2006 SUZUKI SX4 fuel pressure

Downloaded from www.Manualslib.com manuals search engine 1A-120 Engine General Information and Diagnosis:
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 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 °C (14 °F) to 80 °C (176 °F)
• Intake air temperature: –10 °C (14 °F) to 70 °C (158 °F)
• Engine coolant temperature: 70 °C (158 °F) or more
• Altitude (barometric pressure): 2500 m, 8200 ft or less (560 mmHg, 74.4 kPa or more)

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) Run engine at idle for 10 min.
5) Drive vehicle and increase engine speed 3000 rpm in 3rd gear or “3” range.
6) Release accelerator pedal and with engine brake applied, keep vehicle coasting for 5 sec. or more. (Keep fuel cut
condition for 5 sec. or more) If fuel cut condition is not kept for 5 sec. or more, coast down a slope in engine speed
1000 – 3000 rpm for 5 sec. or more.
7) Stop vehicle and run engine at idle.
8) For european market model, check whether EGR system 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 7).
9) Check DTC and pending DTC.DTC detecting condition Trouble area
DTC P0401:
Difference in intake manifold absolute pressure between opened EGR valve and closed
EGR valve is smaller than specified value.
(2 driving cycle detection logic, monitoring once / 1 driving)
DTC P0402:
Difference in intake manifold absolute pressure between opened EGR valve and closed
EGR valve is larger than specified value.
(2 driving cycle detection logic, monitoring once / 1 driving)• EGR valve
• EGR passage
• MAP sensor
•ECM

Downloaded from www.Manualslib.com manuals search engine 1A-174 Engine General Information and Diagnosis:
C01-10 WHTOxygen signal of
heated oxygen
sensor-10 – 1 V Ignition switch turned ON.
— *Deflects between
over 0.5 V and under
0.45 V
(“Reference
waveform No.8: ” and
“Reference waveform
No.9: ”)While engine running at
2,000 r/min. for 1 min. or
longer after warmed up.
C01-11 BRNOxygen signal of
heated oxygen
sensor-2 (if
equipped)4 – 5 V Ignition switch turned ON.
— *Deflects between
over 0.5 V and under
0.45 V
(“Reference
waveform No.10: ”)While engine running at
2,000 r/min. or more after
vehicle running over 30
km/h, 19 mph for 5 min.
C01-12 WHTCAN (low)
communication line
(active low signal)
to TCM (for A/T
model)*0.5 – 2.5 V
(“Reference
waveform No.23: ”)
Ignition switch turned ON
with engine stop.CAN communication line
signal is pulse. Pulse
signal displayed with a
regular frequency which
varies depending on
engine condition. C01-13 REDCAN (high)
communication line
(active high signal)
to TCM (for A/T
model)*2.5 – 4.5 V
(“Reference
waveform No.23: ”)
C01-14GRY/
REDOutput of 5 V
power source for
MAP sensor and A/
C refrigerant
pressure sensor (if
equipped with A/C)4.5 – 5.5 V Ignition switch turned ON. —
C01-15 BLK Ground for ECM Below 0.3 V Ignition switch turned ON. —
C01-16BLU/
REDFuel injector No.3
output10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑↓
10 – 14 V
(“Reference
waveform No.1: ” and
“Reference waveform
No.11: ”)Engine running at idle
after warmed up engine.Output signal is active low
pulse. Pulse frequency
varies depending on
engine speed.
C01-17BLU/
ORNFuel injector No.4
output10 – 14 V Ignition switch turned ON. —
*0 – 0.6 V
↑↓
10 – 14 V
(“Reference
waveform No.1: ” and
“Reference waveform
No.12: ”)Engine running at idle
after warmed up engine.Output signal is active low
pulse. Pulse frequency
varies depending on
engine speed.
C01-18BRN/
YELEGR valve
(stepper motor coil
4) output (if
equipped)10 – 14 V Ignition switch turned ON. —
*0 – 1 V
↑↓
10 – 14 V
(“Reference
waveform No.4: ”)Ignition switch is turned to
ST (cranking) position.Output signal is active low
duty pulse. Number of
pulse generated times
varies depending on
vehicle condition. Terminal
No.Wire
colorCircuit Normal voltage Condition Remarks

