oil pump TOYOTA PRIUS 2001 Service User Guide

ENGINE ± 1NZ-FXE ENGINE
182EG25
Engine Load
Full Load Performance
Range 4Range 5
Range 3
Range 2
Range 1Engine Speed
TDC
EXIN
BDCLatest
timing
To retard
side
IN
EX
To advance
side
EX IN71
In proportion to the engine speed, intake air volume, throttle position and water temperature, the ECM cal-
culates an optimal valve timing under each driving condition and control the camshaft timing oil control
valve. In addition, ECM uses signal from the camshaft position sensor and the crankshaft position sensor
to detect the actual valve timing, thus performing feedback control to achieve the target valve timing.

Operation During Various Driving Condition (Conceptual Diagram) 
Operation StateRangeValve TimingObjectiveEffect
During Idling1
182EG26
Eliminating overlap to
reduce blow back to the
intake sideStabilized
idling rpm
Better fuel
economy
At Light Load2
182EG27
Decreasing overlap to
eliminate blow back to
the intake sideEnsured
engine
stability
At Medium
load3
182EG28
Increasing overlap to
increase internal EGR for
pumping loss elimination
Better fuel
economy
Improved
emission
control

CHASSIS ± P111 HYBRID TRANSAXLE
CHASSIS
182CH01
MG (Motor Generator) 2Power Splitting Device
MG (Motor Generator) 1
Transaxle Damper
Differential Oil Pump79
P111 HYBRID TRANSAXLE
DESCRIPTION
The P111 hybrid transaxle has been newly developed for the hybrid system application.
Containing a MG (Motor Generator) 2 for driving the vehicle and a MG (Motor Generator) 1 for generating
electrical power, the P111 hybrid transaxle uses a continuously variable transmission mechanism with power
splitting device that achieve smooth and quiet operation.

Specifications 
Pl t
The No. of Ring Gear Teeth78
Planetary
GearThe No. of Pinion Gear Teeth23Gear
The No. of Sun Gear Teeth30
Gear Ratio3.905
Number of Links74
ChainDrive Sprocket39
Driven Sprocket36
Counter GearDrive Gear30Counter GearDriven Gear44
Final GearDrive Gear26Final GearDriven Gear75
Fluid Capacity Liters (US qts, Imp.qts)4.6 (4.9, 4.0)
Fluid TypeATF Type T-IV or equivalent

CHASSIS ± P111 HYBRID TRANSAXLE
182CH02
Power Splitting Device
Transaxle
Damper
MG2
Sun Gear
Carrier
Ring GearMG1
Oil Pump
Silent ChainEngine
Counter Gears
Final Gears
182CH03
Coil Spring
Drive force
from the
engine 80
TRANSAXLE UNIT
1. General
The transaxle unit consists primarily of a transaxle damper, MG (Motor Generator) 1, MG2, power splitting
device and a reduction unit (containing a silent chain, counter gears, and final gears).
2. Transaxle Damper

A coil-spring type damper with low-twist char-
acteristics has been adopted as the mechanism
to transmit the drive force from the engine.

A torque fluctuation absorbing mechanism that
uses a dry-type single-plate friction material
has been adopted.

CHASSIS ± P111 HYBRID TRANSAXLE
182CH77 182CH06
Planetary
Gear UnitRing Gear
Carrier
Sun Gear
MG2
Oil PumpMG1
Transaxle
Damper
Engine
Chain
Counter Gear
Final Gear
MG2
Engine Output Shaft
MG1
182CH08
182CH07
HV Battery
Inverter
MG2 MG1
Engine : Flow of
: motive force
: Flow of
: electrical force
Discharge
Reactive
Control: Torque
: MG2
: Torque
Sun GearCarrier Ring Gear
rpm
MG1 Engine MG2
Nomographic Chart of Planetary
Gear Unit
82
5. Power Splitting Device
General
Planetary gear unit is used for a power splitting device.
As part of the planetary gear unit, the sun gear is connected to MG1, the ring gear is connected to MG2,
and the carrier is connected to the engine output shaft. The motive force is transmitted via the chain to the
counter drive gear.
Item
Connection
Sun GearMG1
Ring GearMG2
CarrierEngine Output Shaft
Operation
1) Starting the Engine
Both while the vehicle is stopped and is in motion, the starting of the engine is performed by MG1. Be-
cause the motive force is transmitted at this time to the ring gear in the planetary gear unit, an electrical
current is applied to MG2 to cancel out the motive force (reactive control).
The nomographic chart below gives a visual representation of the planetary gear's rotational direction,
rotational speed, and power balance. In the nomographic chart, the rpm of the 3 gears maintain a relation-
ship in which they are invariably joined by a direct line.

