oil TOYOTA PRIUS 2001 Service Repair Manual

2001 PRIUS (EWD414U)
B
[A]: Part Code
[B]: Part Name
[C]: Part Number
Toyota Part Number are indicated.
Not all of the above part numbers of the connector are established for the supply. In case of ordering a connector
or terminal with wire, please confirm in advance if there is supply for it using
ªParts Catalog Newsº (published by
Parts Engineering Administration Dept.).
A 5
90980±11194
L PART NUMBER OF CONNECTORS
Code Part Name Part NumberCode Part NamePart Number
A 1
A 2
A 4
A 6
A 7A/C Ambient Temp. Sensor
A/C Condenser Fan Motor
A/C Triple Pressure SW (A/C Dual and
Single Pressure SW)
A/T Oil Temp. Sensor
ABS Actuator
ABS Actuator90980±11070
90980±11237
90980±10943
90980±11413
90980±11151D 4
D 5
D 6
D 7
D 8
D 9
D10
D11Diode (Door Courtesy Light)
Diode (Key Off Operation)
Diode (Luggage Compartment Light)
Door Lock Control Relay
Door Courtesy Light LH
Door Courtesy Light RH
Door Courtesy SW LH
Door Courtesy SW RH90980±11608
90980±10962
90980±11608
90980±10848
90980±11148
90980±11097
A 8ABS Speed Sensor Front LH
90980±10941
A 9ABS Speed Sensor Front RH
90980±11856 A10Airbag Sensor Front LH
A11Airbag Sensor Front RHD12Door Courtesy SW Front LH
90980±11156 D13Door Courtesy SW Front RH
D14Door Courtesy SW Rear LH
Door Courtesy SW Rear RH
D15
[B] [C]
A12
Auto Antenna Motor90980±11194 A 3
A/C Condenser Fan Relay90980±10940
[A]
90980±11009
90980±11002
D16
D17Door Key Lock and Unlock SW LH
Door Key Lock and Unlock SW RH90980±11170

2001 PRIUS (EWD414U)
E GLOSSARY OF TERMS AND SYMBOLS
BATTERY
Stores chemical energy and
converts it into electrical energy.
Provides DC current for the auto's
various electrical circuits.GROUND
The point at which wiring attaches to
the Body, thereby providing a return
path for an electrical circuit; without a
ground, current cannot flow.
CAPACITOR (Condenser)
A small holding unit for temporary
storage of electrical voltage.HEADLIGHTS
Current flow causes a headlight
filament to heat up and emit light. A
headlight may have either a single
(1) filament or a double (2) filament
1. SINGLE
FILAMENT
CIGARETTE LIGHTER
An electric resistance heating
element.2. DOUBLE
FILAMENT
CIRCUIT BREAKER
Basically a reusable fuse, a circuit
breaker will heat and open if too
much current flows through it.
Some units automatically reset when
cool, others must be manually reset.HORN
An electric device which sounds a
loud audible signal.
DIODE
A semiconductor which allows
current flow in only one direction.IGNITION COIL
Converts low±voltage DC current
into high±voltage ignition current for
firing the spark plugs.
DIODE, ZENERA diode which allows current flow in one
direction but blocks reverse flow only up
to a specific voltage. Above that potential,
it passes the excess voltage. This acts as
a simple voltage regulator.LIGHT
Current flow through a filament
causes the filament to heat up and
emit light.
PHOTODIODE
The photodiode is a semiconductor
which controls the current flow
according to the amount of light.LED (LIGHT EMITTING DIODE)
Upon current flow, these diodes emit
light without producing the heat of a
comparable light.
DISTRIBUTOR, IIA
Channels high±voltage current from
the ignition coil to the individual
spark plugs.METER, ANALOG
Current flow activates a magnetic
coil which causes a needle to move,
thereby providing a relative display
against a background calibration.
FUSEA thin metal strip which burns through
when too much current flows through it,
thereby stopping current flow and
protecting a circuit from damage.
FUSIBLE LINK
METER, DIGITAL
Current flow activates one or many
LED's, LCD's, or fluorescent
displays, which provide a relative or
digital display.
FUEL
FUSIBLE LINK
A heavy±gauge wire placed in high
amperage circuits which burns through on
overloads, thereby protecting the circuit.
The numbers indicate the crosssection
surface area of the wires.(for Medium Current Fuse)
(for High Current Fuse or
Fusible Link)MOTOR
A power unit which converts
electrical energy into mechanical
energy, especially rotary motion.
M

