O2 sensor TOYOTA PRIUS 2001 Service Repair Manual

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W±R
7. 5A
GAUGE
1 2
34
4 8 7
2111134
1 2
3 4
1 2
B18
BL FROM POWER SOURCE SYSTEM (SEE PAGE 66)
R±L
R±L G
W±B W±B
W±B
W±BW±B
W±B
Y±GR
L 4
H17
R 6
DELAY
CIRCUIT S 6
B18
3 4
R 7
BV11
G±W G±R
G±R
G±R
G±R
G±W
G±W
(W/G)
(S/D) (S/D)
C 7
(SHIELDED) BV11I 5
L L
STOP LIGHT
15
7
TO ABS ECU
BO
50
15A
STOP
IBIB
REAR LIGHTS
WARNING LIGHT
[COMB. METER] 3C 3C
IE1 14 STOP LIGHT SW
STOP LIGHT RH
[REAR COMB. LIGHT RH]
STOP LIGHT RH
[REAR COMB. LIGHT LH]
HIGH MOUNTED
STOP LIGHT
[A]
[B]
[I]
[D]
[F]
[H]
[E]
[J]
[M]
[N][K]
[L]
[G]
[C]
LIGHT FAILURE SENSOR
2001 PRIUS (EWD414U)
B HOW TO USE THIS MANUAL
*The system shown here is an EXAMPLE ONLY. It is different to the actual
circuit shown in the SYSTEM CIRCUITS SECTION.

[O]
[P]
[Q]
[R]
[S]
[T]
[U]
[V]
2001 PRIUS (EWD414U)
B HOW TO USE THIS MANUAL
Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW.
When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flows
through the rear lights warning light to TERMINAL 4 of the light failure sensor.
STOP LIGHT DISCONNECTION WARNING
When the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the current
flowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects the
disconnection and the warning circuit of the light failure sensor is activated.
As a result, the current flows from TERMINAL 4 of the light failure sensor to TERMINAL 11 to GROUND and turns the rear lights
warning light on. By pressing the brake pedal, the current flowing to TERMINAL 8 of the light failure sensor keeps the warning
circuit on and holds the warning light on until the ignition SW is turned off.
S6 STOP LIGHT SW
2±1 : Closed with the brake pedal depressed
L4 LIGHT FAILURE SENSOR
1, 2, 7±GROUND : Approx. 12 volts with the stop light SW on
4, 8±GROUND : Approx. 12 volts with the ignition SW at ON position
11±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
C734L436R737
H1736R637S635
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
118R/B No.1 (Instrument Panel Left)

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: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
IB20Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
3C22Instrument Panel Wire and J/B No.3 (Instrument Panel Left Side)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IE142Floor Wire and Instrument Panel Wire (Left Kick Panel)
BV150Luggage Room Wire and Floor Wire (Luggage Compartment Left)
: GROUND POINTS
CodeSee PageGround Points Location
BL50Under the Left Quarter Pillar
BO50Back Panel Center
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I544Cowl WireB1850Luggage Room Wire
SYSTEM OUTLINE
SERVICE HINTS

