2001 TOYOTA PRIUS air condition

NEW MODEL OUTLINE
MAIN EQUIPMENT
182MO23(For U.S.A.)
Glove box Accesory box Multi-box
Front door pocket
Seat back pocket
(Driver's and
passenger seat)
182MO24182MO09
182MO25
Small storage box
Cup holder
(for two caps use)11.839ft3 (by SAE suitcase method)
luggage space is secured.182MO26182MO27182MO28
18
Air Conditioning
An automatic air conditioning has been adopted
in consideration to ease of use.

A clean air filter which removes pollen and
dust is included as a standard fitting for puri-
fying the air inside the cab.

Two air conditioning modes, A/C for eco-
nomical air conditioning and MAX for espe-
cially strong air conditioning, are provided.
Wireless Door Lock Remote Control System
With the wireless door lock remote control system, all the doors can be locked and unlocked by signals emitted
by the transmitter.
Power Window System
A power window system which enables all windows to be raised or lowered with switches has been adopted.
An auto up/down function and jam protection function have been added to the driver's power window.
HV Immobiliser System
HV immobiliser system will not allow the HV system to be started by duplicate key is used. This system
will permit the HV system to be started only when the ID code of the transponder chip impregnated in the
key matches the ID code registered beforehand in the transponder key amplifier.
Theft Deterrent System
When an attempt is made to forcibly enter the vehicle or open the hood or trunk lid without a key, or when
the battery terminals are removed and reconnected, this system sounds the horn and flashes the headlights,
taillights and emergency flashers for about 1 minute to alert the owner. At the same time, it locks all the
doors.
Storage Space
Ample storage space with an emphasis on practicality provided throughout the Prius.
Instrument panel (passenger seat)Seat back pocketFront door pocket
Center console boxLuggage space

ENGINE ± 1NZ-FXE ENGINE62
ENGINE CONTROL SYSTEM
1. General
The engine control system for the 1NZ-FXE engine has following system.
System
Outline
SFI
Sequential Multiport
Fuel InjectionAn L-type SFI system directly detects the intake air volume with a hot-wire
type mass air flow meter.
ESA
Electronic Spark
AdvanceIgnition timing is determined by the ECM based on signals from various
sensors. The ECM corrects ignition timing in response to engine knocking.
VVT-i
Variable Valve
Timing-intelligentControls the intake camshaft to an optimal valve timing in accordance with
the engine condition.
ETCS-i
Electronic
Throttle Control
System-intelligentOptimally controls the throttle valve opening in accordance with the ECM,
and the conditions of the engine and the vehicle, and comprehensively
controls the ISC and cruise control system.
Fuel Pump Control
Fuel pump operation is controlled by signal from the ECM.

To stop the fuel pump during operation of the SRS airbag.
Oxygen Sensor Heater
ControlMaintains the temperature of the oxygen sensors at an appropriate level to
increase accuracy of detection of the oxygen concentration in the exhaust gas.
Evaporative Emission
Control

The ECM controls the purge flow of evaporative emissions (HC) in the
charcoal canister in accordance with engine conditions.

Using 3 VSVs and a vapor pressure sensor, the ECM detects any
evaporative emission leakage occurring between the fuel tank and the
charcoal canister, and vapor reducing fuel tank through the changes in the
tank pressure. For details, see page 79.
Toyota HCAC System
The ECM controls the VSV (for Toyota HCAC System) to improve the clean
emission performance of the exhaust gas when the temperature of the TWC
is low. For details, see page 58.
Air Conditioning
Cut-Off ControlBy turning the air conditioning compressor OFF in accordance with the
engine condition, drivability is maintained.
Cooling Fan ControlRadiator cooling fan operation is controlled by signals from ECM based on
the engine coolant temperature sensor signal (THW).
HV Immobiliser
Prohibits fuel delivery, ignition, and starting the HV system if an attempt is
made to start the HV system with an invalid ignition key. For details, see page
80.
DiagnosisWhen the ECM detects a malfunction, the ECM diagnoses and memorizes
the failed section.
Fail-SafeWhen the ECM detects a malfunction, the ECM stops or controls the engine
according to the data already stored in memory.

ENGINE ± 1NZ-FXE ENGINE
ECM
EFI MAIN RELAY BATTERY+B BATT, BM
HTE
ETH
SPHV
ESTP
GO HV ECU
(Hybrid Vehicle Control ECU)
VACUUM SENSOR
(for TOYOTA HCAC SYSTEM)ACCELERATOR PEDAL
POSITION SENSORHCLS
VAPOR PRESSURE SENSORPTNK VPA 1, 2
DATA LINK CONNECTOR 3SIL
TC
AIR CONDITIONING ECU AIR CONDITIONING CUT-
OFF CONTROL
ACT
COOLING FAN RELAYCOOLING FAN
CONTROLFA N
VSV (for EVAP) EVAP CONTROLEVP1
VSV (for CANISTER
CLOSED VALVE) CCV
VSV (for PURGE FLOW
SWITCHING VALVE)TBP
METER ECU
AIR CONDITIONING ECU
DISPLAY ECU
BODY ECU
VSV
(for TOYOTA HCAC SYSTEM)
EFI MAIN RELAY
MALFUNCTION INDICATOR
LAMP MPX1
NEO
MPX2
HCC
MREL
W
64

ENGINE ± 1NZ-FXE ENGINE
182EG24
VVT-i Controller
ECM
Camshaft Position
Sensor
Camshaft Timing
Oil Control Valve Crankshaft
Position
Sensor67
5. Main Components of Engine Control System
The main components of the 1NZ-FXE engine control system are as follows:
Components
OutlineQuantity
Mass Air Flow MeterHot-Wire Type1
Crankshaft Position Sensor (Rotor's Teeth)Pick-Up Coil Type (36-2)1
Camshaft Position Sensor (Rotor's Teeth)Pick-Up Coil Type (3)1
Throttle Position SensorLinear Type (Double)1
Knock SensorBuilt-In Piezoelectric Element Type1
Oxygen Sensor
Heated Oxygen Sensor
(Bank 1, Sensor 1)
(Bank 1, Sensor 2)
2
Injector12-Hole Type4
6. VVT-i (Variable Valve Timing-intelligent) System
General
The VVT-i system is designed to control the intake camshaft within a wide range of 43 (of crankshaft
angle) to provide a valve timing that is optimally suited to the engine condition, thus realizing improved
torque in all the speed ranges and fuel economy, and reduce exhaust emissions.