Downloaded from www.Manualslib.com manuals search engine 1A-196 Engine General Information and Diagnosis:
Fuel Injector Circuit CheckS6RW0D1104074
Wiring Diagram11Sensor power source circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Turn ON ignition switch, measure each voltage between
“C01-14”, “E01-35”, “E01-34” and “C01-43” terminal of
ECM connector and vehicle body ground.
Is each voltage 4 – 6 V?ECM power and ground
circuit is in good
condition.Go to Step 12.
12Sensor power source circuit check
1) Disconnect connectors from ECM, TP sensor, MAP
sensor, A/C refrigerant pressure sensor (if equipped with
A/C) and APP sensor with ignition switch turned OFF.
2) Measure each resistance between “C01-14”, “E01-35”,
“E01-34” and “C01-43” terminal of ECM connector and
vehicle body ground.
Is each resistance infinity?Check internal short
circuit of TP sensor,
MAP sensor, A/C
refrigerant pressure
sensor (if equipped with
A/C) and/or APP
sensor.“GRY/RED”, “BRN” and/
or “RED” wire is shorted
to ground circuit. Step Action Yes No
BLK/WHT
BLK/RED
BLK/RED
WHTBLK/YELBLK/YEL
BLK/YEL
GRN
BRN/WHT
12V5V
9
2 83E01-29
E01-1
E01-60
10 11
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
C01-1
C01-2
C01-16
C01-17
BLK/REDBLK/RED
BLU/YEL
BLU/RED
BLU/ORN
BLU/WHT
E01-16
4
5
6
71
C01-58
C01-15 C01-30
BLK/ORN
BLKBLKBLKE01-31
I6RW0D110053-01
1. Main fuse box 4. No.1 injector 7. No.4 injector 10. “FI” fuse
2. Main relay 5. No.2 injector 8. “IG COIL” fuse 11. “IGN” fuse
3. ECM 6. No.3 injector 9. Ignition switch

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-201
Fuel Pressure CheckS6RW0D1104076
System Diagram
Special tool
(A): 09912–58442
(B): 09912–58432
(C): 09912–58490
Troubleshooting
NOTE
Before using following flow, check to make sure that battery voltage is higher than 11 V. If battery
voltage is low, pressure becomes lower than specification even if fuel pump and line are in good
condition.

I3RM0A110081-01
1. Injector 2. Delivery pipe 3. Fuel filter and fuel pump
Step Action Yes No
1Fuel pressure check
1) Check fuel pressure referring to “Fuel Pressure
Inspection in Section 1G”.
Is check result satisfactory?Go to Step 2. Go to Step 5.
2Fuel pressure check
1) Start engine and warm it up to normal operating
temperature.
2) Keep engine speed at 4000 rpm.
Does fuel pressure show about the same value as Step 1?Go to Step 3. Go to Step 8.
3Fuel line check
1) Check fuel pipe, fuel hose and joint for fuel leakage.
Are they in good condition?Go to Step 4. Repair or replace
defective part.

Downloaded from www.Manualslib.com manuals search engine 1A-202 Engine General Information and Diagnosis:
A/C Condenser Cooling Fan Control System InspectionS6RW0D1104077
Wiring Diagram4Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or
deform.
Are they in good condition?Faulty fuel pressure
regulator.Repair or replace
damaged or damaged
part.
5Was fuel pressure higher than specification in Step 1?Go to Step 6. Go to Step 7.
6Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or
deform.
Are they in good condition?Faulty fuel pressure
regulator.Repair or replace
damaged or damaged
part.
7Fuel pump operating sound check
1) Remove fuel filler cap and then turn ON ignition switch.
Can you hear operating sound?Go to Step 8. Faulty fuel pump.
8Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or
deform.
Are they in good condition?Clogged fuel filter, faulty
fuel pump, faulty fuel
pressure regulator or
fuel leakage from hose
connection in fuel tank.Repair or replace
defective part. Step Action Yes No
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
BLK/WHT
WHT
1
GRN
27
E01-29
10
89
REDBLK
3
5BLK/WHT
RED/BLKE01-58
WHT
4E01-47 GRY
BLU/YEL
6
C01-58
C01-15 C01-30
BLK/ORN
BLKBLKE01-31BLK
I6RW0D110055-01
1. Individual circuit fuse box No.1 5. A/C condenser cooling fan motor 9. “A/C” fuse
2. Ignition switch 6. A/C compressor 10. “IG COIL” fuse
3. A/C condenser cooling fan relay 7. ECM
4. A/C compressor relay 8. “FI” fuse

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-213
1) Connect SUZUKI scan tool to DLC (1) with ignition
switch turned OFF.
Special tool
(A): SUZUKI scan tool (SUZUKI-SDT)2) Warm up engine to normal operating temperature.
3) Check engine idle speed and “IAC throttle opening”
by using “Data List” mode on scan tool to check “IAC
throttle opening”.
4) If check result is out of specification, inspect electric
throttle body assembly referring to “Electric Throttle
Body Assembly On-Vehicle Inspection in Section
1C”.
Engine idle speed
A/C OFF: 700 ± 50 rpm (IAC duty: 5 – 25%)
A/C ON: 750 ± 50 rpm
5) Check that specified engine idle speed is obtained
with A/C turned ON if vehicle is equipped with A/C.
If not, check A/C system referring to “A/C System
Circuits Check”.
Special Tools and Equipment
Special ToolS6RW0D1108001
(A) 1I5RW0C110011-01
09912–58432 09912–58442
Fuel pressure gauge hose Fuel pressure gauge
This tool is included in fuel
pressure gauge set (09912-
58413). )This tool is included in fuel
pressure gauge set (09912-
58413). )
09912–58490 09933–06320
3-way joint & hose ECM check harness (120P)
)) / )
SUZUKI scan tool (SUZUKI-
SDT)
—
This kit includes following
items. 1. SUZUKI-SDT 2.
DLC3 cable 3. USB cable 4.
AC/DC power supply 5.
Voltage meter probe 6.
Storage case ) / )
1
2
34
56