2001 PRIUS (EWD414U)
E
RELAY
Basically, an electrically operated
switch which may be normally
closed (1) or open (2).
Current flow through a small coil
creates a magnetic field which either
opens or closes an attached switch.
1. NORMALLY
CLOSED
2. NORMALLY
OPEN
SWITCH, MANUAL
Opens and closes
iitth b
SPEAKER
An electromechanical device which
creates sound waves from current
flow.
RELAY, DOUBLE THROW
A relay which passes current
through one set of contacts or the
other.
circuits, thereby
stopping (1) or
allowing (2) current
flow.1. NORMALLY
OPEN
2. NORMALLY
CLOSED
RESISTOR
An electrical component with a fixed
resistance, placed in a circuit to
reduce voltage to a specific value.SWITCH, DOUBLE THROW
A switch which continuously passes
current through one set of contacts
or the other.
RESISTOR, TAPPED
A resistor which supplies two or
more different non adjustable
resistance values.SWITCH, IGNITION
A key operated switch with several
positions which allows various
circuits, particularly the primary
ignition circuit, to become
operational.
RESISTOR, VARIABLE or RHEOSTAT
A controllable resistor with a variable
rate of resistance.
Also called a potentiometer or
rheostat.
SENSOR (Thermistor)
A resistor which varies its resistance
with temperature.SWITCH, WIPER PARK
Automatically returns wipers to the
stop position when the wiper switch
is turned off.
(Reed Switch Type)
SENSOR, SPEED
Uses magnetic impulses to open
and close a switch to create a signal
for activation of other components.TRANSISTOR
A solidstate device typically used as
an electronic relay; stops or passes
current depending on the voltage
applied at ºbaseº.
SHORT PIN
Used to provide an unbroken
connection within a junction block.WIRES
Wires are always drawn as
straight lines on wiring
diagrams.
Crossed wires (1) without a
black dot at the junction are
tj i d
(1) NOT
CONNECTED
SOLENOID
An electromagnetic coil which forms
a magnetic field when current flows,
to move a plunger, etc.
j
not joined;
crossed wires (2) with a
black dot or octagonal ( )
mark at the junction are
spliced (joined)
connections.
(2) SPLICED

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

2001 PRIUS (EWD414U)
G
Position of Parts in Engine Compartment
I 1 Ignition Coil and Igniter No.1
I 2 Ignition Coil and Igniter No.2
I 3 Ignition Coil and Igniter No.3
I 4 Ignition Coil and Igniter No.4
I 5 Injector No.1
I 6 Injector No.2
I 7 Injector No.3
I 8 Injector No.4
I 9 Inverter
I 10 Inverter
I 11 Inverter
I 12 Inverter
I 13 Inverter
I 14 Inverter
K 1 Knock Sensor
M 1 Mass Air Flow Meter
M 2 Motor Generator No.1
M 3 Motor Generator No.2
M 4 Motor Generator No.2N 1 Noise Filter (Ignition)
O 1 Oil Pressure SW
R 1 Radiator Fan Motor
S 1 Steering Shaft Torque Sensor
T 1 Theft Deterrent Horn
T 2 Throttle Control Motor
T 3 Throttle Position Sensor
V 1 Vacuum Sensor (HC Adsorber and Catalyst System)
V 2 VSV (EVAP)
V 3 VSV (HC Adsorber and Catalyst System)
W 1 Washer Motor
W 2 Water Pump Motor (A/C)
W 3 Water Pump Motor (Inverter)
W 4 Water Temp. SW

2001 PRIUS (EWD414U)
E 4E 4E 4E 4
E 3E 3E 3
I 7 I 7 I 7
A 14 A 13 A 12 A 25 A 11E 4
2 1
B 5 A C
B B
D 9
B 3B9C25 B4A29
2 1
I 7 I 7B 22 B10 B19
I 71 2
I 7B 14 14 14 14 14
432
15 32 32 32 32
IGNITION COIL AND
IGNITER NO. 1 I 1
IGNITION COIL AND
IGNITER NO. 2 I 2
IGNITION COIL AND
IGNITER NO. 3 I 3
IGNITION COIL AND
IGNITER NO. 4 I 4
INJECTOR NO. 1 I 5 ENGINE COOLANT TEMP. SENSOR E 1 VSV (
EVAP) V 2
MASS AIR FLOW METER M 1JUNCTION
CONNECTORB J24 A , J25
B±R
W
B±R
G
B±R
Y
B±R
Y Y±G B±W
B±W
W± B
B±W
W± B
B±W
W± B
B±W
W± B
B±W (
*1) R±B
G
R
(
*1)
W R±LB G±R
G±RR±WB±W
B±WB
B±W B±W B±W B±W B±WB
B±W
B B G±R G±R
BR BR
B
B
(
*1) B B
B B
B
BR BRB±R
B±R B±R B±RW±B W± B W±B W± B W± B
THW EVG VG THA EVP1 +B MREL FC BATT IGSW IGT1 IGF IGT2 IGT3 IGT4 # 10
1B 12
O 1
OIL PRESSURE SWY±B
MOPS E10 , D C , E 9 AE 8, E 7 B
ENGINE CONTROL MODULE
* 1 : SHIELDEDB

