2001 NISSAN PICK-UP Repair Manual

Positive Crankcase Ventilation
DESCRIPTIONNEEC0022
AEC042B
This system returns blow-by gas to the intake collector.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air duct into the crankcase. In this process the air passes through
the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not meet the requirement. This is because some
of the flow will go through the hose connection to the intake collector under all conditions.
SEC137A
INSPECTIONNEEC0023PCV (Positive Crankcase Ventilation) ValveNEEC0023S01With engine running at idle, remove PCV valve from breather sepa-
rator. A properly working valve makes a hissing noise as air passes
through it. A strong vacuum should be felt immediately when a fin-
ger is placed over the valve inlet.
ET277
Ventilation HoseNEEC0023S021. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any
hose cannot be freed of obstructions, replace.
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Positive Crankcase Ventilation
EC-3032

SEC305D
PEF823K
Fuel Pressure ReleaseNEEC0024Before disconnecting fuel line, release fuel pressure from fuel
line to eliminate danger.
WITH CONSULT-IINEEC0024S011. Start engine.
2. Perform ªFUEL PRESSURE RELEASEº in ªWORK SUP-
PORTº mode with CONSULT-II.
3. After engine stalls, crank it two or three times to release all fuel
pressure.
4. Turn ignition switch OFF.
SEC306D
WITHOUT CONSULT-IINEEC0024S021. Remove fuse for fuel pump.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel
pressure.
4. Turn ignition switch OFF and reconnect fuel pump fuse.
AEC064B
SEF318V
Fuel Pressure CheckNEEC0025+When reconnecting fuel line, always use new clamps.
+Make sure that clamp screw does not contact adjacent
parts.
+Use a torque driver to tighten clamps.
+Use Pressure Gauge to check fuel pressure.
+Do not perform fuel pressure check with system operat-
ing. Fuel pressure gauge may indicate false readings.
1. Release fuel pressure to zero.
2. Disconnect fuel hose between fuel filter and fuel tube (engine
side).
3. Install pressure gauge between fuel filter and fuel tube.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.
At idle speed:
With vacuum hose connected
Approximately 235 kPa (2.35 bar, 2.4 kg/cm
2,34
psi)
With vacuum hose disconnected
Approximately 294 kPa (2.94 bar, 3.0 kg/cm
2,43
psi)
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Fuel Pressure Release
EC-3033

If results are unsatisfactory, perform Fuel Pressure Regulator
Check, EC-3034.
SEF718B
Fuel Pressure Regulator CheckNEEC00261. Stop engine and disconnect fuel pressure regulator vacuum
hose from intake manifold.
2. Plug intake manifold with a rubber cap.
3. Connect variable vacuum source to fuel pressure regulator.
4. Start engine and read indication of fuel pressure gauge as
vacuum is changed.
Fuel pressure should decrease as vacuum increases. If results
are unsatisfactory, replace fuel pressure regulator.
SEF319V
SEF116V
SEF117V
Injector
REMOVAL AND INSTALLATIONNEEC00271. Release fuel pressure to zero.
2. Remove injector tube assembly with injectors from intake
manifold.
3. Remove injectors from injector tube assembly.
+Push injector tail piece.
+Do not pull on the connector.
4. Install injector to fuel tube assembly.
a. Clean exterior of injector tail piece.
b. Use new O-rings.
Always replace O-rings with new ones.
Lubricate O-rings with a smear of engine oil.
5. Install injectors with fuel tube assembly to intake manifold.
Tighten in numerical order shown in the figure.
a. First, tighten all bolts to 9.3 to 10.8 N´m (0.95 to 1.1 kg-m, 6.9
to 8.0 ft-lb).
b. Then, tighten all bolts to 21 to 26 N´m (2.1 to 2.7 kg-m, 15 to
20 ft-lb).
6. Install fuel hoses to fuel tube assembly.
7. Reinstall any parts removed in reverse order of removal.
CAUTION:
After properly connecting injectors to fuel tube assembly,
check connections for fuel leakage.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Fuel Pressure Check
EC-3034

SEF500V
Fast Idle Cam (FIC)
COMPONENT DESCRIPTIONNEEC0502The FIC is installed on the throttle body to maintain adequate
engine speed while the engine is cold. It is operated by a volumet-
ric change in wax located inside the thermo-element. The thermo-
element is operated by engine coolant temperature.
For inspection refer to ªTROUBLE DIAGNOSIS-BASIC
INSPECTIONº, ªBasic Inspectionº, EC-3086.
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment
NEEC0028PREPARATIONNEEC0028S05+Make sure that the following parts are in good order.
a)Battery
b)Ignition system
c)Engine oil and coolant levels
d)Fuses
e)ECM harness connector
f)Vacuum hoses
g)Air intake system
(Oil filler cap, oil level gauge, etc.)
h)Fuel pressure
i)Engine compression
j)Throttle valve
k)EVAP system
+On models equipped with air conditioner, checks should be carried out while the air conditioner is
ªOFFº.
+When measuring ªCOº percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
+Turn off headlamps, heater blower.
+Keep front wheels pointed straight ahead.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Fast Idle Cam (FIC)
EC-3035

Overall Inspection SequenceNEEC0028S0501
SEF554YB
NOTE:
If a vehicle contains a part which is operating outside of design specifications with no MI illumination,
the part shall not be replaced prior to emission testing unless it is determined that the part has been
tampered with or abused in such a way that the diagnostic system cannot reasonably be expected to
detect the resulting malfunction.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3036

INSPECTION PROCEDURE=NEEC0028S02
1 INSPECTION START
1. Visually check the following:
+Air cleaner clogging
+Hoses and duct for leaks
+Electrical connectors
+Gasket (intake manifold, cylinder head, exhaust system)
+Throttle valve and throttle position sensor operation
2. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine speed stays below 1,000 rpm.
SEF810K
3. Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load.
4. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK©+GO TO 2. (With CONSULT-II)
+GO TO 3. (Without CONSULT-II)
NG©1. Repair or replace components as necessary.
2. GO TO 2. (With CONSULT-II)
3. GO TO 3. (Without CONSULT-II)
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3037

2 CHECK IGNITION TIMING
With CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine two or three times under no-load, then run engine at idle speed for about 1 minute.
SEF978U
3. Select ªIGNITION TIMING ADJº in WORK SUPPORT mode.
4. Touch ªSTARTº.
PEF546N
5. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
6. Check ignition timing with a timing light.
SEF320V
M/T: 15ɱ2É BTDC
OK or NG
OK©GO TO 5.
NG©GO TO 4.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3038

3 CHECK IGNITION TIMING
Without CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine two or three times under no-load, then run engine at idle speed for about 1 minute.
SEF978U
3. Turn off engine and disconnect throttle position sensor harness connector.
SEF265S
4. Start engine and rev it (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
5. Check ignition timing with a timing light.
SEF320V
M/T: 15ɱ2É BTDC
OK or NG
OK©GO TO 5.
NG©GO TO 4.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3039