engine TOYOTA PRIUS 2001 Service Repair Manual

BODY ELECTRICAL ± AIR CONDITIONING
182BE24Room Temperature
Sensor
182BE25
Evaporator Temperature
Sensor
182BE26
Solar Sensor
182BE27
Engine Coolant
Temperature Sensor 166
2) Room Temperature Sensor
The room temperature sensor has been pro-
vided inside the instrument finish lower panel.
The signals from this sensor are directly trans-
mitted to the air conditioning ECU.
3) Evaporator Temperature Sensor
The evaporator temperature sensor has been
provided behind the evaporator in the air
conditioning unit.
The signals from this sensor are directly trans-
mitted to the air conditioning ECU.
4) Solar Sensor
The solar sensor has been provided on top of
the instrument panel.
The signals from this sensor are directly trans-
mitted to the air conditioning ECU.
5) Engine Coolant Temperature Sensor
The water temperature sensor has been pro-
vided on the water outlet area on the left side
of the engine.
The signals from this sensor are transmitted to
the air conditioning ECU via the ECM.

BODY ELECTRICAL ± AIR CONDITIONING
182BE50
Large
Target
Damper
Opening
Angle
Small
Large Small
Tentative Damper Opening Angle167
Calculation of Required Outlet Air Temperature (TAO: Temperature Air Outlet)
After receiving the signals from the sensors and the temperature control switch setting, the air conditioning
ECU uses the formula shown below to calculate the required outlet air temperature, to regulate the servomo-
tors and blower motor. This is an outlet air temperature that is required in maintaining the set temperature
in a stable manner.
TAO=KSETx TSET±Kr x TR±KAMx TAMdisp±KsxTS+C±TCTA O = KSET x TSET ± Kr x TR ± KAM x TAMdisp ± Ks x TS + C ± TC
KSET= Setting Temperature Coefficient TSET = Setting Temperature
Kr = Room Air Temperature Coefficient TR = Room Air TemperatureKr= Room Air Temperature CoefficientTR= Room Air Temperature
K
AM= Ambient Air Temperature Coefficient TAMdisp = Ambient Air TemperatureAMppp
Ks = Solar Radiation Coefficient TS = Solar Radiation
C = Correct Constant TC = Compressor ON / OFF CorrectC= Correct ConstantTC= Compressor ON / OFF Correct
= Constant
Temperature Control System
1) Air Mix Damper Control
In response to the temperature control switch setting, the required ambient temperature, evaporator tem-
perature sensor, and engine coolant temperature sensor compensations are used by the air mix damper
control to calculate a tentative damper opening angle, through an arithmetic circuit in the air mix damper,
to arrive at a target damper opening angle.

Calculating the Target Damper Opening 

BODY ELECTRICAL ± AIR CONDITIONING
174BE06
Ex-HI
Blower
Air
Volume
LO
Low
Required Outlet
Air TemperatureHigh[C]
174BE07
HI
Calculated
Air Volume
LO
OFF[C]
Coolant Temperature (a) (b) (c) 168
Blower Control System
1) Blower Motor Startup Control
When the blower motor is started up, the blower voltage in the auto mode (low speed) is output to the
blower controller for 3 seconds. This is designed to protect the blower controller from a sudden startup
current surge.
2) Manual Control
Sets the blower speed according to operation of the blower switch.
3) Automatic Control
a. Stepless Air Volume Control
As shown on the right, when the AUTO
switch on the heater control panel is pushed,
the air conditioning ECU automatically reg-
ulates the voltage to the blower controller, in
accordance with the required outlet air tem-
perature, to deliver stepless air volume.
b. Warm-Up Control
When the coolant temperature detected by the engine coolant temperature sensor is below a predeter-
mined level and the air outlet is in the FOOT or BI-LEVEL mode, the blower does not operate. When
the coolant temperature reaches specified temperature (b), the blower motor operates at low speed.
When the coolant temperature is between specified temperature (b) to (c), the air flow calculation using
the engine coolant temperature sensor signal, and, the air flow calculation using the required outlet air
temperature are compared, and the lesser of the two is automatically selected as the air flow to be used.
When the coolant temperature reaches specified temperature (c) or more, the blower motor runs at high
speed. Moreover, when the coolant temperature is under specified temperature (a), and the warm-up
control is effected (blower motor off), the air outlet is switched to the DEF mode. Later, when the blower
motor turns on, the air outlet changes from the DEF mode to the FOOT or BI-LEVEL mode.

