2000 NISSAN PATROL fuel pump

Normal control
Input/output signal chart
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (TDC) Engine speed
Fuel injection con-
trol (Normal con-
trol)Electronic control fuel injec-
tion pump Accelerator position sensor Accelerator position
Vehicle speed sensor Vehicle speed
The amount of fuel injected under normal driving conditions is
determined according to sensor signals. The crankshaft position
sensor (TDC) detects engine speed and the accelerator position
sensor detects accelerator position. These sensors send signals
to the ECM.
The fuel injection data, predetermined by correlation between
various engine speeds and accelerator positions, are stored in
the ECM memory, forming a map. The ECM determines the
optimal amount of fuel to be injected using the sensor signals in
comparison with the map.
Maximum amount control
Input/output signal chart
Sensor Input Signal to ECM ECM Function Actuator
Mass air flow sensor Amount of intake air
Fuel injection con-
trol (Maximum
amount control)Electronic control fuel injec-
tion pump Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (TDC) Engine speed
Accelerator position sensor Accelerator position
The maximum injection amount is controlled to an optimum by the engine speed, intake air amount, engine
coolant temperature, and accelerator opening in accordance with the driving conditions.
This prevents the oversupply of the injection amount caused by decreased air density at a high altitude or
during a system failure.
Deceleration control
Input/output signal chart
Sensor Input Signal to ECM ECM Function Actuator
Accelerator switch (F/C) Accelerator positionFuel injection con-
trol (Deceleration
control)Electronic control fuel injec-
tion pump
Crankshaft position sensor (TDC) Engine speed
The ECM sends a fuel cut signal to the electronic control fuel injection pump during deceleration for better
fuel efficiency. The ECM determines the time of deceleration according to signals from the accelerator switch
(F/C) and crankshaft position sensor (TDC).
SEF649S
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTIONZD30DDTi
Fuel Injection Control System (Cont'd)
EC-1020

Fuel Injection Timing Control System
DESCRIPTION
The target fuel injection timing in accordance with the engine speed and the fuel injection amount are
recorded as a map in the ECM beforehand. The ECM and the injection pump control unit exchange signals
and perform feedback control for optimum injection timing in accordance with the map.
Air Conditioning Cut Control
DESCRIPTION
Input/output signal chart
Sensor Input Signal to ECM ECM Function Actuator
Air conditioner switch Air conditioner ªONº signal
Air conditioner cut
controlAir conditioner relay Accelerator position sensorAccelerator valve opening
angle
Vehicle speed sensor Vehicle speed
Engine coolant temperature sensor Engine coolant temperature
System description
This system improves acceleration when the air conditioner is used.
When the accelerator pedal is fully depressed, the air conditioner is turned off for a few seconds.
When engine coolant temperature becomes excessively high, the air conditioner is turned off. This contin-
ues until the engine coolant temperature returns to normal.
Fuel Cut Control (at no load & high engine
speed)
DESCRIPTION
Input/output signal chart
Sensor Input Signal to ECM ECM Function Actuator
Vehicle speed sensor Vehicle speed
Fuel cut controlElectronic control fuel injec-
tion pump Park/Neutral position (PNP) switch Neutral position
Accelerator position switch or Accelerator
switch (F/C)Accelerator position
Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (TDC) Engine speed
If the engine speed is above 2,700 rpm with no load (for example, in neutral and engine speed over 2,700
rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed.
Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed under ªFuel Injection Control Systemº,
EC-1019.
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTIONZD30DDTi
EC-1021

Inspection for spill tube airtightness
Before the rocker cover is installed, perform the inspection as
follows.
1. Connect the handy vacuum pump to the spill hose.
2. Check that the airtightness is maintained after the negative
pressure shown below is applied.
Standard:
þ53.3 to þ66.7 kPa (þ533 to þ667 mbar, þ400 to
þ500 mmHg, þ15.75 to þ19.69 inHg)
Air bleeding of fuel piping
After the repair, bleed air in the piping by pumping the priming
pump up and down until it becomes heavy.
Injection pressure test
1. Install injection nozzle assembly to injection nozzle tester
and bleed air from flare nut.
2. Pump the tester handle slowly (one time per second) and
watch the pressure gauge.
3. Read the pressure gauge when the injection pressure just
starts dropping.
Initial injection pressure:
Used
19,026 kPa (190.3 bar, 194 kg/cm
2, 2,759 psi)
New
19,516 - 20,497 kPa (195.2 - 205.0 bar, 199 - 209
kg/cm
2, 2,830 - 2,972 psi)
Limit
16,182 kPa (161.8 bar, 165 kg/cm
2, 2,346 psi)
+The injection nozzle assembly has a 2-stage pressure injec-
tion function. However, the judgement should be made at the
first stage of the valve opening pressure.
JEF250Z
SEF251Z
JEF348Y
BASIC SERVICE PROCEDUREZD30DDTi
Injection Tube and Injection Nozzle (Cont'd)
EC-1025

