Suzuki Grand Vitara JB627. Service manual - part 54

1A-165 Engine General Information and Diagnosis: 

DTC P2227/ P2228 / P2229: Barometric Pressure Circuit Malfunction

S6JB0B1104069

DTC P2227: Barometric Pressure Circuit Range / Performance
DTC P2228: Barometric Pressure Circuit Low
DTC P2229: Barometric Pressure Circuit High

System Description
Barometric pressure sensor is installed in ECM.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure
DTC P2227:

NOTE
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation 
Procedure”.
• Intake air temperature: between –10 

°C and 45 °C (14 °F and 113 °F)

• Engine coolant temperature: between –10 

°C and 110 °C (14 °F and 230 °F)

• The following DTCs are not detected: CMP sensor, TP sensor and IAC system

 

1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine.
4) Check DTC and pending DTC by using scan tool.

4

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 wire.

Step

Action

Yes

No

DTC detecting condition

Trouble area

DTC P2227: Barometric Pressure Circuit Range / Performance
Difference between measured barometric pressure and estimated 
barometric pressure based on MAP is more than 25.3 kPa at engine start.
(2 driving cycle detection logic, monitoring once per driving cycle)

• Barometric pressure sensor in ECM
• MAP sensor

DTC P2228: Barometric Pressure Circuit Low
Barometric pressure sensor voltage is less than 0.1 V for 19 seconds or 
longer.
(1 driving cycle detection logic)

• Barometric pressure sensor in ECM

DTC P2229: Barometric Pressure Circuit High
Barometric pressure sensor voltage is more than 5.1 V for 19 seconds or 
longer.
(1 driving cycle detection logic)

Engine General Information and Diagnosis:  1A-166

DTC P2228 / P2229:

1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and run it for 10 sec.
4) Check DTC and pending DTC by using scan tool.

DTC Troubleshooting

DTC P2237: O2 Sensor Positive Current Control Circuit / Open (Sensor-1, Bank-1)

S6JB0B1104070

System and Wiring Diagram

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

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

Is DTC P2227 set?

Go to Step 3.

Substitute a known 
good ECM and recheck.

3

MAP sensor check
1) Check MAP sensor and its circuit referring to “DTC 

P0107 / P0108: Manifold Absolute Pressure Sensor 
Circuit Low / High Input”.

Is check result satisfactory?

Substitute a known 
good ECM and recheck.

Repair or replace.

4

3

9

PNK

6

2

1

d

a

b

8

5

BLK/WHT

BLK

PNK

GRN

C37-16

C37-77

C37-19

C37-18

BLK

BLK

BLU

WHT

C37-17

C37-79

BLK

WHT

RED/YEL

RED/BLU

PNK/BLK

BLK/YEL

10

7

11

5 V

5 V

1

3 2

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5

6

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c

I6JB01110104-01

a. Signal (+) circuit of A/F sensor (bank-1)

1. HO2S heater relay

5. IG COIL fuse

9. ECM

b. Signal (–) circuit of A/F sensor (bank-1)

2. Shield wire

6. A/F sensor

10. Adjusting resistor (if equipped)

c. Control circuit of A/F sensor (bank-1) heater

3. Ignition Switch

7. A/F sensor heater

11. A/F sensor element

d. Control ground circuit of A/F sensor (bank-1) heater

4. O2 HTR fuse

8. To A/F sensor (bank-2), HO2S 

(bank-1 and -2) (if equipped)

1A-167 Engine General Information and Diagnosis: 

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

NOTE
Check to make sure that following conditions are satisfied when using this “DTC Confirmation 
Procedure”.
• The following DTC is not detected: A/F sensor heater

 

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.

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

Impedance of A/F sensor element is higher than 250 

Ω for more than 5 sec. 

even though A/F sensor heater is turned ON with engine running.
(1 driving cycle detection logic)

• A/F sensor circuit
• A/F sensor
• 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

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-1) 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-1) with 

ignition switch turned OFF.

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

(bank-1) connector and ECM connector.

3) If connections are OK, check that A/F sensor (bank-1) 

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

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

Ω.

Are they in good condition?

Go to Step 4.

Repair or replace 
defective wiring 
harness.

Engine General Information and Diagnosis:  1A-168

DTC P2238 / P2239: O2 Sensor Positive Current Control Circuit Low / High (Sensor-1, Bank-1)

S6JB0B1104071

Wiring Diagram
Refer to “DTC P2237: O2 Sensor Positive Current Control Circuit / Open (Sensor-1, Bank-1)”

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

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

NOTE
Check to make sure that following conditions are satisfied when using this “DTC Confirmation 
Procedure”.
• The following DTC is not detected: A/F sensor heater

 

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

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

Replace A/F sensor 
(bank-1).

Step

Action

Yes

No

DTC detecting condition

Trouble area

DTC P2238 O2 Sensor Positive Current Control Circuit Low 
(Sensor-1, Bank-1):
Circuit voltage of A/F sensor (+) terminal is lower than 0.4 V or 
A/F sensor circuit is short between (+) terminal wire and (–) 
terminal wire with engine running.
(1 driving cycle detection logic)
DTC P2239 O2 Sensor Positive Current Control Circuit High 
(Sensor-1, Bank-1):
Circuit voltage of A/F sensor (+) terminal is higher than 3.5 V 
with engine running
(1 driving cycle detection logic)

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