2001 TOYOTA PRIUS coolant level

2001 PRIUS (EWD414U)
G ELECTRICAL WIRING ROUTING
Position of Parts in Engine Compartment
A 1 A/C Condenser Fan Motor
A 2 A/C Magnetic Clutch and Lock Sensor
A 3 A/C Triple Pressure SW
(A/C Dual and Single Pressure SW)
A 4 ABS Speed Sensor Front LH
A 5 ABS Speed Sensor Front RH
A 6 Ambient Temp. Sensor
B 1 Brake Actuator
B 2 Brake Actuator
B 3 Brake Actuator
B 4 Brake Fluid Level Warning SW
C 1 Camshaft Position Sensor
C 2 Camshaft Timing Oil Control Valve
C 3 Circuit Breaker Sensor
C 4 Converter
C 5 Converter
C 6 Crankshaft Position Sensor
D 1 DC Motor
E 1 Engine Coolant Temp. Sensor
E 2 Engine Hood Courtesy SWF 1 Front Airbag Sensor LH
F 2 Front Airbag Sensor RH
F 3 Front Parking Light LH
F 4 Front Parking Light RH
F 5 Front Side Marker Light LH
F 6 Front Side Marker Light RH
F 7 Front Turn Signal Light LH
F 8 Front Turn Signal Light RH
F 9 Front Wiper Motor
F 10 Fusible Link Block No.1
F 11 Fusible Link Block No.1
F 12 Fusible Link Block No.1
F 13 Fusible Link Block No.1
H 1 Headlight LH
H 2 Headlight RH
H 3 Heated Oxygen Sensor (Bank 1 Sensor1)
H 4 Horn
H 5 Hydraulic Booster
H 6 Hydraulic Booster

L PART NUMBER OF CONNECTORS
Code Part Name Part NumberCodePart Name Part Number
Note : Not all of the above part numbers of the connector are established for the supply.
2001 PRIUS (EWD414U) A 1
A/C Condenser Fan Motor90980±11237
A 2A/C Magnetic Clutch and Lock Sensor90980±10942
A 3A/C Triple Pressure SW (A/C Dual and
Single Pressure SW)90980±10943
A 4ABS Speed Sensor Front LH90980±11003A 5ABS Speed Sensor Front RH90980±11003
A 6Ambient Temp. Sensor90980±11070
A 7A/C Amplifier90980±11911
A 8A/C Amplifier90980±11913
A 9A/C Amplifier90980±11927
A10A/C Room Temp. Sensor
A11A/C Solar Sensor90980±11919
A12A/C Thermistor
A13Accel Position Sensor90980±11144
A14Air Inlet Control Servo Motor90980±11921
A15Air Mix Control Servo Motor90980±11909A16Air Vent Mode Control Servo Motor90980±11909
A17Airbag Sensor Assembly90980±11869
A18Airbag Sensor Assembly90980±11872
A19Airbag Sensor Assembly90980±11867
A20Airbag Squib (Front Passenger Airbag
Assembly)90980±11884
A21Airbag Squib (Steering Wheel Pad)90980±10850
A22Ashtray Illumination90980±12111
A23ABS Speed Sensor Rear LH90980±11060A24ABS Speed Sensor Rear RH90980±11060
B 1Brake Actuator90980±11087
B 2Brake Actuator90980±11161
B 3Brake Actuator90980±11698
B 4Brake Fluid Level Warning SW90980±11207
B 5Back±Up Light Relay82660±20340
B 6Blower Motor90980±10214
B 7Blower Motor Linear Controller90980±11676
B 8Body ECU90980±11971
B 9Body ECU90980±11973
B10Brake ECU90980±11935
B11Brake ECU90980±11476
B12Brake ECU90980±11637
B13Brake ECU90980±11638
B14Brake Warning Buzzer90980±10906
B15Battery Blower Motor82824±47130
B16Battery Blower Motor Controller90980±11676
B17Battery ECU90980±11392
B18Battery ECU90980±11424
B19Battery Fan Relay82660±20340
B20Buckle SW and Tension Reducer LH
B21Buckle SW RH and Seat Belt Warning
Occupant Detection Sensor90980±11471
C 1Camshaft Position Sensor90980±10947
C 2Camshaft Timing Oil Control Valve90980±11162
C 3Circuit Breaker Sensor90980±11898
C 4Converter90980±10942
C 5Converter90980±11963
C 6Crankshaft Position Sensor90980±12028
C 7Center Cluster SW90980±10801
C 8Cigarette Lighter90980±10760
C 9Cigarette Lighter Illumination90980±11148
C10Combination Meter90980±11927
C11Combination Meter90980±11923
C12Combination SW90980±11594
C13Combination SW90980±11672
C14Combination SW90980±11616
D 1DC Motor90980±10838
D 2Data Link Connector 390980±11665
D 3Daytime Running Light Relay90980±12034
D 4Diode (Door Courtesy)90980±11251
D 5Diode (Daytime Running Light)90980±10962
D 6Door Courtesy SW Front LH
D 7Door Courtesy SW Front RH90980±10871D 8Door Courtesy SW Rear LH90980±10871
D 9Door Courtesy SW Rear RH
D10Door Lock Control SW Front RH90980±10797
D11Door Lock Motor and Door Unlock
Detection SW Rear LH
90980±11150
D12Door Lock Motor and Door Unlock
Detection SW Rear RH90980±11 150
D13Door Lock Motor, Door Key Lock and
Unlock SW and Door Unlock Detection SW
Front LH
90980±11858
D14Door Lock Motor, Door Key Lock and
Unlock SW and Door Unlock Detection SW
Front RH90980±11 858
E 1Engine Coolant Temp. Sensor90980±10737
E 2Engine Hood Courtesy SW90980±11189
E 3EMPS ECU90980±12012
E 4EMPS ECU90980±11579
E 5EMPS ECU90980±12120
E 6EMPS ECU90980±11923
E 7Engine Control Module90980±11421
E 8Engine Control Module90980±11476
E 9Engine Control Module90980±11637

