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

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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

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5

6

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1110

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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).