BODY ELECTRICAL ± AIR CONDITIONING 172
3) Refrigerant Pressure Malfunction Detection
By monitoring the pressure switch signal, this system can judge the refrigerant pressure to be abnormal,
and turns off the compressor magnetic clutch relay, if the pressure switch remains off.
4) MAX Switch ON Control
a. General
In case of usual air conditioning operation, the air conditioning system shows superior control on cool-
ing performance and fuel efficiency by combining the engine ON / OFF control by the hybrid control
and the air conditioning ON / OFF control.
In this MAX switch ON control, it controls by attaching greater importance to cooling performance of
the air conditioning.

BODY ELECTRICAL ± ACCESSORIES
182BE37 182BE36
177
Item
Outline
Right or Left Turn
GuidanceVoice guidance to instruct the direction of travel to be
taken.
Freeway Direction of
Travel GuidanceVoice guidance to instruct the direction of travel to take
on the freeway.
Guidance
Distance Display to
DestinationDisplays the distance from the present location to the
destination.
GuidanceFreeway Branch Type
Specimen GuidanceType specimen for guidance to a freeway branch.
Intersection Zoom-in
DisplayZoom-in display when approaching an intersection.
Turn List DisplayDisplays a turn list on the right side of the two-screen
display when approaching an intersection.
2) Information Screen
The information screen provides two types of indications: the energy monitor screen indication that dis-
plays the present energy flow of the hybrid system, and the fuel consumption screen indication that dis-
plays the average fuel consumption rate, the amount of regenerative energy, and the instantaneous fuel
consumption rate.
a. Energy Monitor Screen Indication
This screen indicates the energy transmis-
sion direction for checking the current drive
method (engine, motor or both), the power
generation status by the engine and status of
regenerative energy use.
b. Fuel Consumption Screen Indication
This screen indicates the average fuel con-
sumption, recovered energy and the current
fuel consumption, all at once.
The average fuel consumption is calculated
using 5-minute units. The recovered energy
over the past 5 minutes is indicated by sym-
bols, with one mark representing 50 Wh.
In addition, the total fuel consumption be-
fore resetting and the total travel distance are
displayed at the right bottom of the screen.

BODY ELECTRICAL ± ACCESSORIES
182BE43
DKUL
DKL
LSWD
Power
Window
Master
Switch
Ignition Key SW
From
BatteryIG
LSWP
LSR
KSW
DCTY
PCTY
RCTY
LCTY
HCTY
LUG
Courtesy
Switches
PKL
PKUL
Door Lock Motors
RRP D
Body
ECU
From Battery
Headlight
RelayTaillight
RelayHorn
Relay
HRLY
TRLYTo
HeadlightTo
Taillight
To
Vehicles
Horn
HR
From Battery
Interior
Light
Interior
Light
Relay
Security
Horn
Wireless
Door Control
Receiver
MPX
INDECM
Security
Indicator
185
THEFT DETERRENT SYSTEM
1. General
The theft deterrent system uses the door lock control system components and some other parts. When
somebody attempts to forcibly enter the vehicle or open the engine hood or luggage compartment door
without a key, or when the battery terminals are removed and reconnected, the theft deterrent system
sounds the vehicle's horn, security horn and flashes the headlights, taillights, hazard lights and interior
light for about one minute to alert. At the same time, it locks all the doors.
The control of this system is effected by the body ECU.

Wiring Diagram 

BODY ELECTRICAL ± ACCESSORIES
Non-Alert State
Alert State
Alert Preparation State
Alarm State
Condition (3) Condition (1)
Condition (5) Condition (2)
Condition (6)
Condition (4)
Condition (5) 186

