2001 NISSAN X-TRAIL check engine

FUEL INJECTOR AND FUEL TUBE
EM-33
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●Do not remove or disassembly parts unless instructed as shown in the figure.
REMOVAL
1. Release fuel pressure. Refer to EC-775, "FUEL PRESSURE RELEASE" [QR20DE (WITH EURO-OBD)],
EC-1139, "
FUEL PRESSURE RELEASE" [QR20DE (WITHOUT EURO-OBD)], EC-42, "FUEL PRES-
SURE RELEASE" [QR25DE (WITH EURO-OBD)] or EC-452, "FUEL PRESSURE RELEASE" [QR25DE
(WITHOUT EURO-OBD)].
2. Remove air duct, air cleaner case (upper) assembly.
3. Disconnect fuel hose quick connector at fuel tube side.
●Regarding how to disconnect and connect quick connector, Refer to EM-16, "INTAKE MANIFOLD" .
CAUTION:
●Prepare a container of cloth for spilled fuel.
●This operation should be performed, in a place where free from fire.
●While hoses are disconnected seal their openings with vinyl bag or similar material to prevent
foreign material from entering them.
4. Remove intake manifold collector. Refer to EM-16, "
INTAKE MANIFOLD" .
5. Disconnect sub-harness for injector at engine front side, and remove it from bracket.
6. Loosen mounting bolts in the reverse order in the figure, and
remove fuel tube and fuel injector assembly.
7. Remove fuel tube and fuel injector assembly.
●Release clip and remove it.
●Pull fuel injector straight out of fuel tube.
●Be careful not to damage nozzle part.
●Avoid any impact such as a dropping.
●Do not disassemble or adjust it.
INSTALLATION
1. Install O-rings to fuel injector paying attention to the items below.
●Lubricate O-rings by smearing new engine oil.
●Be careful not to scratch it with a tool or fingernails dur-
ing 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 immediately.
2. Install fuel injector to fuel tube with the following procedure.
●Insert clip into clip mounting groove on fuel injector.
●Insert clip so that projection A of fuel injector matches notch A
of the clip.
●Do not reuse clip. Replace it with a new one.
●Be 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.
●Insert it while matching it to the axial center.
●Insert fuel injector so that projection B of fuel injector matches
notch B of the clip.
●Make sure that fuel tube flange is securely fixed in flange fixing groove on clip.
●Make 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.
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O-ring color
Fuel tube side (Upper side) : Black
Intake manifold side (Lower side) : Green
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EM-34
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FUEL INJECTOR AND FUEL TUBE
b. Tighten mounting bolts in two steps in the numerical order
shown in the figure.
5. Install intake manifold collector. Refer to EM-16, "
INTAKE MANI-
FOLD" .
6. Connect fuel hose. Refer to EM-16, "
INTAKE MANIFOLD" .
7. Install all removed parts in the reverse order of removal.
INSPECTION AFTER INSTALLATION
Check 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. 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)
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EM-42
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TIMING CHAIN
2. Tighten mounting bolt in the numerical order shown in the figure
with the following procedure, and install balancer unit.
CAUTION:
When reusing a mounting bolt, check its outer diameter
before installation, Refer to EM-41, "
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 5.2 kg-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).
●Loosen 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:
Check tightening angle with an angle wrench or a protrac-
tor. Do not make judgment by visual check alone.
3. Install crankshaft sprocket and timing chain for balancer unit.
●Make sure that crankshaft sprocket is positioned with mating
marks on block and sprocket meeting at the top.
●Install it by lining up mating marks on each sprocket and tim-
ing chain.
4. Install timing chain tensioner for balancer unit.
NOTE:
Chain guide and tensioner move freely with the caulking pin as
the axle. Therefore, bolt hole position of the three points could
be changed during removal. If points change, temporarily fix the
two mounting bolts on the chain guide, and move the tensioner
to mate the bolt holes.
●Be careful not to let mating marks of each sprocket and timing
chain slip.
●After installation, make sure the mating marks have not
slipped, then remove stopper pin and release tensioner.
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TIMING CHAIN
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●Secure crankshaft pulley with a pulley holder, and tighten the bolt.