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.

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.

IN0CI±02
± INTRODUCTIONTERMS
IN±51
2001 PRIUS (RM778U)
GLOSSARY OF SAE AND TOYOTA TERMS
This glossary lists all SAE±J1930 terms and abbreviations used in this manual in compliance with SAE rec-
ommendations, as well as their TOYOTA equivalents.
SAE
ABBREVIATIONSSAE TERMSTOYOTA TERMS
( )±±ABBREVIATIONS
A/CAir ConditioningAir Conditioner
ACLAir CleanerAir Cleaner, A/CL
AIRSecondary Air InjectionAir Injection (AI)
APAccelerator Pedal±
B+Battery Positive Voltage+B, Battery Voltage
BAROBarometric PressureHAC
CACCharge Air CoolerIntercooler
CARBCarburetorCarburetor
CFIContinuous Fuel Injection±
CKPCrankshaft PositionCrank Angle
CLClosed LoopClosed Loop
CMPCamshaft PositionCam Angle
CPPClutch Pedal Position±
CTOXContinuous Trap Oxidizer±
CTPClosed Throttle PositionLL ON, Idle ON
DFIDirect Fuel Injection (Diesel)Direct Injection (DI)
DIDistributor Ignition±
DLC1
DLC2
DLC3Data Link Connector 1
Data Link Connector 2
Data Link Connector 31: Check Connector
2: Total Diagnosis Comunication Link (TDCL)
3: OBD II Diagnostic Connector
DTCDiagnostic Trouble CodeDiagnostic Code
DTMDiagnostic Test Mode±
ECLEngine Control Level±
ECMEngine Control ModuleEngine ECU (Electronic Control Unit)
ECTEngine Coolant TemperatureCoolant Temperature, Water Temperature (THW)
EEPROMElectrically Erasable Programmable Read Only Memory
Electrically Erasable Programmable Read Only Memory
(EEPROM),
Erasable Programmable Read Only Memory (EPROM)
EFEEarly Fuel EvaporationCold Mixture Heater (CMH), Heat Control Valve (HCV)
EGRExhaust Gas RecirculationExhaust Gas Recirculation (EGR)
EIElectronic IgnitionTOYOTA Distributorless Ignition (TDI)
EMEngine ModificationEngine Modification (EM)
EPROMErasable Programmable Read Only MemoryProgrammable Read Only Memory (PROM)
EVAPEvaporative EmissionEvaporative Emission Control (EVAP)
FCFan Control±
FEEPROMFlash Electrically Erasable Programmable
Read Only Memory±
FEPROMFlash Erasable Programmable Read Only Memory±
FFFlexible Fuel±
FPFuel PumpFuel Pump
GENGeneratorAlternator
GNDGroundGround (GND)

MA02G±02
MA±4
± MAINTENANCEUNDER HOOD
57 Author: Date:
2001 PRIUS (RM778U)
UNDER HOOD
GENERAL MAINTENANCE
1. GENERAL NOTES

Maintenance items may vary from country to country. Check the owner's manual supplement in which
the maintenance schedule is shown.

Every serice item in the periodic maintenance schedule must be performed.

