Nissan Terrano model r20 series 2004. Instruction — part 75
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 per-
form 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 “ON” signal
Air conditioner cut
control
Air conditioner relay
Accelerator position sensor
Accelerator 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 continues
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 control
Electronic 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 “Fuel Injection Control System”, EC-20.
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
ZD30DDTi
EC-22
Crankcase Ventilation System
DESCRIPTION
In this system, blow-by gas is sucked into the air inlet pipe after oil
separation by oil separator in the rocker cover.
INSPECTION
Ventilation hose
1. 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.
JEF224Z
SEC692
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
ZD30DDTi
EC-23
Injection Tube and Injection Nozzle
REMOVAL AND INSTALLATION
CAUTION:
I
Do not disassemble injection nozzle assembly. If NG,
replace injection nozzle assembly.
I
Plug flare nut with a cap or rag so that no dust enters the
nozzle. Cover nozzle tip for protection of needle.
Injection tube
Removal
1. Mark the cylinder Nos. to the injection tubes, then disconnect
them.
I
Marking should be made at proper locations and by the
proper method, so that they are not erased by fuel, etc.
2. Remove the clamps, then disconnect the tubes one by one.
I
Avoid letting leaked fuel get on the interior walls of the
engine compartment.
Take special care to prevent fuel from getting on the engine
mount insulator.
JEF237Z
JEF238Z
BASIC SERVICE PROCEDURE
ZD30DDTi
EC-24
Installation
I
Install the injection tubes, referring to the markings made dur-
ing removal.
I
Install the injection tubes in the order of No. 3, No. 4, No. 1, and
No. 2.
Injection nozzle oil seal
Removal
Using a tool such as a flat-bladed screwdriver, pry the flange of the
seal, then remove it.
Installation
After the injection nozzle assembly is installed, push the seal from
the cylinder head side until it contacts the flange.
I
Replace the oil seal with new one when the injection nozzle
assembly is removed. (It is not necessary to replace the oil
seal when only injection tubes are removed.)
Spill tube
Installation
I
After the spill tube is installed, check the airtightness of
the spill tube.
I
After the bolts are tightened, the joint of the spill tube gasket
might be broken. However, this will not affect function.
Injection nozzle assembly
Removal
1. Remove the nozzle support, then pull out the injection nozzle
assembly by turning it clockwise/counterclockwise.
2. Using a tool such as a flat-head screwdriver, remove the cop-
per washer inside the cylinder head.
CAUTION:
Do not disassemble the injection nozzle.
Installation
1. Insert the nozzle gasket to the cylinder head hole.
2. Attach the O-ring to the mounting groove of the nozzle side,
then insert it in the cylinder head.
TEST AND ADJUSTMENT
WARNING:
When using nozzle tester, be careful not to allow diesel fuel
sprayed from nozzle to contact your hands or body, and make
sure your eyes are properly protected with goggles.
JEF248Z
JEF249Z
BASIC SERVICE PROCEDURE
ZD30DDTi
Injection Tube and Injection Nozzle (Cont’d)
EC-25
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