Downloaded from www.Manualslib.com manuals search engine Engine Mechanical: 1D-3
Camshaft Position Control (VVT Variable Valve Timing) System DescriptionS6RW0D1401002
System Description
The VVT system is an electronic control system which continuously vary and optimize the intake valve timing in
response to the engine operating condition.
The optimized intake valve timing produce such an air intake with high efficiency that both the higher power generation
and lower fuel consumption can be attained in the whole engine speed range from low to high. In the area of the
average engine load, low emission of nitrogen oxides (NOx) and high fuel efficiency can also be attained by making
the valve opening overlap between the intake and exhaust valves longer.
For the brief of the system operation, the intake valve timing is varied by the cam timing sprocket (1) which varies the
rotational phase between the intake camshaft (3) and sprocket. The rotor (2) in the cam timing sprocket is actuated by
switching or adjusting the hydraulic pressure applied to the chambers for the timing advancing (7) and/or retarding (6).
To switch or adjust the hydraulic pressure appropriately, ECM operates the oil control valve (12) with detecting the
engine speed, intake air value, throttle opening, engine coolant temperature and camshaft position (angle).
1
4
5
10
8
9
2
7
6
12
11
3
60˚ (variable angle)
Most retarded timing Most advanced timing
Exhaust valveIntake valve
Crank angle
Overlap of valves
Valve lift
I5RW0C140002-01
4. Oil passage to chamber for timing retarding 8. Oil filter 10. Oil pan
5. Oil passage to chamber for timing advancing 9. Oil pump 11. Control signal from ECM

Downloaded from www.Manualslib.com manuals search engine Engine Mechanical: 1D-5
Targeted Timing Varying Operation
Diagnostic Information and Procedures
Compression CheckS6RW0D1404001
Check compression pressure on all 4 cylinders as
follows:
1) Warm up engine to normal operating temperature.
2) Stop engine after warming up.
NOTE
After warming up engine, place transmission
gear shift lever in “Neutral” (shift selector
lever to “P” range for A/T model), and set
parking brake and block drive wheels.

3) Remove air cleaner assembly with air suction hose
referring to “Air Cleaner Assembly Removal and
Installation”.
4) Remove cylinder head upper cover.
5) Remove ignition coil assemblies and all spark plugs
referring to “Spark Plug Removal and Installation in
Section 1H”.
6) Disconnect fuel injector wires at the coupler.7) Install special tools (Compression gauge) into spark
plug hole.
Special tool
(A): 09915–64512
(B): 09915–64530
(C): 09915–67010 Driving condition Valve timing Target of control Effect
Engine running at idle
speedMost retardedTo shorten the valve opening overlap in
order to prevent the exhaust gas
counterflow to intake manifold.Stabilization of the engine
rotation at idle speed.
Average engine load
rangeTo the advanced
sideTo lengthen the valve opening overlap
in order to enhance the internal
exhaust gas recirculation and reduce
the pumping loss.Improvement of the fuel
efficiency.
Lowering of the exhaust
emission.
Light engine load
rangeTo the retarded sideTo shorten the valve opening overlap in
order to prevent the exhaust gas
counterflow to intake manifold.Keeping of the engine stability.
Low or average
engine speed range
with heavy engine
loadTo the advanced
sideTo advance the closing timing of the
intake valve in order to improve the
volumetric efficiency.Improvement of generating the
engine torque at low and
average engine speed.
High engine speed
range with heavy
engine loadTo the retarded sideTo retard the closing timing of the
intake valve in order to improve the
volumetric efficiency.Improvement of generating the
engine power.
Low engine coolant
temperatureMost retardedTo shorten the valve opening overlap in
order to prevent the exhaust gas
counterflow to intake manifold and
reduce the fuel increasing.
To slow the fast idle speed of the
engine as a result of stabilizing the
engine idling.Stabilization of the fast idling of
the engine.
Improvement of the fuel
efficiency.
At engine starting and
stoppingMost retardedTo shorten the valve opening overlap in
order to prevent the exhaust gas
counterflow to intake manifold.Improvement of start ability.
(A)
(C)
(B)
I3RH0B140009-01