Periodic maintenance service must be performed according to whichever interval in the periodic main-
tenance schedule occurs first, the odometer reading (miles) or the time interval (months).

Maintenance service after the last period should be performed at the same interval as before unless
otherwise noted.
2. WINDSHIELD WASHER FLUID
Check that there is sufficient fluid in the tank.
3. ENGINE COOLANT LEVEL
Check that the coolant level is between the ºFULLº and ºLOWº lines on the see±through reservoir.
4. RADIATOR AND HOSES
(a) Check that the front of the radiator is clean and not blocked with leaves, dirt or bugs.
(b) Check the hoses for cracks, kinks, rot or loose connections.
5. BRAKE FLUID LEVELS
Check that the brake fluid levels are near the upper level line on the see±through reservoirs.
6. CHECK TRANSAXLE OIL (FLUID)

Visually check the transaxle for oil (fluid) leakage.

If leakage is found, check for the cause and repair.
HINT:
Wait until the engine and motor cools down (approx. 30 min.) before checking the fluid level after extended
driving at high speeds, in hot weather, in heavy traffic or pulling a trailer.

EM1IU±03
A13907
A13908
A13934
A13943
± ENGINE MECHANICALTIMING CHAIN
EM±15
2001 PRIUS (RM778U)
REMOVAL
1. DISCONNECT BATTERY NEGATIVE (±) TERMINAL
AND HV BATTERY SERVICE PLUG
(See page HV±1)
2. REMOVE OUTER FR COWL TOP PANEL ASSEMBLY
(See page BO±32)
3. REMOVE RH ENGINE UNDER COVER
4. DRAIN ENGINE COOLANT
5. REMOVE AIR CLEANER ASSEMBLY
(a) Disconnect the MAF meter connector.
(b) Disconnect the EVAP hose from the air cleaner case.
(c) Loosen the 2 hose clamps.
(d) Remove the 3 bolts and air cleaner assembly.
6. REMOVE BRAKE RESERVOIR TANK
(a) Disconnect the brake fluid level sensor connector.
(b) Remove the 2 bolts and remove the reservoir tank and
suspend it.
(c) Remove the 3 bolts and reservoir tank bracket.
7. DISCONNECT CONNECTORS
(a) Disconnect the 4 ignition connectors.
(b) Disconnect the 4 injector connectors.
(c) Disconnect the 2 VSV connectors.
(d) Disconnect the camshaft position sensor connector.
(e) Disconnect the water temperature connector.
(f) Disconnect the Camshaft timing oil control valve connec-
tor.
8. REMOVE AIR INLET
9. REMOVE ENGINE COOLANT RESERVOIR TANK
10. REMOVE VSV FROM ENGINE MOUNTING INSULA-
TOR
11. REMOVE DRIVE BELT

A13939
I18009
A13909
A13938
EM±60
± ENGINE MECHANICALENGINE UNIT
2001 PRIUS (RM778U)
12. INSTALL EXHAUST PIPE
(a) Install the 2 gaskets to the exhaust pipe and connect the
2 O±rings.
(b) Install the 2 springs and 3 bolts.
Torque:
Front exhaust pipe: 62 N´m (630 kgf´cm, 46 ft´lbf)
Tailpipe: 32 N´m (326 kgf´cm, 24 ft´lbf)
(c) Connect the hose to the actuator.
(d) Connect the heated oxygen sensor.
13. INSTALL A/C COMPRESSER
(a) Connect the A/C compresser to the engine with the 4
bolts.
Torque: 25 N´m (255 kgf´cm, 18 ft´lbf)
(b) Connect the A/C compresser connector.
14. CONNECT INTERMEDIATE EXTENSION STEERING
ASSEMBLY (See page SR±14)
15. INSTALL DRIVE BELT (See page SA±23)
16. CONNECT FUEL TUBE
17. INSTALL J/B NO. 1 TO RH FENDER APRON
18. CONNECT ENGINE WIRE TO CABIN
(a) Pull in the engine wire to the cowk panel and connect the
grommet.
(b) Connect the ECM connectors.
(c) Install the ECM (See page SF±63).
19. INSTALL BRAKE RESERVOIR TANK
(a) Install the reservoir tank with the 2 bolts.
(b) Connect the brake fluid level sensor connector.
20. CONNECT SHIFT LEVER CABLE TO TRANSAXLE
21. CONNECT HEATER HOSE TO CYLINDER BLOCK
22. CONNECT 2 RADIATOR HOSES TO RADIATOR
23. INSTALL ENGINE COOLANT RESERVOIR TANK
24. INSTALL AIR INLET