2006 SUZUKI SX4 O2S

Downloaded from www.Manualslib.com manuals search engine 1A-124 Engine General Information and Diagnosis:
DTC P0420: Catalyst System Efficiency below ThresholdS6RW0D1104045
System and Wiring Diagram
Circuit Description
ECM monitors oxygen concentration in the exhaust gas which has passed the warm up three way catalytic converter
by HO2S-2. When the catalyst is functioning properly, the variation cycle of HO2S-2 output voltage (oxygen
concentration) is slower than that of HO2S-1 output voltage because of the amount of oxygen in the exhaust gas
which has been stored in warm up three way catalytic converter.
DTC Detecting Condition and Trouble Area
C01-11
C01-10
C01-57
WHT
BRN
1
32
4
5 VORNORN
BLUWHTBLUWHT5
E01C01
3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238 3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238
I6RW0D110038-01
1. HO2S-1 3. Warm up three way catalytic converter 5. ECM
2. HO2S-2 4. Three way catalytic converter
DTC detecting condition Trouble area
• While vehicle running at constant speed under other than high load.
• Time from rich or lean switching command is output till HO2S-2
output voltage crosses 0.45 V is less than specified value.
(2 driving cycle detection logic, monitoring once / 1 driving)• Exhaust gas leak
• Warm up three way catalytic converter
malfunction
• HO2S-2 malfunction
• HO2S-1 malfunction

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-125
DTC Confirmation Procedure
WARNING!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester, on a level road.

NOTE
Check to make sure that following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temperature at engine start: –10 (14 °F) to 80 °C (176 °F)
• Intake air temperature: –10 °C (14 °F) to 70 °C (158 °F)
• Engine coolant temp.: 70 °C, 158 °F or more
• Altitude (barometric pressure): 2500 m, 8200 ft or less (560 mmHg, 74.4 kPa or more)

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Increase vehicle speed to 40 – 50 mph, 60 – 80 km/h.
4) Keep above vehicle speed for 10 min. or more (Throttle valve opening is kept constant in this step).
5) Stop vehicle.
6) For european market model, check whether catalyst monitoring readiness/monitoring test has completed or not by
using scan tool.
If evaporative system readiness/monitoring test has not completed, check vehicle conditions (environmental) and
repeat Steps 3) through 5).
7) Check DTC and pending DTC.
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Exhaust system visual check
1) Check exhaust system for leaks, damage and loose
connection.
Is it in good condition?Go to Step 3. Repair or replace
defective part.
3HO2S-2 output voltage check
1) Check output voltage of HO2S-2 referring to “DTC
P0137 / P0138: O2 Sensor (HO2S) Circuit Low Voltage /
High Voltage (Sensor-2)”.
Is check result satisfactory?Replace exhaust
manifold (built in warm
up three way catalytic
converter) and exhaust
center pipe (built in
three way catalytic
converter).Check “BRN” and / or
“ORN” wires for open
and short, and
connections for poor
connection.
If wires and connections
are OK, replace HO2S-
2.

Downloaded from www.Manualslib.com manuals search engine 1A-192 Engine General Information and Diagnosis:
Resistance Check
1) Remove ECM from its bracket referring to “Engine Control Module (ECM) Removal and Installation in Section 1C”.
CAUTION!
Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).

2) Connect special tool to ECM connectors (1) securely.
NOTE
Do not connect the other connector of special tool to ECM.

Special tool
(A): 09933–06320
3) Check resistance between each pair of terminals of special tool connectors (1) as listed in the following table.
CAUTION!
• Be sure to connect ohmmeter probe from wire harness side of coupler.
• Be sure to turn OFF ignition switch for this check.
• Resistance in the following table represents that measured when parts temperature is 20 °C (68 °F).