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

ENGINE ± 1NZ-FXE ENGINE
150EG39150EG40
Close
Open
VC VTA1 VTA2 E2V
5
0 Close
Output Voltage
Open VTA1 VTA2
Accelerator Pedal Depressed Angle75
2) Throttle Position Sensor
The throttle position sensor is mounted on the throttle body.
The throttle position sensor converts the amount of accelerator pedal effort into two types of electrical
signals with distinct output characteristics. The signals are then input into the ECM.
3) Throttle Control Motor
A DC motor with excellent response and minimal power consumption is used for the throttle control mo-
tor. The ECM performs the duty ratio control of the direction and the amperage of the current that flows
to the throttle control motor in order to regulate the opening angle of the throttle valve.
Operation
The ECM drives the throttle control motor by determining the target throttle valve opening in accordance
with the respective operating condition.
1) Idle Speed Control
The idle speed control is effected entirely by the ETCS-i. The following are the contents of the control:
idle-up control during cold engine operation, intake air volume control to improve the startability of the
engine, and control for when the electrical load changes such as when the air conditioning switch is turned
ON or OFF.
2) Cruise Control
Through the adoption of the ETCS-i, the vehicle speed is now controlled by the throttle control motor,
which controls the throttle valve.

ENGINE ± 1NZ-FXE ENGINE 76
Fail Safe
If an abnormal condition occurs with the ETCS-i, the check engine warning light in the combination meter
illuminates to alert the driver. The current to the throttle control motor is cut off to prevent the ETCS-i from
operating. This enables the return spring to close the throttle valve.
Diagnosis
If the diagnostic trouble code 89 is being output to the combination meter check engine warning light, it
means that the ECM has detected a malfunction in the ETCS-i, and outputs the diagnostic trouble code of
the ETCS-i.
Also, the diagnostic trouble code can be output to a hand-held tester via the data link connector 3.
For details, refer to the 2001 Prius Repair Manual (Pub. No.RM778U).

THS (TOYOTA HYBRID SYSTEM)
182TH24
ªREADYº LightOutput Control
Warning Light 26
DRIVING CHARACTERISTICS
Because the Prius uses a parallel series hybrid system, some aspects of its operation may differ from those of
existing automobiles, and may require precautions that are unique to this system.
1. Starting the THS
Make sure that the parking brake is engaged and that the shift lever is in the P position.
While depressing the brake pedal, turn the ignition switch to the START position. After this, the ªREADYº
light flashes.
The engine does not start when the shift lever is in the N position; it can only start in the P position. When
the external air temperature is low, the ªREADYº light may flash longer than usual.
As soon as the engine has started, the ªREADYº light illuminates steadily and a beeping sound is heard.
Several seconds after the engine warms up, the engine stops automatically, provided that the air conditioning
compressor does not need to operate and that the HV battery maintains a proper SOC (state of charge).
2. Start-Off
While keeping the brake pedal depressed, release
the parking brake, and move the shift lever to the
D position.
The vehicle has the same creeping movement as
the conventional automatic transmission vehicles.
Gradually release the brake pedal and slowly de-
press the accelerator pedal to start off.
At this time, the vehicle starts off powered only by
the MG2 (Motor Generator No.2)
NOTICE: The vehicle can be started off, provided that the ªREADYº light remains illuminated, even
if the engine remains stopped.
3. Acceleration
Depress the accelerator pedal to accelerate the vehicle.
If the engine remained stopped during start-off, the engine will start automatically during acceleration.
4. Downhill Driving
Move the shift lever to the B position as necessary in order to simultaneously apply the regenerative brake
and the engine friction brake.
5. Deceleration and Stopping
Depress the brake pedal to decelerate and to stop the vehicle.
Depressing the brake pedal causes the regenerative brake to activate automatically in the D or B position. (In
the regenerative brake system, kinetic energy is converted to electrical energy.) If the engine has warmed up,
the air conditioning compressor does not need to operate, and if the HV battery maintains a proper SOC (state
of charge), the engine stops automatically when the vehicle speed drops-even if the vehicle comes to a stop.
6. Parking
Push down the parking brake pedal, move the shift lever to the P position, and pull out the ignition key.
NOTICE: Make sure to pull out the ignition key after parking the vehicle because the vehicle can be
driven as long as the ªREADYº light remains illuminated even if the engine is stopped.
7. Other Characteristics and Precautions

If a drive wheel slips on slippery terrain, causing the front wheels to spin faster than the rear wheels, the
THS effects control to limit the slippage by restraining the drive force. (This also protects the planetary
gear from damage.)

When the HV battery temperature is too high or low, the output control warning light illuminates, alerting
the driver that output power may be limited.
This is not 2 malfunction. This condition may be corrected by avoiding sudden acceleration /decelaration,
after which the light will go out.

When the vehicle is stopped and the shift lever is in the N position, electricity is not generated even if the
engine is running. If the vehicle remains stopped for a long time, make sure to move the shift lever to the
P position. In heavy traffic, keep the shift lever in the D position.