CHASSIS ± P111 HYBRID TRANSAXLE
182CH22
Oil Pump Drive
Shaft
Oil Pump Drive
Rotor
Oil Pump
Driven
Rotor
182CH23
182CH24
Parking Gear
Parking
Lock
Pawl
Link 1
Link 2
ªAº View Link 2
Parking Rod
Parking
Lock
Pawl ªAº View87

LUBRICATION SYSTEM
A force-feed lubrication system using a trocoid
pump has been adopted for lubrication of the plan-
etary gear unit and the bearings on the main shaft.
The oil pump is directly driven by the engine.
The same type of oil is used for both the reduction
unit portion and the differential portion.

PARKING LOCK MECHANISM
A mechanical parking lock mechanism has been
provided in the counter driven gear.
The engagement of the parking lock pawl with the
parking gear that is integrated with the counter
driven gear locks the movement of the vehicle.
The direction of the parking lock pawl changes via
the two link mechanisms that are connected to the
outer lever through the shift cable. The longitudi-
nal movement of the parking rod causes a vertical
movement of the parking lock pawl that meshes
with the parking gear.

BODY ELECTRICAL ± AIR CONDITIONING 152
AIR CONDITIONING
DESCRIPTION
The air conditioning system in the Prius has the following features:
Both heating and demisting performances are realized by adopting performances are realized by adopting
the 2-way flow heater type air conditioning unit.
A multi-tank, super-slim structure evaporator has been adopted.
An automatic air conditioning system which provides enhanced air conditioning comfort according to the
occupant's senses has been adopted.
A semi-center location air conditioning unit, in which the evaporator and heater core are placed in the ve-
hicle's longitudinal direction, has been adopted.
A compact, high-performance scroll compressor with oil separator has been adopted.
The heat exchange efficiency has been improved through the adoption of the sub-cool condenser.
This condenser is integrated with the radiator to minimize the space they occupy in the engine compart-
ment.
A compact, lightweight, and highly efficient straight flow (full-path flow) aluminium heater core has been
adopted.
This heater core is integrated with a PTC (Positive Temperature Coefficient) heater, which excels in heat-
ing performance.
PTC heaters have been provided in the air duct at the footwell outlet in front of the air conditioning unit.
However, air conditioning without the PTC heaters is offered as an option on the U.S.A. models.
An electrical water pump with a bypass valve that provides a stable heater performance even if the engine
is stopped due to a function of the THS (TOYOTA Hybrid System) has been adopted.
A clean air filter that excels in removing pollen and dust is standard equipment.

BODY ELECTRICAL ± AIR CONDITIONING
165BE26165BE25
Discharge Port
Discharge Service Port
Pipe
Oil Discharge Hole
Shutter
Oil Storage Chamber
Discharge ValveRefrigerant and
Compressor OilRefrigerant
Compressor
Oil
182BE20182BE19
Flow of Coolant
Bypass Valve
Water Pump OFF
(Engine ON)Bypass Valve
Water Pump ON
(Engine OFF)Flow of Coolant163
2) Construction and Operation
The refrigerant gas that is discharged from the discharge port flows by rotating around the cylindrical
pipe in the oil separator. At this time, the centrifugal force that is created during the rotation separates
the refrigerant gas and the compressor oil due to the difference in their specific gravity. The refrigerant
gas with the lighter specific gravity passes through the inside of the pipe and travels from the discharge
service port to the outside of the compressor. The compressor oil with the heavier specific gravity is dis-
charged through the oil discharge hole in the shutter and is stored in the oil storage chamber. Then, the
compressor oil is fed again into the compressor and circulates inside the compressor.
4. Water Pump (For Air Conditioning)
An electrical water pump with a bypass valve that provides a stable heater performance even if the engine
is stopped due to a function of the THS has been adopted.
When the engine is running, this water pump ceases its operation and opens the bypass valve to minimize
the flow resistance of the coolant that is pumped by the engine water pump.