1
(A)
2
3
I7RW01110032-02
Terminals Circuit Standard resistance Condition
C01-47 to E01-29 Heater of HO2S-2 4 – 15 Ω—
E01-46 to E01-1/16 Radiator cooling fan relay No.1 160 – 240 Ω—
E01-60 to E01-29 Main relay 160 – 240 ΩBattery disconnected and
ignition switch turned ON
E01-15 to E01-29 Fuel pump relay 160 – 240 Ω—
C01-16 to E01-1/16No.3 fuel injector
10.8 – 18.2 Ω—
C01-17 to E01-1/16No.4 fuel injector
C01-4 to E01-1/16EGR valve (stepping motor No.1 coil) (if
equipped)20 – 31 Ω—
C01-29 to E01-1/16 EVAP canister purge valve 28 – 35 Ω—
C01-2 to E01-1/16 No.2 fuel injector 10.8 – 18.2 Ω—
C01-3 to E01-1/16EGR valve (stepping motor No.2 coil) (if
equipped)
20 – 31 Ω— C01-18 to E01-1/16EGR valve (stepping motor No.4 coil) (if
equipped)
C01-19 to E01-1/16EGR valve (stepping motor No.3 coil) (if
equipped)
C01-46 to E01-29 Heater of HO2S-1 2 – 11 Ω—
C01-1 to E01-1/16 No.1 fuel injector 10.8 – 18.2 Ω—
E01-29 to E01-47 A/C compressor relay (if equipped with A/C) 160 – 240 Ω—
E01-58 to E01-1/16A/C condenser cooling fan relay
(if equipped with A/C)160 – 240 Ω—
C01-60 to C01-59 Oil control valve (for engine with VVT system) 6 – 15 Ω—
E01-45 to E01-1/16 Throttle actuator control relay 160 – 240 Ω—

Downloaded from www.Manualslib.com manuals search engine 1C-8 Engine Electrical Devices:
Heated Oxygen Sensor (HO2S-1 and HO2S-2)
Heater On-Vehicle Inspection (If Equipped)
S6RW0D1306010
1) Disconnect sensor connector.
2) Using ohmmeter, measure resistance between
terminals “V
B” and “GND” of sensor connector.
If found faulty, replace oxygen sensor.
NOTE
Temperature of sensor affects resistance
value largely. Make sure that sensor heater is
at correct temperature.

Resistance of oxygen sensor heater
HO2S-1: 5.0 – 6.4 Ω at 20 °C (68 °F)
HO2S-2: 11.7 – 14.5 Ω at 20 °C (68 °F)
Viewed from terminal side
3) Connect sensor connector securely.
Heated Oxygen Sensor (HO2S-1 and HO2S-2)
Removal and Installation (If Equipped)
S6RW0D1306011
Removal
WARNING!
To avoid danger of being burned, do not
touch exhaust system when system is hot.
Oxygen sensor removal should be performed
when system is cool.

1) Disconnect negative cable at battery.
2) Disconnect connector of heated oxygen sensor and
release its wire harness from clamps.
3) Perform following items before removing heated
oxygen sensor.
a) For HO2S-1, remove exhaust manifold referring
to “Exhaust Manifold Removal and Installation in
Section 1K”, if necessary.
b) For HO2S-2, hoist vehicle.
4) Remove heated oxygen sensor from exhaust pipe or
exhaust manifold.Installation
Reverse removal procedure noting the following.
• Tighten heated oxygen sensor (1) to specified torque.
Tightening torque
Heated oxygen sensor (a): 45 N·m (4.5 kgf-m,
32.5 lb-ft)
• Install exhaust manifold referring to “Exhaust Manifold
Removal and Installation in Section 1K”, if removed.
• Connect connector of heated oxygen sensor (1) and
clamp wire harness securely.
• After installing heated oxygen sensor, start engine
and check that no exhaust gas leakage exists.
[A]: HO2S-1 [B]: HO2S-2
I4RS0A130006-01
[A]: HO2S-1 [B]: HO2S-2
[A]
[B]
1, (a)
1, (a)
I3RM0A130007-01