List of Input / Output Signals 
Terminal
NameOutlineTerminal
NameOutline
DKLDriver's door key lock signalLCTYRear left door courtesy switch status
signal
DKULDriver's door key unlock signalHCTYHood courtesy switch status signal
LSWDDriver's door lock position switch
signalLUGLuggage compartment door courtesy
switch status signal
IGIgnition key switch status signalPKLFront passenger door key lock signal
LSWPFront passenger door lock position
switch signalPKULFront passenger door key unlock
signal
LSRRear left door lock position switch
signalHRLYOutput signal to headlight relay
KSWIgnition key cylinder's key
presence / absence signalTRLYOutput signal to taillight relay
DCTYDriver's door courtesy switch status
signalHROutput signal to vehicle horn relay
PCTYFront passenger door courtesy switch
status signalMPXMultiplex Communication (BEAN)
RCTYRear right door courtesy switch
status signalINDOutput signal to security indicator
2. Operation
Non-Alert State: When the security function is inactive
Without having the ignition key in the ignition key cylinder, if any one of the conditions listed below exists,
the system transfers to the alert preparation state.
Condition (1)
When the doors, engine hood, and luggage compartment door are all closed, the ignition key is used to
lock all doors.
When the doors, engine hood, and luggage compartment door are all closed, the wireless door lock re-
mote control system is used to lock all doors.
When all doors are locked, if any door, engine hood, or luggage compartment door is changed from ªcloseº
to ªopenº, and ªcloseº again, all doors, engine hood, and luggage compartment door will be locked.
Alert Preparation State: a delay time until the alert state
The system transfers to the alert state if the condition (2) listed below is met, and to the non-alert state if one
of the conditions (3) is met.

BODY ELECTRICAL ± ACCESSORIES187
Condition (2)
When the doors, engine hood, and luggage compartment door are all closed and locked, and 30 seconds
have elapsed.
Condition (3)
When one of the doors, engine hood, or luggage compartment door is changed from ªcloseº to ªopenº.
When one of the doors, engine hood, or luggage compartment door is changed from ªlockº to ªunlockº.
When the ignition key is inserted in the ignition key cylinder.
When a terminal is disconnected from the battery and re-connected.
Alert State: a state in which attempted theft can be detected
The system transfers to the alarm state if any one of the conditions (4) listed below is met, or to the non-alert
state if any one of the conditions (5) is met.
Condition (4)
Any door, engine hood, or luggage compartment door is opened.
The ignition key or the wireless door lock remote control system other than the transmitter is used for
unlocking.
The luggage compartment door is opened with something other than the ignition key.
The engine hood is opened.
A terminal is disconnected from the battery and re-connected.
The wiring harness is directly connected as if to turn the ignition switch ON.
Condition (5)
The ignition key is used to unlock the doors or the luggage compartment door.
The transmitter of the wireless door lock remote control system is used to unlock the doors.
The ignition key is inserted in the ignition key cylinder and turned until the ignition switch is ON.
Alarm State: a state in which attempted theft can be detected
When an attempted theft is detected, the system sounds the vehicle's horn and the security horn, flashes
the headlights, taillights, and hazard lights, and illuminates the interior light to alert the people in the area.
If any one of the doors is unlocked, and the ignition key is not inserted in the ignition key cylinder, the
system forcefully locks the doors once.
The system transfers to the alert state if the condition (6) described below is met, or, when the system is
in the alarm state, it transfers to the non-alert state if any one of the conditions (5) described above is met.
At this time, the taillights are illuminated for 2 seconds to inform the driver that an attempted theft has been
detected.
Condition (6)
After approximately 60 seconds of the alarm time have elapsed.

BODY ELECTRICAL ± ACCESSORIES
182BE46
Cruise Control Switch Signal
Brake Cancel Signal
(Stoplight Switch)
Accelerator Opening Angle Signal
(Accelerator Pedal Position Sensor)
Shift Position Signal
(Sift Position Sensor)
Brake ECUHV ECU
Cruise Control Area

Switch Input Value

Processing

Required Vehicle Speed

Calculation
Hybrid Control Area

Required Torque

Calculation

Drive Force Distribution

between Engine and
Electric Motor
Indicator Light
ECM
Inverter189
CRUISE CONTROL SYSTEM
1. General
The Prius has adopted a cruise control system that uses the hybrid system, and it is offered as an option. This
system, which is controlled by the HV ECU that is integrated with the cruise control ECU, operates the ve-
hicle through an optimal combination of the drive forces of the electric motor and the engine in accordance
with the setting on the cruise control switch.
2. Construction
The cruise control system mainly consists of an HV ECU, cruise control switches, indicator, stoplight switch,
accelerator pedal position sensor, and the shift position sensor.
The table below shows each of the functions.
Item
Function
HV ECUControls all the functions of the cruise control system in accordance with the
signals from the sensors.
Cruise Control Main
SwitchCruise control system's ON / OFF signal requirement.
Cruise Control Switch
A three-directional switch that provides the SET / COAST, RESUME /
ACCEL, and CANCEL functions. It requires the functions and settings in
accordance with its operations.
Indicator LightIt is provided in the combination meter to display whether the system is ON
or OFF.
Stop Light SwitchDetects that the driver has stepped on the brake pedal.
Accelerator Pedal
Position SensorDetects the accelerator pedal opening angle.
Shift Position SensorDetects the shift position.