SS102±07
SS±12
± SERVICE SPECIFICATIONSSFI
134 Author: Date:
2001 PRIUS (RM778U)
SFI
SERVICE DATA
Fuel pumpResistance at 20°C (68°F)0.2 ± 3.0 W
InjectorResistance at 21 °C (68 °F)
Injection volume
Difference between each cylinder
Fuel leakage13.4 ± 14.2 W
36 ± 46 cm3 (2.1 ± 2.8 cu in.) per 15 sec.
10 cm3 (0.7 cu in.) or less
1 drop or less per 12 minutes
Mass air flow me-
ter
Resistance
at ±20°C (±4°F) THA ± E2
at 20°C (68°F) THA ± E2
at 60°C (140°F) THA ± E2
13.6 ± 18.4 kW
2.21 ± 2.69 kW
0.49 ± 0.67 kW
Throttle control
motorResistance
at 20°C (68°F) M+ ± M±
0.3 ± 100 W
Throttle position
sensorResistance
at 20°C (68°F) VC ± E2
1.2 ± 3.2 kW
VSV for EVAPResistance at 20°C (68°F)27 ± 33 W
VSV for CCVResistance at 20°C (68°F)25 ± 30 W
VSV for Purge
flow switching
valve
Resistance at 20°C (68°F)33 ± 39 W
VSV for HCACResistance at 20°C (68°F)33 ± 39 W
ECT sensorResistance at ±20°C (±4°F)
at 0°C (32°F)
at 20°C (68°F)
at 40°C (104°F)
at 60°C (140°F)
at 80°C (176°F)10 ± 20 kW
4 ± 7 kW
2 ± 3 kW
0.9 ± 1.3 kW
0.4 ± 0.7 kW
0.2 ± 0.4 kW
Vacuum sensor
for HCACPower sorce voltage4.5 ± 5.5 V
Vapor pressure
sevsorPower sorce voltage
Output voltage4.5 ± 5.5 V
3.0 ± 3.6 V
Heated
oxygen sensorHeater coil resistance at 20°C (68°F)11 ± 16 W
Accelerator pedal
position sensorResistance
at 20°C (68°F) Vcp
1 ± Ep1
Vcp2 ± Ep21.5 ± 6.0 kW
Fuel cut rpmFuel return rpm1,400 rpm

SS103±06
± SERVICE SPECIFICATIONSSFI
SS±13
2001 PRIUS (RM778U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Fuel pump assembly x Fuel tank4.04035 in.´lbf
Delivery pipe x Cylinder head1919414
Throttle body x Intake manifold2020415
Camshaft timing oil control valve x Cylinder head7.57666 in.´lbf
Knock sensor x Cylinder block4445033
Heated oxygen sensor (Bank1 sensor1) x Exhaust manifold4444031
Heated oxygen sensor (Bank1 sensor2) x Exhaust pipe4444031

SS178±01
SS±16
± SERVICE SPECIFICATIONSLUBRICATION
138 Author: Date:
2001 PRIUS (RM778U)
LUBRICATION
SERVICE DATA
Oil pressureat idle speed
at 3,000 rpm29 kPa (0.3 kgf/cm2,4.3 psi) or more
150 ± 550 kPa (1.5 ± 5.6 kgf/cm2, 22 ± 80 psi)
Oil pump
Side clearance STD
Maximum
Tip clearance STD
Maximum
Body clearance STD
Maximum0.03 ± 0.09 mm (0.0012 ± 0.0035 in.)
0.15 mm (0.0059 in.)
0.060 ± 0.180 mm (0.0024 ± 0.0071 in.)
0.28 mm (0.0110 in.)
0.250 ± 0.325 mm (0.00984 ± 0.01280 in.)
0.425 mm (0.01673 in.)