Downloaded from www.Manualslib.com manuals search engine Engine Mechanical: 1D-17
Engine Assembly Removal and InstallationS6RW0D1406013
Removal
1) Relieve fuel pressure according to “Fuel Pressure
Relief Procedure in Section 1G”.
2) Disconnect negative and positive cable at battery.
3) Disconnect ECM connectors.
4) Remove battery and battery tray with ECM.
5) Remove right and left side engine under covers.
6) Remove A/C compressor belt by referring to
“Compressor Drive Belt Removal and Installation in
Section 7B” or “Compressor Drive Belt Removal and
Installation in Section 7B”.
7) Drain engine oil referring to “Engine Oil and Filter
Change in Section 0B”.
8) Drain transaxle oil referring to “Manual Transaxle Oil
Change in Section 5B” or “A/T Fluid Change in
Section 5A”.
9) Drain transfer oil referring to “Transfer Oil Change in
Section 3C”.
10) Drain coolant referring to “Cooling System Draining
in Section 1F”
11) Remove air cleaner assembly referring to “Air
Cleaner Assembly Removal and Installation”.
12) With hose connected, detach A/C compressor from
its bracket referring to “Compressor Assembly
Removal and Installation in Section 7B” or
“Compressor Assembly Removal and Installation in
Section 7B”.
CAUTION!
Suspend removed A/C compressor at a place
where no damage will be caused during
removal and installation of engine assembly.

13) Remove cylinder upper cover (1).14) Disconnect the following electric wires/connectors
and each clamps.
• TP sensor (1)
• MAP sensor (2)
• ECT sensor (3)
•EGR valve (4)
• CMP sensor (5)
• Ignition coil assembly (6)
• Injector (7)
•HO2S (8)
• Oil control valve (9) (for engine with VVT system)
• Engine oil pressure switch (10)
• CKP sensor (12)
• Knock sensor (13)
• Generator (14)
• Starting motor (15)
• Ground terminal (16) from cylinder block
• Battery ground cable (17) from transaxle
• Back-up light switch (18) (for M/T model)
• Torque sensor (19)
• P/S motor (20)
• Output shaft speed sensor (VSS) (29) (for A/T
model)
• Solenoid valve (30) (for A/T model)
• Transmission range sensor (31) (for A/T model)
• Input shaft speed sensor (32) (for A/T model)
15) Disconnect the following cables, and remove control
cable bracket (23)
• Gear select control cable (21) (for M/T model)
• Gear shift control cable (22) (for M/T model)
• A/T select cable (33) (for A/T model)
16) Disconnect the following hoses.
• Brake booster hose (24) from intake manifold
• Radiator inlet and outlet hoses (25) from radiator
• Heater inlet and outlet hoses (26) from heater
core
• Fuel feed hose (27) from fuel feed pipe
• Fuel vapor hose (11) from fuel vapor pipe
• Clutch hose (28) from transaxle (for M/T model)
• A/T fluid cooler hoses (for A/T model)
F: Vehicle forward 8. Engine front mounting bracket : 55 N⋅m (5.5 kgf-m, 40.0 lb-ft)
1. Engine right mounting bracket 9. Engine front mounting
: Be sure to direct yellow mark to forward.: 95 N⋅m (9.5 kgf-m, 69.0 lb-ft)
2. Engine right mounting 10. Transfer : 65 N⋅m (6.5 kgf-m, 47.0 lb-ft)
3. Engine left mounting bracket 11. Suspension frame : 25 N⋅m (2.5 kgf-m, 18.0 lb-ft)
1
I5RW0A140009-01

Downloaded from www.Manualslib.com manuals search engine Exhaust System: 1K-2
Repair Instructions
Exhaust System ComponentsS6RW0D1B06001
WARNING!
To avoid the danger of being burned, do not touch the exhaust system when the system is hot. Any
service on the exhaust system should be performed when the system is cool.

[A]
1
2
3
4
56
7
8
9
10
11
12
12
26
12
12
141515
16
26 12
17
18
18
19
19
20
21
23
22
24
25
(a)(c)
(c)
(d)
(e)
(b)
(a)
(b)(b)
(c)
(c)
(b)
(b)
14(b)
15(b)13
(e)
13
I5RW0C1B0001-01
[A]: Installing location of exhaust manifold bolt and nut. 11. Muffler 22. Exhaust pipe clamp bolt
1. Exhaust manifold gasket 12. Mounting No.1 23. Engine hook
2. Exhaust manifold 13. Heat insulator nut 24. HO2S-1 (connector color: black)
3. Exhaust manifold stiffener 14. Exhaust manifold bolt 25. Heat insulator
4. HO2S-2 (connector color: green) 15. Exhaust manifold nut 26. Mounting No.2
5. Exhaust pipe No.1 gasket 16. Exhaust No.1 pipe bolt : 45 N⋅m (4.5 kgf-m, 32.5 lb-ft)
6. No.1 seal ring 17. Exhaust manifold stiffener bolt : 50 N⋅m (5.0 kgf-m, 36.5 lb-ft)
7. No.2 seal ring 18. Exhaust No.2 pipe bolt : 43 N⋅m (4.3 kgf-m, 31.0 lb-ft)
8. Exhaust No.1 pipe 19. Exhaust center pipe bolt : 29 N⋅m (2.9 kgf-m, 21.0 lb-ft)
9. Exhaust No.2 pipe 20. Exhaust pipe No.2 gasket : 2 N⋅m (0.2 kgf-m, 1.5 lb-ft)

