Toyota 1NZ-FE User manual

ENGINE - 1NZ-FE ENGINE
00REG01Y
00REG02Y
EG-2
1NZ-FE ENGINE
DESCRIPTION
The 1NZ-FE engine is a in-line, 4-cylinder, 1.5 liter, 16-valve DOHC engine.
The VVT-i (Variable Valve Timing-intelligent) system, DIS (Direct Ignition System) and ETCS-i (Electronic
Throttle Control System-intelligent) are used on this engine in order to realize high performance, quietness,
fuel economy and clean emission.

ENGINE - 1NZ-FE ENGINE
247EG02
: IN Opening Angle
: EX Opening Angle
VVT-i Operation Angle TDC
27
33
52
VVT-i Operation Angle 12
42
BDC
EG-3
Engine Specifications 
No. of Cyls. & Arrangement 4-Cylinder, In-line
Valve Mechanism 16-Valve DOHC, Chain Drive (with VVT-i)
Combustion Chamber Pentroof Type
Manifolds Cross-Flow
Fuel System SFI
Ignition System DIS
Displacement cm3(cu. in.) 1497 (91.3)
Bore x Stroke mm (in.) 75.0 x 84.7 (2.95 x 3.33)
Compression Ratio 10.5 : 1
Max. Output*1(SAE-NET) 79 kW @ 6000 rpm (106 HP @ 6000 rpm)
Max. Torque*1(SAE-NET) 139 N.m @ 4200 rpm (103 ft lbf @ 4200 rpm)
Intake
Open -7- 33BTDC
Valve Intake Close 52- 12ABDC
Valve
Timing
Exhaust
Open 42BBDC
g
Exhaust Close 2ATDC
Firing Order 1 - 3 - 4 - 2
Research Octane Number 90 or higher
Octane Rating 87 or higher
Oil Grade ILSAC
Tailpipe Emission Regulation TIRE2, ULEV-II
Evaporative Emission Regulation ORVR
Engine Service Mass*2
kg (lb)
M/T 83.2 (183.4)
Engine
Service
Mass
(Reference)
k
g
(lb)
A/T 77.8 (171.5)
*1: Maximum output and torque rating is determined by revised SAE J1349 standard.
*2: Weight shows the figure with the oil fully filled.
Valve Timing 

ENGINE - 1NZ-FE ENGINE
EG-4
FEATURES OF 1NZ-FE ENGINE
The 1NZ-FE engine has been able to achieve the following performance through the adoption of the items
listed below.
(1) High performance and fuel economy
(2) Low noise and vibration
(3) Lightweight and compact design
(4) Good serviceability
(5) Clean emission
Section Item (1) (2) (3) (4) (5)
A cylinder block made of aluminum is used. 
Engine Proper
An offset crankshaft is used.   
E
ng
i
ne
P
roper The taper squish shape is used for the combustion
chamber.  
Valve A timing chain and chain tensioner are used.   
Valve
Mechanism The VVT-i system is used.  
Intake manifold made of plastic is used. 
The linkless-type throttle body is used.  
Intake and A stainless steel exhaust manifold is used. 
Exhaust System Two TWCs (Three Way Catalytic Converter) are used. 
A rearward exhaust layout is used to realize the early
activation of the catalyst. 
12-hole type injector is used.  
Fuel System
The fuel returnless system is used.   
F
ue
l
S
ys
t
em Quick connectors are used to connect the fuel hose with
the fuel pipes. 
The long-reach type spark plugs are used. 
Ignition System The DIS (Direct Ignition system) makes ignition timing
adjustment unnecessary.   
The ETCS-i (Electronic Throttle Control
System-intelligent) is used.  
En
g
ine Control
The non-contact sensor is used in the throttle position
sensor and accelerator pedal position sensor. 
Engine
Control
System The cranking hold function is used. 
y
Evaporative emission control system is used. 
The use of an air fuel ratio sensor allows for precise
control. 

ENGINE - 1NZ-FE ENGINE
247EG03
EX
Injector
IN
Water Jacket
Taper Squish
193EG05
247EG04
Bore Center
Crankshaft Center
Crankshaft
Center
Maximum
Pressure
Offset Crankshaft Center Crankshaft
EG-5
ENGINE PROPER
1. Cylinder Head
The injectors are installed in the cylinder head to reduce the distance from injector to intake valve, thus
it prevents the fuel from adhering to the intake port walls, and reduce exhaust emissions.
The routing of the water jacket in the cylinder head is optimized to achieve high cooling performance.
Through the use of the taper squish combustion chamber, the engine’s knocking resistance and fuel
efficiency have been improved.
2. Cylinder Block
Lightweight aluminum alloy is used for the cylinder block.
Through the use of the offset crankshaft, the bore center is shifted 12 mm (0.472 in.) towards the intake,
in relation to the crankshaft center. Thus, the side force to cylinder wall is reduced when the maximum
pressure is applied, which contributes to fuel economy.