APPENDIX
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10
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30
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45
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55
60
65
70
Area
Item
Major Dimensions & Vehicle Weights Performance Engine Engine
Chassis
Electrical
192
MAJOR TECHNICAL SPECIFICATIONS
U.S.A. and CanadaBody Type4-Door SedanVehicle GradeÐModel CodeNHW11L-AEEEBANHW11L-AEEEBKLength mm (in.)4305 (169.5)u
OverallWidth mm (in.)1695 (66.7)uOverallHeight mm (in.)1465 (57.6)uWheel Base mm (in.)2550 (100.4)u
TreadFront mm (in.)1475 (58.1)uTreadRear mm (in.)1480 (58.3)u
Effective Head RoomFront mm (in.)985 (38.8)uEffective Head RoomRear mm (in.)942 (37.1)u
Effective Leg RoomFront mm (in.)1047 (41.2)uEffective Leg RoomRear mm (in.)899 (35.4)u
Shoulder RoomFront mm (in.)1342 (52.8)uShoulder RoomRear mm (in.)1325 (52.2)u
OverhangFront mm (in.)815 (32.1)uOverhangRear mm (in.)940 (37.0)uMin. Running Ground Clearance mm (in.)125 (4.9)uAngle of Approach degrees145uAngle of Departure degrees225uFront kg (lb)770 (1700)u
Curb WeightRear kg (lb)485 (1065)uCurb WeightTotal kg (lb)1255 (1765)uFront kg (lb)890 (1965)u
Gross Vehicle WeightRear kg (lb)750 (1650)uGross Vehicle WeightTotal kg (lb)1640 (3615)uFuel Tank Capacity
(US. gal., lmp.gal.)45* (11.9, 9.9)uLuggage Compartment Capacity m3 (cu.ft.)0.39 (137.7)uMax. Speed km/h (mph)160 (99.4)uMax. Cruising Speed km/h (mph)160 (99.4)u
Acceleration0 to 100 km/h sec.12.7uAcceleration0 to 400 m sec.19.0u1st Gear km/h (mph)ÐÐ
Max. Permissible2nd Gear km/h (mph)ÐÐMax. Permissible
Speed3rd Gear km/h (mph)ÐÐp
4th Gear km/h (mph)ÐÐ
Min. Turning RadiusWall to Wall m (ft.)10.2 (33.5)uMin. Turning Radius
(Outside Front)Curb to Curb m (ft.)9.4 (30.8)uEngine Type1NZ-FXEuValve Mechanism16-Valve, DOHCuBore y Stroke mm (in.)75.0 y 84.7 (2.95 y 3.33)uDisplacement cm3 (cu.in.)1497 (91.4)uCompression Ratio13.0uCarburetor TypeSFIuResearch Octane No. RON95uMax. Output (EEC) kW/rpm (HP@rpm)52/4500 (70@4500)uMax. Torque (EEC) N´m/rpm (lb-ft@rpm)111/4200 (82@4200)uBattery Capacity (5HR) Voltage & Amp. Hr.12 ± 28uAlternator Output WattsÐÐStarter Output kWÐÐClutch TypeÐÐTransaxle TypeP111uIn FirstÐÐIn SecondÐÐ
Transmission GearIn ThirdÐÐTransmission Gear
RatioIn FourthÐÐIn FifthÐÐIn ReverseÐÐCounter Gear RatioÐÐDifferential Gear Ratio (Final)3.905u
Brake TypeFrontVentilated DiscuBrake TypeRearL.T. DrumuParking Brake TypeL.T. DrumuBrake Booster Type and Size in.HydraulicuProportioning Valve TypeP-Valveu
Suspension TypeFrontMacPherson StrutuSuspension TypeRearTorsion Beanu
Stabilizer BarFrontSTDuStabilizer BarRearSTDuSteering Gear TypeRack and PinionuSteering Gear Ratio (Overall)16.4~18.3uPower Steering TypeElectric Motoru
*: EPA / CARB ORVR Test conditions