Downloaded from www.Manualslib.com manuals search engine 1K-3 Exhaust System:
Exhaust Manifold Removal and InstallationS6RW0D1B06002
Removal
WARNING!
To avoid danger of being burned, do not
service exhaust system while it is still hot.
Service should be performed after system
cools down.

1) Disconnect negative cable at battery.
2) Disconnect HO2S-1 connector (1) (connector color:
black) and HO2S-2 connector (2) (connector color:
green), and then detach it from its stay.
3) Remove exhaust manifold stiffener (1).
4) Remove HO2S-2 (3) from exhaust manifold and
exhaust No.1 pipe, if necessary.
5) Disconnect exhaust No.1 pipe (2) from exhaust
manifold.6) Remove exhaust manifold (1) and its gasket from
cylinder head.
Installation
1) Install new gasket to cylinder head. Then install
exhaust manifold.
Tighten manifold bolts (1) and nuts (2) to specified
torque.
Tightening torque
Exhaust manifold bolt (a): 50 N·m (5.0 kgf-m,
36.5 lb-ft)
Exhaust manifold nut (b): 50 N·m (5.0 kgf-m,
36.5 lb-ft)
NOTE
Be sure to install exhaust manifold bolts and
nuts to proper location as shown in figure.

10. Exhaust center pipe 21. Exhaust pipe clamp : Do not reuse.
2
1
I5RW0C1B0002-01
2 3
1
I5RW0A1B0003-01
1
I5RW0A1B0004-01
1,(a)2,(b)2,(b)
I5RW0A1B0005-01

Downloaded from www.Manualslib.com manuals search engine Exhaust System: 1K-4
2) Install new seal ring and connect exhaust No.1 pipe
(1) to exhaust manifold.
Tighten pipe fasteners to specified torque.
Tightening torque
Exhaust No.1 pipe bolt (a): 50 N·m (5.0 kgf-m,
36.5 lb-ft)
3) Install exhaust manifold stiffener (2).
Tighten exhaust manifold stiffener bolts to specified
torque.
Tightening torque
Exhaust manifold stiffener bolt (b): 50 N·m (5.0
kgf-m, 36.5 lb-ft)
4) Install new seal ring and connect exhaust No.1 pipe
(1) to exhaust No.2 pipe. Tighten pipe fasteners to
specified torque.
Tightening torque
Exhaust No.2 pipe bolt (c): 43 N·m (4.3 kgf-m,
31.0 lb-ft)
5) Install HO2S-2 (3) and tighten HO2S-2 bracket bolt
(4) referring to “Exhaust System Components”, if
removed.
NOTE
Be sure to identify HO2S-1 and HO2S-2 by its
connector color referring to “Exhaust System
Components”.

6) Connect HO2S-1 connector (1) (connector color:
black) and HO2S-2 connector (2) (connector color:
green), and then fit coupler to bracket securely.
7) Connect negative cable at battery.
8) Check exhaust system for exhaust gas leakage.
Exhaust Pipe and Muffler Removal and
Installation
S6RW0D1B06003
For replacement of exhaust pipe, be sure to hoist vehicle
and observe WARNING under “Exhaust System
Components” and the following.
CAUTION!
Exhaust manifold have three way catalytic
converter in it, it should not be exposed to
any impulse.
Be careful not to drop it or hit it against
something.

• Tighten bolts and nuts to specified torque when
reassembling. Refer to “Exhaust System
Components”.
• After installation, start engine and check each joint of
exhaust system for leakage.
1 (c)3 4
(a)
(b)
2
I5RW0A1B0006-01
2
1
I5RW0C1B0002-01