check engine NISSAN X-TRAIL 2003 Electronic Repair Manual

EM-20
[QR20DE]
INTAKE MANIFOLD
Tightening Intake Manifold collector bolts and nuts
lTighten in numerical order as shown in the figure.
NOTE:
No.6 means double tightening of bolts 1.
Installation of Electric Throttle Control Actuator
lTighten fixing bolts of electric throttle control actuator equally and diagonally in several steps.
lAfter installation perform procedure inEM-20, "INSPECTION AFTER INSTALLATION".
Connecting Quick Connector of Fuel Hose
lInstall quick connector as follows. (The steps are the same for quick connectors on engine side and vehi-
cle)
1. Make sure no foreign substances are deposited in and around tube and quick connector and no damage
on them.
2. Thinly apply new engine oil around the fuel tube tip end.
3. Align center to insert quick connector straightly into fuel tube.
lInsert fuel tube into quick connector until the first spool on fuel
tubes is inserted completely and the second one is positioned
slightly below the quick connectors bottom end.
CAUTION:
lHold A position in illustration when inserting fuel tube
into quick connector.
lCarefully align center to avoid inclined insertion to pre-
vent damage to O-ring inside quick connector.
lInsert until you hear a “click” sound and actually feel the
engagement.
lTo avoid misidentification of engagement with a similar sound, be sure to perform the next step.
4. Before clamping fuel hose with hose clamps, pull quick connector hard by hand holding A position. Make
sure it is completely engaged (connected) so that it does not come out from fuel tube.
NOTE:
Recommended pulling force is 50 N (5.1 kg, 11.2 lb).
5. Install quick connector cap on quick connector joint.
lDirect arrow mark on quick connector cap to upper side (The
figure shows quick connector cap for engine side).
6. Install fuel hose to hose clamp.
INSPECTION AFTER INSTALLATION
lCheck connections for fuel leakage.
1. Start the engine, and run it for a few minutes with engine at idle.
2. Stop the engine, and check for fuel leakage both visually and by odor of gasoline.
NOTE:
Use mirrors for checking on invisible points.
KBIA0234E
KBIA0272E
KBIA0298E

EM-26
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OIL PAN AND OIL STRAINER
c. Tighten bolts in numerical order as shown.
lNo.10, 11and 18 indicate double tightening of bolts 1,2 and 3.
NOTE:
Refer to the below for locating bolts.
M6´20 mm (0.79 in) : No. 19, 20
M8´25 mm (0.98 in) : No. 1, 3, 4, 9
M8x45mm(1.77in):No.2,5,6,7,8,17
M8 x100mm (3.97 in) : No. 12, 13, 14, 15,16
d. Tighten transmission joint bolts.
e. Install rear plate cover.
3. Install lower oil pan.
lUse Genuine Liquid gasket or equivalent.
lTighten bolts in numerical order as shown.
4. Install oil pan drain plug.
lRefer to illustration of components of former page for installation direction of washer.
5. Install in the reverse order of removal after this step.
lPour engine oil or start engine at least 30 minutes after oil pan is installed.
INSPECTION AFTER INSTALLATION
lCheck for leakage of engine oil when engine is warmed.
KBIA0097E
KBIA0098E
KBIA0096E

EM-28
[QR20DE]
SPARK PLUG
SPARK PLUG
PFP:22401
Removal and InstallationEBS009QX
REMOVAL
1. Remove ignition coil. Refer toEM-27, "Removal and Installation".
2. Remove spark plug with suitable spark plug wrench.
INSPECTION AFTER REMOVAL
lUse standard type spark plug for normal condition.
The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions
such as.
lfrequent engine starts.
llow ambient temperatures.
The cold type spark plug is suitable when spark plug knock occurs with the standard type spark plug under
conditions such as.
lextended highway driving.
lfrequent high engine revolution.
1. Check plug gap of each spark plug. Adjust or replace if necessary.
lUse a wire brush for cleaning, if necessary.
INSTALLATION
lInstall in the reverse order of removal.
Make NGK
Standard type LFR5A-11
Hot type LFR4A-11
Cold type LFR6A-11
SEM294A
Gap :
1.0 - 1.1mm (0.039 - 0.043 in)
SMA476
: 19.6 - 29.4 N·m (2.0 - 3.0 kg-m, 15 - 21 ft-lb)