2001 PRIUS (EWD414U)
IO1 6
I 7C 20 B 18
I 7IK1 7IK16 IE1 1IE12 D 1D12
IK1 1IE1 22D 7 D 11
I 6
A DD 16
B EBEBE A 41 2
A 23 A24 C10 C18 C19 C28 C27
1
422
IE1 12 2
431
L P Y BRO Y±R
W± GLG
W± G B±W B±W
P±L
W
BRBR BR
B
BR
BR
Y
G± YBR(
*1)
BR BR
B
BB
B(
*1)
(
*1)
P±L
W P±L
W
(
*1)
(
*1)
(
*1)CAMS HAFT TIMING OIL
CONTROL VALVE C 2 VSV (
HC ADSORBER AND
CATALYST SYSTEM) V 3
HEATED OXYGEN SENSOR
(
BANK 1 SENSOR 1) H 3
HEATED OXYGEN SENSOR
(
BANK 1 SENSOR 2) H 9 BJUNCTION
CONNECTORB J22 A , J23
HT1B OX1 B E11 OX1A HT1A HCC E2SPHV
13HTE± HTE+ ETH+ ETH± OCV± OC V+ FAN
FROM FAN NO. 1 AND
FAN NO. 2 RE LAY
(
*1)
(
*1)(
*1)
(
*1) * 1 : SHIELDED
E10 , D C , E 9 AE 8, E 7 B
ENGINE CONTROL MODULE
I 6
(
*1)
BR D 5
V±W
SPD
TO COMBI NATION
METER
SPDO HTE± HTE+ ETH+ ETH1
D 6D29 D19 D28 D27
C 21
G
GO GO
B 10
C 16
R±Y
ESTP ESTP
D 8D 1 HYBRID VEHICLE CONTROL ECUD H12 , H14
B15A
STOP FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2K 9
1 2 DBEA
STOP LIGHT SW S 3JUNCTION
CONNECTORB J14 A , J15 G± W
G± W R± B
STPG±W
IA2 9
G

2001 PRIUS (EWD414U)
ENGINE CONTROL
This system utilizes an engine control module and maintains overall control of the engine, transmission and so on. An outline
of the engine control is explained here.
1. INPUT SIGNALS
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built±in thermistor with a resistance which
varies according to the engine coolant temp. thus the engine coolant temp. is input in the form of a control signal into
TERMINAL THW of the engine control module.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal into TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust gases is detected and input as a control signal into TERMINALS OX1A and OX1B of
the engine control module.
(4) RPM signal circuit
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor.
Camshaft position is input as a control signal to TERMINAL G2 of the engine control module, and engine RPM is input
into TERMINAL NE+.
(5) Throttle signal circuit
The throttle position sensor detects the throttle valve opening angle, which is input as a control signal into TERMINALS
VTA and VTA2 of the engine control module.
(6) Vehicle speed signal circuit
The vehicle speed signal from brake ECU, detects the vehicle speed and inputs a control signal into TERMINAL SPD of
the engine control module via the combination meter.
(7) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, the
voltage for engine control module start±up power supply is applied to TERMINAL +B of the engine control module via
EFI relay.
(8) Engine knock signal circuit
Engine knocking is detected by knock sensor and the signal is input into TERMINAL KNK1 of the engine control module
as a control signal.
2. CONTROL SYSTEM
*SFI system
The SFI system monitors the engine condition through the signals, which are input from each sensor to the engine
control module. The best fuel injection volume is decided based on this data and the program memorized by the engine
control module, and the control signal is output to TERMINALS #10, #20, #30 and #40 of the engine control module to
operate the injector. (Inject the fuel). The SFI system produces control of fuel injection operation by the engine control
module in response to the driving conditions.
*ESA system
The ESA system monitors the engine condition through the signals, which are input to the engine control module from
each sensor. The best ignition timing is detected according to this data and the memorized data in the engine control
module, and the control signal is output to TERMINALS IGT1, IGT2, IGT3 and IGT4. This signal controls the ignition coil
and igniter to provide the best ignition timing for the driving conditions.
*Fuel pump control system
The engine control module operation outputs to TERMINAL FC and controls the CIR OPN relay. Thus controls the fuel
pump drive speed in response to conditions.
3. DIAGNOSIS SYSTEM
With the diagnosis system, when there is a malfunctioning in the engine control module signal system, the malfunction
system is recorded in the memory. The malfunctioning system can then be found by reading the display (Code) of the
malfunction indicator lamp.
4. FAIL±SAFE SYSTEM
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control based
on the signals from that system, the fail±safe system either controls the system by using data (Standard values) recorded in
the engine control module memory or else stops the engine.
SYSTEM OUTLINE