●Perform angle tightening with the following procedure.
a. Apply new engine oil to thread and seat surfaces of mounting bolt.
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°].
●Check vertical mounting angle with movement of one stamp
mark.
12. Install remaining parts in reverse order of removal.
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CAMSHAFT
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Valve Lifter Hole Diameter
Using inside micrometer, measure diameter of valve lifter hole of cyl-
inder head.
Calculation of Valve Lifter Clearance
(Valve lifter clearance) = (hole diameter of valve lifter) – (outer diam-
eter of valve lifter).
●When out of specified range, referring to each specification of
outer and inner diameter, replace either or both valve lifter and
cylinder head.
Va l v e C l e a r a n c eEBS00LS3
INSPECTION
Perform 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 splash cover on RH undercover.
3. Remove rocker cover. Refer to EM-35, "
ROCKER COVER" .
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.
●If they do not face outside, turn crankshaft pulley once more.
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.
●No. 1 cylinder compression TDC.Standard: 34.000 - 34.021 mm (1.3386 - 1.3394 in)
Standard: 0.020 - 0.056 mm (0.0008 - 0.0022 in)
PBIC0043E
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Measuring position No.1 CYL. No.2 CYL. No.3 CYL. No.4 CYL.
No.1 cylinder at
TDCINT X X
EXH X X
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CAMSHAFT
●Use 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).
●No.4 cylinder compression TDC.
9. If out of specifications, adjust as follows.
ADJUSTMENT
●Perform adjustment depending on selected head thickness of valve lifter.
●The 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 to EM-46, "
REMOVAL" .
2. Remove the valve lifters at the locations that are outside the standard.
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.
●Valve lifter thickness calculation.
t = t1 + (C1 – C2)
t = Thickness of replacement valve lifter
t1 = Thickness of removed valve lifter.
C1 = Measured valve clearance.
C2 = Standard valve clearance in cold condition [approximately 20°C (68°F)]. Valve clearance standard:
Hot Intake : 0.304 - 0.416 mm (0.012 - 0.016 in)
Exhaust : 0.308 - 0.432 mm (0.012 - 0.017 in)
Cold* Intake : 0.24 - 0.32 mm (0.009 - 0.013 in)
Exhaust : 0.26 - 0.34 mm (0.010 - 0.013 in)
Measuring position No.1 CYL. No. 2 CYL. No.3 CYL. No.4 CYL.
No.4 cylinder at
TDCINT X X
EXH X X
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Intake : 0.36 mm (0.0142 in)
Exhaust : 0.37 mm (0.0146 in)

CAMSHAFT
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●Thickness of a new valve lifter can be identified by stamp
marks on the reverse side (inside the cylinder).
Stamp mark 696 indicates 6.96 mm (0.2740 in) 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 specifica-
tions 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.
*: Reference data at approximately 20°C (68°F) 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)
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CYLINDER HEAD
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CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00KNP
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-775, "
FUEL PRESSURE RELEASE" [QR20DE (WITH EURO-OBD)],
EC-1139, "
FUEL PRESSURE RELEASE" [QR20DE (WITHOUT EURO-OBD)], EC-42, "FUEL PRES-
SURE RELEASE" [QR25DE (WITH EURO-OBD)] or EC-452, "FUEL PRESSURE RELEASE" [QR25DE
(WITHOUT EURO-OBD)].
3. Remove ignition coil and spark plug from each cylinder. Refer to EM-29, "
IGNITION COIL" and EM-30,
"SPARK PLUG" .
4. Connect engine tachometer (not required in use of CONSULT-II).
5. Disconnect fuel injector sub-harness to avoid fuel injection dur-
ing measurement.
6. Install compression tester with adapter onto spark plug hole.
●Use 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.
Compression pressure
Unit: kPa (bar, kg/cm2 , psi) /rpm
CAUTION:
Always use a fully changed battery to obtain specified engine speed.
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SEM387C
Engine type Standard Minimum Deference limit between cylinders
QR20DE 1,190 (11.9, 12.1, 173) / 250 990 (9.9, 10.1, 144) / 250
100 (1.0, 1.0, 14) / 250
QR25DE 1,250 (12.5, 12.8, 181.3) / 250 1,060 (10.6, 10.8, 153.7) / 250