Spray pattern test
1. Check spray pattern by pumping tester handle one full stroke
per second.
NG spray pattern:
Does not inject straight and strong (B in the fig-
ure).
Fuel drips (C in the figure).
Does not inject evenly (D in the figure).
2. If the spray pattern is not correct, replace injection nozzle
assembly.
Electronic Control Fuel Injection Pump
REMOVAL AND INSTALLATION
CAUTION:
When removing or installing the timing chain as incidental work of the fuel injection pump removal/
installation, always secure the internal mechanism of the idler gear with bolts before removing or
installing the fuel injection pump sprocket. Do not refer to the procedure for ªTIMING CHAINº in EM
section based on No. 1 cylinder compression top dead center. (Unless otherwise specified.)
JEF349Y
JEF259Z
BASIC SERVICE PROCEDUREZD30DDTi
Injection Tube and Injection Nozzle (Cont'd)
EC-1026

REMOVAL
1. Remove the following:
+Engine coolant draining
+Charge air cooler
+Air inlet pipe
+Throttle body
+Rocker cover
+Oil level gauge guide
+EGR guide tube
+EGR volume control solenoid valve
+Fuel hose
+Injection tube
+Radiator upper hose
+Radiator shroud
+Cooling fan
+Drive belt
+Vacuum pipe
+Vacuum pump
2. Move the power steering pump.
3. Remove the harness connector from the fuel injection pump.
+After pulling the connector stopper all the way back, remove
the connector.
+When the stopper is pulled all the way back, the interlocked-
connector will come off.
As for installation, when the connector is pushed all the way
forward until the stopper locks, the interlocked-connector is
inserted.
4. Remove the fuel injection pump rear bracket.
5. Remove the chain cover.
+Remove the installation bolts A, B, and C shown in the fig-
ure (left).
CAUTION:
During chain cover removal, seal the opening to prevent
foreign objects from getting into the engine.
6. Fix the internal mechanism of the idler gear (scissors gear
structure).
a. Remove the plug on the front side of the gear case.
b. While turning the crankshaft pulley clockwise, check the
tightening bolt hole of the idler gear internal mechanism
through the plug hole.
+Conduct the visual check using a mirror.
+When checking, note that there are 2 other holes (with no
thread) beside the tightening bolt hole on the idler gear.
JEF260Z
JEF261Z
JEF262Z
BASIC SERVICE PROCEDUREZD30DDTi
Electronic Control Fuel Injection Pump (Cont'd)
EC-1027

