Are they in good condition?

Replace HO2S (bank-
2).

Repair or replace 
defective wiring 
harness.

Engine General Information and Diagnosis:  1A-186

DTC U0073: Control Module Communication Bus Off

S6JB0B1104080

Wiring Diagram

WHT

RED

WHT

RED

G44-18

G44-19

G44

[A]

[B]

[C]

[H]

[G]

1

2

3

4

5

6

7

8

9

10

11

14

15

16
36

34 33 32

30 29

24 23

37

18

19

20

G28-8

G28-10

WHT/BLU

WHT/BLU

WHT/RED

WHT/RED E23-9

E23-17

WHT

RED

WHT

RED

E92-17

E92-7

WHT

RED

E91-22
E91-23

WHT

RED

RED

G31-1
G31-3

G31-4

6

5

16 15 14 13 12 11

4 3

24 23

21

22

10 9

8

7

2

1

19

20

18 17

E92

E23

1

2

3

4

5

6

7

8

9

10

11

17

1615141312

2221201918

G28

[F]

G31

E91

1

2

3

4

7

8

9

10

11

14

15

16
36

34

35

24 23

21

22

28 27

25

26

37

39 38

40

18 17

13 12

19

20

1

2

3

10

11

12

16

17

18

15 14 13

19

20

21

25

26

5

6

[I]

E53

[E]

E03

15
16
17
18
19
20
21
22
23
24
25

2
3
4
5
6
7
8
9

10
11
12

1

13

14

26

G31-2

WHT

1

2

3

4

9

5

6

8

7

[K]

E03-12

E03-10

E03-6

E03-8

10

11

[J]

E53-13

E53-42

E53-44

E53-46

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

33

34

35

36

37

38

39

40

32

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

[D]

8 7

6 5 4 3

2 1

9

10

11

12

13

14

15

16

16

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

[L]

G45

10 9

3 2 1

WHT

RED G45-9

G45-10

I6JB01110063-03

[A]: Keyless start control module connector (viewed from harness side)

1. BCM

[B]: ECM connector (viewed from harness side)

2. 4WD control module (if equipped)

[C]: TCM connector (viewed from harness side)

3. TCM (A/T model)

[D]: DLC connector (viewed from harness side)

4. Keyless start control module (if equipped)

[E]: ABS control module connector (viewed from harness side)

5. DLC

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

6. ECM

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

7. ABS control module

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

8. Combination meter

[I]: ESP

® control module connector (viewed from harness side)

9. Junction connector

[J]: ESP

® model

10. ESP

® control module

[K]: Non ESP

® model

11. Steering angle sensor (ESP

® model)

[L]: Steering angle sensor connector (viewed from harness side)

1A-187 Engine General Information and Diagnosis: 

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Clear DTC referring to “DTC Clearance” in this section.
2) Start engine and run it for 1 min. or more.
3) Check DTC referring to “DTC Check”.

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting”.

 

DTC detecting condition

Trouble area

Transmission error that is inconsistent between transmission 
data and transmission monitor (CAN bus monitor) data is 
detected more than 7 times continuously.
(1 driving cycle detection logic)

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

® control module

• TCM (A/T model)
• Steering angle sensor (ESP

® model)

• ECM

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check”.

2

DTC check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Check for all control modules (ECM, TCM (A/T model), 

BCM, ABS or ESP

® control module, 4WD control 

module (if equipped), keyless start control module (if 
equipped), combination meter) for DTC(s) other than 
CAN communication DTCs.

Is there any DTC(s) other than CAN communication DTC(s) 
at each control module (other than DTC U0073, U0100, 
U0101, U0121, U0140, U1073, U1100, U1101, U1121, 
U1126, U1139, U1140, U1144)?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

All control modules (ECM, TCM (A/T model), BCM, ABS 
or ESP

® control module, 4WD control module (if 

equipped), keyless start control module (if equipped), 
combination meter, steering angle sensor (ESP

® 

model)) connectors check
1) Check for proper connection at all control module (ECM, 

TCM (A/T model), BCM, ABS or ESP

® control module, 

4WD control module (if equipped), keyless start control 
module (if equipped), combination meter) connector 
terminals with ignition switch turned OFF.

2) If connections are OK, recheck ECM for DTC with 

engine running.

Is there DTC U0073?

Go to Step 4.

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

Engine General Information and Diagnosis:  1A-188

4

ECM power and ground circuit check
1) Check ECM power and ground circuit referring to “ECM 

Power and Ground Circuit Check”.

Are they in good condition?

Go to Step 5.

Repair ECM power and/
or ground circuits.

5

DTC check for all control modules which detected CAN 
communication DTC (ECM, TCM (A/T model), BCM, ABS 
or ESP

® control module, 4WD control module (if 

equipped))
1) Check for DTC(s) of all control modules which detected 

CAN communication DTC (ECM, TCM (A/T model), 
BCM, ABS or ESP

® control module, 4WD control 

module (if equipped)).

Is there DTC(s) U0073 or U1073 at each control module?

Go to Step 6.

Go to Step 7.

6

DTC check
1) Disconnect connectors from ECM with ignition switch 

turned OFF.

2) Check for DTC(s) of all control modules which detected 

CAN communication DTC (ECM, TCM (A/T model), 
BCM, ABS or ESP

® control module, 4WD control 

module (if equipped)).

Is there DTC(s) U0073 or U1073 at each control module?

Go to Step 7.

CAN communication 
circuit wire between 
ECM and ABS or ESP

® 

control module is open 
or high resistance. If 
wires are OK, substitute 
a known-good ECM and 
recheck.

7

DTC check
1) Connect connectors to ECM and disconnect connector 

from BCM with ignition switch turned OFF.

2) Check ECM for DTC(s).

Is there DTC U0073?

Go to Step 8.

CAN communication 
circuit wire between 
BCM and CAN circuit 
junction connector is 
open or high resistance. 
If wires are OK, check 
BCM power and ground 
circuits. If circuits are 
OK, substitute a known-
good BCM and recheck.

8

DTC check
1) Disconnect connectors from TCM (A/T model) with 

ignition switch turned OFF.

2) Check ECM for DTC.

Is there DTC U0073?

Go to Step 9.

CAN communication 
circuit wire between 
TCM and CAN circuit 
junction connector is 
open or high resistance. 
If wires are OK, check 
TCM power and ground 
circuits. If circuits are 
OK, substitute a known-
good TCM (A/T model) 
and recheck.

Step

Action

Yes

No