EM-30
[QR20DE]
FUEL INJECTOR AND FUEL TUBE
INSTALLATION
1. Install O-rings to fuel injector paying attention to the items below.
lLubricate O-rings by smearing new engine oil.
lBe careful not to scratch it with a tool or fingernails during installation. Also be careful not to twist
or stretch O-ring. If O-ring was stretched while it is attached, do no insert it into fuel tube immedi-
atly.
2. Install fuel injector to fuel tube with the following procedure.
lInsert clip into clip mounting groove on fuel injector.
lInsert clip so that projection A of fuel injector matches notch A of
the clip.
lDo not reuse clip. Replace it with a new one.
lBe careful to keep clip from interfering with O-ring. If interfer-
ence occurs, replace O-ring.
3. Insert fuel injector into fuel tube with clip attached.
lInsertitwhilematchingittotheaxialcenter.
lInsert fuel injector so that projection B of fuel injector matches
notch B of the clip.
lMake sure that fuel tube flange is securely fixed in flange fixing
groove on clip.
lMake sure that installation is complete by checking that fuel
injector does not rotate or come off.
4. Install fuel tube assembly with the following procedure.
a. Insert the tip of each fuel injector into intake manifold.
b. Tighten mounting bolts in two steps in the numerical order
shown in the figure.
5. Install intake manifold collector. Refer toEM-17, "
INTAKE MANI-
FOLD".
6. Connect fuel hose. Refer toEM-17, "
INTAKE MANIFOLD".
7. Install all removed parts in the reverse order of removal.
INSPECTION AFTER INSTALLATION
lCheck connections for fuel leakage.
1. Start the engine, and run it for a few minutes with engine at idle.
2. Stop the engine, and check for fuel leakage both visually and by odor of gasoline.
NOTE:
Use mirrors for checking on invisible points.
CAUTION:
Do not touch the engine immediately after stopped as engine becomes extremely hot.
KBIA0240E
1st step: 9.3 - 10.8 N·m (0.95 - 1.1 kg-m, 0.7 - 0.8 ft-lb)
2nd step: 20.6 - 26.5 N·m (2.1 - 2.7 kg-m, 16 - 19 ft-lb)
KBIA0239E

EM-40
[QR20DE]
CAMSHAFT
ValveLifterHoleDiameter
lUsing inside micrometer, measure diameter of valve lifter hole of
cylinder head.
Calculation of Valve Lifter Clearance
(Valve lifter clearance) = (hole diameter of valve lifter) – (outer diam-
eter of valve lifter).
lWhen out of specified range, referring to each specification of outer and inner diameter, replace either or
both valve lifter and cylinder head.
Valve ClearanceEBS009R1
INSPECTION
lPerform inspection as follows after removal, installation or replacement of camshaft or valve-related parts,
or if there is unusual engine conditions due to changes in valve clearance over time (starting, idling, and/
or noise).
1. Warm up engine. Then stop it.
2. Remove front RH engine side cover.
3. Remove rocker cover.
Refer toEM-31, "
Removal and Installation".
4. Turn crankshaft pulley in normal direction (clockwise when
viewed from front) to align TDC identification notch (without
paint mark) with timing indicator.
5. At this time, check that the both intake and exhaust cam noses
of No. 1 cylinder face outside.
lIf they do not face outside, turn crankshaft pulley once more. Standard:
34.000 - 34.021 mm (1.3386 - 1.3394 in)
Standard:
0.020 - 0.056 mm (0.0008 - 0.0022 in)
PBIC0043E
KBIA0190E
KBIA0400J

CAMSHAFT
EM-41
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6. By referring to the figure, measure valve clearances at locations
marked X as shown in the table below (locations indicated with
black arrow in figure) with a feeler gauge.
lNo.1 cylinder compression TDC.
lUse a feeler gauge, measure clearance between valve and camshaft.
*Reference data at approximately 20°C(68°F)
CAUTION:
If inspection was carried out with cold engine, check that values with fully warmed up engine are still
within specifications.
7. Turn crankshaft one revolution (360°) and align mark on crankshaft pulley with pointer.
8. By referring to the figure, measure valve clearances at locations
marked X as shown in the table below (locations indicated with
black arrow in figure).
lNo.4 cylinder compression TDC.
9. If out of specifications, adjust as follows.
ADJUSTMENT
lPerform adjustment depending on selected head thickness of valve lifter.
lThe specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differ-
ences caused by temperature. Use the specifications for hot engine condition to adjust.
1. Remove camshaft. Refer toEM-33, "
Removal and Installation".
2. Remove the valve lifters at the locations that are outside the standard.
KBIA0248E
Cylinder No.1 No.2 No.3 No.4
Valve INT EXH INT EXH INT EXH INT EXH
Measurable´´´x
KBIA0185E
Valve clearance standard:
Hot Intake : 0.32 - 0.40 mm (0.013 - 0.016 in)
Exhaust : 0.33- 0.41 mm (0.013 - 0.016 in)
Cold* Intake : 0.24 - 0.32 mm (0.009- 0.013 in)
Exhaust : 0.26- 0.34 mm (0.010 - 0.013 in)
Cylinder No.1 No.2 No.3 No.4
Valve INT EXH INT EXH INT EXH INT EXH
Measurable x´x´
KBIA0249E