ENGINE - 1NZ-FE ENGINE
00REG19Y
A
A
Irregularly shaped outer
casting surface of liner Cylinder Block
Liner
A - A Cross Section
247EG06
Taper Squish Shape
Piston Ring
EG-6
The liners are the spiny-type, which have been manufactured so that their casting exterior forms a large
irregular surface in order to enhance the adhesion between the liners and the aluminum cylinder block.
The enhanced adhesion helps improve heat dissipation, resulting in a lower overall temperature and heat
deformation of the cylinder bores.
3. Piston
The piston is made of aluminum alloy
The piston head portion is used a taper squish shape to accomplish fuel combustion efficiency.
Semi floating type piston pins are used.
By increasing the machining precision of the cylinder bore diameter, only one size of piston is available.

ENGINE - 1NZ-FE ENGINE
171EG07
Plastic Region Tightening Bolts
171EG08
Crankshaft Position
Sensor Rotor
Oil Hole Crank Pin
No.5 Journal
Balance Weight
No.4 Journal
No.3 Journal
No.2 Journal
No.1 Journal
EG-7
4. Connecting Rod
The connecting rods and caps are made of high
strength steel for weight reduction.
Nutless-type plastic region tightening bolts are
used for a light design.
5. Crankshaft
The diameter and width of the pins and journals have been reduced, and the pins for the No.1 and No.4
cylinders have been made highly rigid to realize a lightweight and low-friction performance.
The crankshaft has 5 journals and 4 balance weights.
A crankshaft position sensor rotor is pressed into the crankshaft to realize an integrated configuration.

ENGINE - 1NZ-FE ENGINE
165EG12171EG09
Chain
Tension Arm
Chain
Tensioner
VVT-i
Controller
Timing Chain Exhaust Camshaft
Intake
Camshaft
Chain Guide
Camshaft
Valve Lifter
Valve
Service Tip
The adjustment of the valve clearance is accomplished by selecting and replacing the appropriate
valve lifters. Adjusting valve lifters are available in 35 increments of 0.020 mm (0.0008 in.), from
5.060 mm (0.1992 in.), to 5.740 mm (0.2260 in.).
For details, refer to 2006 Yaris Repair Manual (Pub. No. RM00R0U).
EG-8
VALVE MECHANISM
1. General
The shimless type valve lifter is used to increase the amount of the valve lift.
The intake and exhaust camshafts are driven by a timing chain.
The VVT-i system is used to realize fuel economy, engine performance and reduce exhaust emissions. For
details of VVT-i control, see page EG-41.

ENGINE - 1NZ-FE ENGINE
247EG08
VVT-i Controller
Exhaust Camshaft
Timing Rotor
Intake Camshaft
Oil Passage (Advance)
Oil Passage (Retard)
247EG09
Spring Plunger
Cam
Cam Spring
Check Ball
Chain
Slipper
Timing Chain
Chain Damper
Oil Jet
EG-9
2. Camshaft
Oil passages are provided in the intake camshaft in order to supply engine oil to the VVT-i system.
A VVT-i controller is provided on the front of the intake camshaft to vary the timing of the intake valves.
A Timing rotor is provided behind the intake camshaft to trigger the camshaft position sensor.
3. Timing Chain and Chain Tensioner
A roller type timing chain with an 8.0 mm (0.315 in.) pitch is used to make the engine compact and reduce
noise.
The timing chain is lubricated by an oil jet.
The chain tensioner uses a spring and oil pressure to maintain proper chain tensioner at all times. The chain
tensioner suppresses noise generated by the timing chain.
A ratchet type non-return mechanism is used in the chain tensioner.
Chain Tensioner 

ENGINE - 1NZ-FE ENGINE
171EG32171EG31
Service Hole for
Chain Tensioner
Front View
Oil Pump
Back View
EG-10
4. Timing Chain Cover
A single-piece, aluminum diecast timing chain cover that entirely seals the front portion of the cylinder
block and cylinder head is used.
A service hole for the chain tensioner is provided in the timing chain cover to improve serviceability.

ENGINE - 1NZ-FE ENGINE
171EG14
Camshaft Timing
Oil Control Valve
VVT-i
Controller
Chain
Tensioner
Oil Pump Oil Strainer
Oil Filter
171EG15
Main Oil Hole
Crankshaft
Journal
Oil Filter
Relief
Valve Connecting
Rod
Oil Pump Oil Jet
Oil Strainer
Piston
Oil Jet
Cylinder Head
Camshaft Timing
Oil Control Valve
Filter
Chain
Tensioner
Timing Chain
Intake
Camshaft
Journal
Exhaust
Camshaft
Journal
Camshaft Timing
Oil Control Valve
VVT-i
Oil Pan
EG-11
LUBRICATION SYSTEM
1. General
The lubrication circuit is fully pressurized and oil passes through an oil filter.
A trochoid gear type oil pump, which is driven directly by the crankshaft, is provided in the front of the
cylinder block.
The oil filter is installed diagonally downward from the side of the cylinder block to realize excellent
serviceability.
The intake camshaft is provided with a VVT-i controller, and cylinder head is provided with a camshaft
timing oil control valve. This system is operated by the engine oil.
Oil Capacity Liter (US qts, Imp qts)
Dry 4.1 (4.3, 3.6)
with Oil Filter 3.7 (3.9, 3.3)
without Oil Filter 3.4 (3.6, 3.0)
Oil Circuit 