2001 PRIUS (EWD414U)
With the ignition SW turned on, the current flows to TERMINAL 15 of the body ECU through GAUGE fuse.
Voltage is applied at all times to TERMINAL (A) 11 of the body ECU through the TAIL relay. Coil side, and to TERMINAL (A)
2 through the HEAD relay coil side (w/o daytime running light) or through the daytime running light relay (w/ daytime running
light).
1. NORMAL LIGHTING OPERATION

With the light control SW turned to TAIL position, a signal is input into TERMINAL (A) 18 of the body ECU. Due to this signal,
the current flowing to TERMINAL (A) 11 of the body ECU flows to TERMINAL (A) 18 to TERMINAL 14 of the light control SW
to TERMINAL 16 to GROUND, and taillight relay causes taillights to turn on.

With the light control SW turned to HEAD position, a signal is input into TERMINALS (A) 17 and (A) 18 of the body ECU. Due
to this signal, the current flowing to TERMINAL (A) 2 of the body ECU flows to TERMINAL (A) 17 to TERMINAL 13 of the
light control SW to TERMINAL 16 to GROUND in the headlight circuit, and causes taillight and HEAD relay to turn the lights
on. The taillight circuit is same as above.
2. LIGHT AUTO TURN OFF OPERATION
With light on and ignition SW turned off (Input signal goes to TERMINAL 15 of the body ECU), when the driver's door is
opened (Input signal goes to TERMINAL 3 of the body ECU), the ECU operates and the current is cut off which flows from
TERMINAL (A) 11 of the body ECU to TERMINAL (A) 18 in taillight circuit and from TERMINAL (A) 2 to TERMINAL (A) 17 in
headlight circuit.
As a result, all lights are turned off automatically.
HEAD RELAY
2±1 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
Closed with the engine running and the parking brake lever released (Parking brake SW off) [w/ daytime running light]
TAIL RELAY
3±5 : Closed with the light control SW at TAIL or HEAD position
D6 DOOR COURTESY SW LH
1±GROUND : Continuity with the front LH door open
B8 (A), B9 (B) BODY ECU
15±GROUND : Approx. 12 volts with the ignition SW at ON position
3±GROUND : Continuity with the front LH door open
(B) 9±GROUND : Always approx. 12 volts
(A) 1±GROUND : Always continuity
(A) 2±GROUND : Continuity with the light control SW at HEAD position
(A)11±GROUND : Continuity with the light control SW at TAIL or HEAD position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B9B36F13D34J2037
C1336F1838J24A37
D336J1137J25B37
D638J12A37J2737
F11B34J13B37U137
F12C34J1737
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)1F27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2C30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)2D30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2H31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2K31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
SYSTEM OUTLINE
SERVICE HINTS

2001 PRIUS (EWD414U)
BUZZERB 3A132B 7
2A 6A GAG B GBG
114
4 11
GR± LV±W V±W V±W
GR±L GR ±B GR
LV±W
MPX+ MPD1 MPD2
MP2+
C11 , A C10 B
COMBINATION METERA/C AMPLIFIER A 7
GATEWAY ECU G 1
JUNCTION
CONNECTORB J27 , J28AFROM HYBRID VEHICLE
CONTROL ECU
FROM ENGINE CONTROL MODULE
FROM NAVIGATION ECU
CHARGEOIL SEAT BELT
(
FRONT
PASSENGER' S SEAT) SEAT BELT
(
DRIVER' S SEAT) BRAKEHEAD DOOR
GA
FROM MULTI DISPLAY
V±W