EM-42
[QR20DE]
CAMSHAFT
3. Measure the center thickness of the removed valve lifters with a
micrometer.
4. Use the equation below to calculate valve lifter thickness for replacement.
lValve lifter thickness calculation.
Thickness of replacement valve lifter = t1+ ( C1 — C2 )
t1 = Thickness of removed valve lifter.
C1 = Measured valve clearance.
C2=Standard valve clearance.
lThickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark 696 indicates 6.96mm (0.2740in) in thickness.
Available thickness of valve lifter: 26 sizes with range 6.96 to 7.46 mm (0.2740 to 0.2937 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory).
5. Install the selected valve lifter.
6. Install camshaft.
7. Manually turn crankshaft pulley a few turns.
8. Check that valve clearances for cold engine are within specifications by referring to the specified values.
9. After completing the repair, check valve clearances again with the specifications for warmed engine. Make
sure the values are within specifications.
Valve clearance:
Unit: mm (in)
*: Approximately 20°C(68°F)
KBIA0057E
Intake : 0.36 mm (0.0142 in)
Exhaust : 0.37 mm (0.0146 in)
KBIA0119E
Cold* (reference data) Hot
Intake 0.24 - 0.32 (0.009 - 0.013) 0.32 - 0.40 (0.013 - 0.016)
Exhaust 0.26 - 0.34( 0.010 - 0.013) 0.33 - 0.41 (0.013 - 0.016)

EM-48
[QR20DE]
TIMING CHAIN
INSTALLATION
NOTE:
lThe figure shows the relationship between the mating mark on
each timing chain and that on the corresponding sprocket, with
the components installed.
lBecause of parallel manufacture, there are two types of mark
(link colors) for timing chain.
1. Make suer that crankshaft key points straight up.
2. Tighten mounting bolt in the numerical order shown in the figure
with the following procedure, and install balancer unit.
CAUTION:
lWhen reusing a mounting bolt, check its outer diameter
before installation, Refer toEM-47, "
INSPECTION AFTER
REMOVAL".
a. Apply new engine oil to threads and seat surfaces of mounting
bolts.
b. Tighten them to 45.2 to 51.0 N·m (4.6 to 5.2kg-m, 34 to 37 ft-lb).
c. Turn them another 90 to 95°(Target: 90°).
d. Fully loosen to 0 N·m (0 kg-m, 0 ft-lb).
lLoosen in the reverse order of tightening.
e. Tighten them to 45.2 to 51.0 N·m (4.6 to 5.2 kg-m, 34 to 37 ft-lb).
f. Turn them another 90 to 95°(Target: 90°).
CAUTION:
lCheck tightening angle with an angle wrench or a pro-
tractor. Do not make judgment by visual check alone.
KBIA0079E
KBIA0122E
KBIA0080E

TIMING CHAIN
EM-51
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9. Install Intake valve timing control cover with the following procedure.
a. Install Intake valve timing control solenoid valves to Intake valve timing control cover.
b. Install Oil rings to the intake camshaft sprocket insertion points on Intake valve timing control backside
cover.
c. Install O-ring to front cover.
d. Apply liquid gasket to the positions in the figure.
e. Tighten mounting bolts in the numerical order shown in the fig-
ure.
10. Insert crankshaft pulley by aligning with crankshaft key.
lTap its center with a plastic hammer to insert.
lDo not tap belt hook.
11. Tighten crankshaft pulley mounting bolts.
lSecure crankshaft pulley with a pulley holder, and tighten the bolts.
lPerform angle tightening with the following procedure.
a. Apply new engine oil to threads and seat surfaces of mounting bolts.
b. Tighten to 37.3 to 47.1 N·m (3.8 to 4.8 kg-m, 28 to 34 ft-lb).
c. put a paint mark on front cover, mating with any one of six easy
to recognize stamp marks on bolt flange.
d. Turn another 60°to 66°[Target: 60°].
lCheck vertical mounting angle with movement of one stamp
mark.
12. Install remaining parts in reverse order of removal.
KBIA0084E
KBIA0085E
PBIC0258E

EM-52
[QR20DE]
CYLINDER HEAD
CYLINDER HEAD
PFP:11041
On-Vehicle ServiceEBS009R3
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer toEC-34, "
FUEL PRESSURE RELEASE"(WITH EURO-OBD),EC-399,
"FUEL PRESSURE RELEASE"(WITHOUT EURO-OBD).
3. Remove ignition coil and spark plug from each cylinder.
Refer to IGNITION COILEM-27, "
Removal and Installation"and SPARK PLUGEM-28, "Removal and
Installation".
4. Connect engine tachometer (not required in use of CONSULT-ll).
5. Disconnect fuel injector sub-harness to avoid fuel injection dur-
ing measurement.
6. Install compression tester with adapter onto spark plug hole.
lUse compression gauge whose picking up end inserted to spark
plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise,
it may be caught by cylinder head during removal.
7. With accelerator pedal fully depressed, turn ignition switch to
“START” for cranking. When the gauge pointer stabilizes, read
the compression pressure and engine rpm. Perform these steps
to check each cylinder.
Unit: mPa (bar, kg/cm2,psi)/rpm
CAUTION:
Always use a fully changed battery to obtain specified engine speed.
lIf the engine speed is out of specified range, check battery liquid for proper gravity. Check engine speed
again with normal battery gravity.
lIf compression pressure is below minimum value, check valve clearances and parts associated with com-
bustion chamber (Valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gas-
ket). After the checking, measure compression pressure again.
KBIA0269E
KBIA0130E
Standard MinimumDeference limit
between cylinders
1,19 (11.9,12.1, 173) /
2500,99 (9.9, 10.1, 144) /
2500.1 (1.0, 1.0, 14 ) / 250
SEM387C