c. Install the tightening bolt [Part No.: 81-20620-28, thread
diameter: M6, under head: 20 mm (0.79 in), pitch: 1.0 mm
(0.039 in)] to the idler gear tightening bolt hole, and tighten
to the specified torque:
: 2.5 - 3.4 Nzm (0.25 - 0.35 kg-m, 22 - 30 in-lb)
CAUTION:
+To protect the idler gear from damage, do not use the
substitute part for the tightening bolt.
+Hereafter, do not turn the crankshaft to avoid hitting
tightening bolt head against the gear case.
+Do not remove the idler gear tightening bolt before
installations of the timing chain and related parts are
completed.
7. Make mating marks on the cam sprocket, fuel injection pump
sprocket, and timing chain with paint.
8. Make mating marks on the fuel injection pump gear and idler
gear with paint.
9. Remove the chain tensioner.
(1) Loosen the upper and lower installation bolts.
(2) While holding the chain tensioner by hand, remove the upper
installation bolt to release the spring tension.
(3) Remove the lower installation bolt first, and then the chain
tensioner.
+Since the chain tensioner does not have a mechanism to
prevent the plunger pop-out, watch out for the fall of the
plunger and spring. (Return prevention mechanism is avail-
able.)
10. Remove the timing chain slack guide.
11. Remove the cam sprocket and timing chain at the same time.
+Make mating marks on each sprocket and timing chain.
+Hold the hexagon head of the camshaft on the exhaust mani-
fold side, and loosen the cam sprocket installation bolt.
CAUTION:
Do not loosen the installation bolt using a chain tension.
12. Remove the fuel injection pump sprocket and gear as an
assembly.
+Fix the fuel injection pump gear with the pulley holder (SST),
and loosen the installation bolt for removal.
+Try not to move the pump shaft when removing.
+Connect the sprocket and gear with a dowel pin, and tighten
them together with the installation bolt.
JEF263Z
JEF264Z
JEF265Z
JEF266Z
JEF267Z
BASIC SERVICE PROCEDUREZD30DDTi
Electronic Control Fuel Injection Pump (Cont'd)
EC-1028

13. Make the mating marks on the fuel injection pump flange and
front plate with paint.
14. Remove installation bolts first, and then fuel injection pump
toward the rear side of the engine.
+When the fuel injection pump is stationary, it can still be
retained by the dowel without all bolts.
CAUTION:
Do not disassemble or adjust the fuel injection pump.
INSTALLATION
+The injection timing adjustment to correct the installation
angle deviation is not necessary. Install the pump in the
proper position according to the dowel and installation bolts.
1. Install the fuel injection pump from the rear side of the
engine.
+Match the dowel of the spacer to the dowel hole of the pump
side for installation.
+Replace the seal washer of the installation bolt with a new
one.
2. Align the mating marks of the fuel injection pump flange and
front plate, and then adjust the approximate flange position.
+Each hole [6 mm (0.24 in) dia.] is used as a reference point
for the fuel injection pump flange, fuel injection pump gear,
and fuel injection pump sprocket.
+Only during removal/installation at No. 1 cylinder compres-
sion top dead center, can the hole [6 mm (0.24 in) dia.] of the
pump body be aligned.
3. Install the fuel injection pump sprocket and gear as an
assembly.
+Align the mating marks of the idler gear and fuel injection
pump gear properly.
4. Tighten the installation bolt of the fuel injection pump
sprocket.
+Fix the fuel injection pump gear with the pulley holder (SST),
and tighten the installation bolt.
CAUTION:
Before tightening the installation bolt, check again that the
mating marks of the idler gear and fuel injection pump gear
are aligned.
JEF268Z
JEF269Z
JEF270Z
JEF271Z
JEF267Z
BASIC SERVICE PROCEDUREZD30DDTi
Electronic Control Fuel Injection Pump (Cont'd)
EC-1029

5. Install the cam sprocket and timing chain at the same time.
+Align the mating marks of the fuel injection pump sprocket
and cam sprocket, and install the timing chain.
+Holding the hexagon head of the camshaft with a wrench,
tighten the cam sprocket installation bolt.
CAUTION:
Do not tighten the installation bolt using a chain tension.
6. Install the timing chain, related parts, and the chain cover.
Refer to EM section, ªTIMING CHAINº.
7. Remove the tightening bolt of the idler gear internal mecha-
nism.
8. Apply the liquid gasket to the screw of the plug, and tighten
the plug.
: 7.9 - 9.8 Nzm (0.8 - 1.0 kg-m, 70 - 86 in-lb)
+Use Genuine Liquid Gasket or equivalent.
9. Install the fuel injection pump rear bracket.
+Tighten all the installation bolts temporarily, and then tighten
them firmly with both surfaces of the fuel injection pump and
cylinder block attached to the installation surface.
10. Connect the harness connector of the fuel injection pump.
+Insert the harness connector until the stopper is completely
locked.
+When the connector is pushed fully to lock the stopper, the
interlocked-connector is inserted.
11. Installation is in the reverse order of removal.
JEF264Z
JEF272Z
JEF273Z
JEF260Z
BASIC SERVICE PROCEDUREZD30DDTi
Electronic Control Fuel Injection Pump (Cont'd)
EC-1030