Suzuki Grand Vitara JB627. Manual — part 37

1A-97 Engine General Information and Diagnosis:

DTC P0153 / P2A03: O2 Sensor Circuit Slow Response / Performance (Sensor-1, Bank-2)

S6JB0B1104030

Wiring Diagram

A/F Sensor Description
Refer to “A/F Sensor Description”

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

WARNING

!

• When performing a road test, select a place where there is no traffic or possibility of a traffic

accident and very careful during testing to avoid occurrence of an accident.

• Road test should be carried out with 2 persons, a driver and a tester, on a level road.

4

3

9

PNK

6

2

1

8

5

BLK/WHT

BLK

PNK

GRN

C37-35

C37-78

C37-38

C37-37

BLK

BLK

BLU

WHT

C37-36

C37-79

BRN

YEL

BLU/YEL

BLU/RED

PNK/BLU

BLK/YEL

10

7

11

5 V

5 V

1

3 2

4

5

6

7

8

9

1110

12

13

14

15

16

17

18

19

20

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

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

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

d

a

b

c

I6JB01110095-01

a. Signal (+) circuit of A/F sensor (bank-2)

1. HO2S heater relay

5. IG COIL fuse

9. ECM

b. Signal (–) circuit of A/F sensor (bank-2)

2. Shield wire

6. A/F sensor

10. Adjusting resistor (if equipped)

c. Adjusting resistor (+) circuit of A/F sensor (bank-2)

3. Ignition Switch

7. A/F sensor heater

11. A/F sensor element

d. Adjusting resistor (–) circuit of A/F sensor (bank-2)

4. O2 HTR fuse

8. To A/F sensor (bank-1),

HO2S (bank-1 and -2)

DTC detecting condition

Trouble area

DTC P0153 O2 Sensor Circuit Slow Response (Sensor-1, Bank-2):
Number of shifting times for A/F sensor signal between rich and lean is less
than 13 times in 20 sec. while A/F (fuel trim) is shifted rich to lean and lean to
rich with specified diagnosis frequency under specified running.
(2 driving cycle detection logic, monitoring once per driving cycle)
DTC P2A03 O2 Sensor Circuit Performance (Sensor-1, Bank-2):
Amplitude index of A/F sensor signal between rich and lean is more than 1.3
or less than 0.7 while A/F (fuel trim) is shifted rich to lean and lean to rich with
specified diagnosis frequency under specified running.
(2 driving cycle detection logic, monitoring once per driving cycle)

• A/F sensor circuit
• A/F sensor
• ECM

Engine General Information and Diagnosis: 1A-98

NOTE
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temperature: –14

°C (7 °F) to 70 °C (158 °F).

• Engine coolant temperature: 40

°C (104 °F) or more.

• The following DTC is not detected (when DTC P0153 is detected): A/F sensor heater.

1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by 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 3 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 P0154?

Go to applicable DTC.

Go to Step 3.

3

DTC check

Is there DTC(s) other than P0153, P0134 and P2A03?

Go to applicable
DTC(s).

Go to Step 4.

4

Intake system and exhaust system for leakage check
1) Check intake system and exhaust system for leakage.

Is it in good condition?

Go to Step 5.

Repair or replace
defective parts.

5

A/F sensor circuit check
1) Disconnect connector from A/F sensor (bank-2) with

ignition switch turned OFF.

2) Check for proper terminal connection to A/F sensor

(bank-2) connector.

3) If connections are OK, check that A/F sensor circuit is as

follows.
• Wiring harness resistance of each “Signal (+) circuit of

A/F sensor (bank-2)”, “Signal (–) circuit of A/F sensor
(bank-2)”, “Adjusting resistor (+) circuit of A/F sensor
(bank-2)” and “Adjusting resistor (–) circuit of A/F
sensor (bank-2)” is less than 1

Ω.

Is it in good condition?

Replace A/F sensor
(bank-2).

Repair or replace
defective wiring
harness.

1A-99 Engine General Information and Diagnosis:

DTC P0154: O2 Sensor Circuit No Activity (Sensor-1, Bank-2)

S6JB0B1104031

Wiring Diagram

A/F Sensor Description
Refer to “A/F Sensor Description”

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool to DLC.
2) Turn ON ignition switch and clear DTC.
3) Start engine and warm up to normal operating temperature.
4) Run engine at idle speed for 1 min. or more.
5) Check DTC and pending DTC.

4

3

9

PNK

6

2

1

8

5

BLK/WHT

BLK

PNK

GRN

C37-35

C37-78

C37-38

C37-37

BLK

BLK

BLU

WHT

C37-36

C37-79

BRN

YEL

BLU/YEL

BLU/RED

PNK/BLU

BLK/YEL

10

7

11

5 V

5 V

1

3 2

4

5

6

7

8

9

1110

12

13

14

15

16

17

18

19

20

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

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

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

d

a

b

c

I6JB01110096-01

a. Signal (+) circuit of A/F sensor (bank-2)

1. HO2S heater relay

5. IG COIL fuse

9. ECM

b. Signal (–) circuit of A/F sensor (bank-2)

2. Shield wire

6. A/F sensor

10. Adjusting resistor (if

equipped)

c. Control circuit of A/F sensor (bank-2) heater

3. Ignition Switch

7. A/F sensor heater

11. A/F sensor element

d. Control ground circuit of A/F sensor (bank-2) heater

4. O2 HTR fuse

8. To A/F sensor (bank-1), HO2S

(bank-1 and -2) (if equipped)

DTC detecting condition

Trouble area

Impedance of A/F sensor element is higher than 67

Ω for more than 20 sec.

even though A/F sensor heater is turned ON for more than specified time
with engine running.
(2 driving cycle detection logic)

• A/F sensor circuit
• A/F sensor
• ECM

Engine General Information and Diagnosis: 1A-100

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

A/F sensor signal check
1) Connect scan tool with ignition switch turned OFF
2) Warm up engine to normal operating temperature and

keep it at 2000 r/min. for 60 sec.

3) Repeat racing engine (Repeat depressing accelerator

pedal 5 to 6 times continuously to enrich A/F mixture and
take foot off from pedal to enlean it).

4) Check for A/F sensor (bank-2) output current displayed

on scan tool.

Does A/F sensor output current between –0.2 mA and 0.2
mA?

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

Go to Step 3.

3

A/F sensor circuit check
1) Disconnect connector from A/F sensor (bank-2) with

ignition switch turned OFF.

2) Check for proper terminal connection to A/F sensor

(bank-2) connector.

3) If connections are OK, check that A/F sensor circuit is as

follows.
• Wiring harness resistance of each “Signal (+) circuit of

A/F sensor (bank-2)”, “Signal (–) circuit of A/F sensor
(bank-2)”, “Control circuit of A/F sensor (bank-2)
heater” and “Control ground circuit of A/F sensor
(bank-2) heater” is less than 1

Ω.

Are they in good condition?

Go to Step 4.

Repair or replace
defective wiring
harness.

4

A/F sensor heater check
1) Check heater resistance of A/F sensor (bank-2) referring

to “Air Fuel Ratio (A/F) Sensor On-Vehicle Inspection in
Section 1C”.

Is A/F sensor heater in good condition?

Substitute a known
good ECM and recheck.
If ECM OK, replace A/F
sensor (bank-2).

Repair A/F sensor
(bank-2).