2001 PRIUS (EWD414U)
B
[O]: Explains the system outline.
[P]: Indicates values or explains the function for reference during troubleshooting.
[Q]: Indicates the reference page showing the position on the vehicle of the parts in the system circuit.
Example : Part ºL4º (Light Failure Sensor) is on page 36 of the manual.
*The letter in the code is from the first letter of the part, and the number indicates its order in parts
starting with that letter.
Example : L 4 Parts is 4th in order
Light Failure Sensor
[R]: Indicates the reference page showing the position on the vehicle of Relay Block Connectors in the system circuit.
Example : Connector º1º is described on page 18 of this manual and is installed on the left side of the instrument
panel.
[S]: Indicates the reference page showing the position on the vehicle of J/B and Wire Harness in the system circuit.
Example : Connector º3Cº connects the Instrument Panel Wire and J/B No.3. It is described on page 22 of this
manual, and is installed on the instrument panel left side.
[T]: Indicates the reference page describing the wiring harness and wiring harness connector (the female wiring
harness is shown first, followed by the male wiring harness).
Example : Connector ºIE1º connects the floor wire (female) and Instrument panel wire (male). It is described on
page 42 of this manual, and is installed on the left side kick panel.
[U]: Indicates the reference page showing the position of the ground points on the vehicle.
Example : Ground point ºBOº is described on page 50 of this manual and is installed on the back panel center.
[V]: Indicates the reference page showing the position of the splice points on the vehicle.
Example : Splice point ºI5º is on the Cowl Wire Harness and is described on page 44 of this 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
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)
G ELECTRICAL WIRING ROUTING
Position of Parts in Instrument Panel
A 7 A/C Amplifier
A 8 A/C Amplifier
A 9 A/C Amplifier
A 10 A/C Room Temp. Sensor
A 11 A/C Solar Sensor
A 12 A/C Thermistor
A 13 Accel Position Sensor
A 14 Air Inlet Control Servo Motor
A 15 Air Mix Control Servo Motor
A 16 Air Vent Mode Control Servo Motor
A 17 Airbag Sensor Assembly
A 18 Airbag Sensor Assembly
A 19 Airbag Sensor Assembly
A 20 Airbag Squib (Front Passenger Airbag Assembly)
A 21 Airbag Squib (Steering Wheel Pad)
A 22 Ashtray Illumination
B 5 Back±Up Light Relay
B 6 Blower Motor
B 7 Blower Motor Linear Controller
B 8 Body ECU
B 9 Body ECU
B 10 Brake ECU
B 11 Brake ECU
B 12 Brake ECU
B 13 Brake ECU
B 14 Brake Warning BuzzerC 7 Center Cluster SW
C 8 Cigarette Lighter
C 9 Cigarette Lighter Illumination
C 10 Combination Meter
C 11 Combination Meter
C 12 Combination SW
C 13 Combination SW
C 14 Combination SW
D 2 Data Link Connector 3
D 3 Daytime Running Light Relay
D 4 Diode (Door Courtesy)
D 5 Diode (Daytime Running Light)
E 3 EMPS ECU
E 4 EMPS ECU
E 5 EMPS ECU
E 6 EMPS ECU
E 7 Engine Control Module
E 8 Engine Control Module
E 9 Engine Control Module
E 10 Engine Control Module

2001 PRIUS (EWD414U)
G
Position of Parts in Instrument Panel
G 1 Gateway ECU
H 7 Hazard Warning SW
H 8 Hazard Warning SW
H 9 Heated Oxygen Sensor (Bank 1 Sensor 2)
H 10 Hybrid Vehicle Control ECU
H 11 Hybrid Vehicle Control ECU
H 12 Hybrid Vehicle Control ECU
H 13 Hybrid Vehicle Control ECU
H 14 Hybrid Vehicle Control ECU
I 15 Ignition SW
J 1 Junction Connector
J 2 Junction Connector
J 3 Junction Connector
J 4 Junction Connector
J 5 Junction Connector
J 6 Junction Connector
J 7 Junction Connector
J 8 Junction Connector
J 9 Junction Connector
J 10 Junction Connector
J 11 Junction Connector
J 12 Junction Connector
J 13 Junction Connector
J 14 Junction Connector
J 15 Junction Connector
J 16 Junction Connector
J 17 Junction Connector
J 18 Junction Connector
J 19 Junction Connector
J 20 Junction Connector
J 21 Junction ConnectorJ 22 Junction Connector
J 23 Junction Connector
J 24 Junction Connector
J 25 Junction Connector
J 26 Junction Connector
J 27 Junction Connector
J 28 Junction Connector
J 29 Junction Connector
L 1 Light Control Rheostat
M 5 Multi Display
M 6 Multi Display
M 7 Multi Display
P 1 Park/Neutral Position SW
P 2 Parking Brake SW
P 3 PTC Heater
P 4 PTC Heater
R 2 Radio and Player
R 3 Radio and Player
R 4 Radio and Player
R 5 Remote Control Mirror SW
S 2 Shift Lock ECU
S 3 Stop Light SW
T 4 Transponder Key Computer
T 5 Turn Signal Flasher Relay
U 1 Unlock Warning SW and Key Interlock Solenoid
W 5 Wireless Door Control Receiver

2001 PRIUS (EWD414U)
G ELECTRICAL WIRING ROUTING
Position of Parts in Body
A 23 ABS Speed Sensor Rear LH
A 24 ABS Speed Sensor Rear RH
B 15 Battery Blower Motor
B 16 Battery Blower Motor Controller
B 17 Battery ECU
B 18 Battery ECU
B 19 Battery Fan Relay
B 20 Buckle SW and Tension Reducer LH
B 21 Buckle SW RH and
Seat Belt Warning Occupant Detection Sensor
D 6 Door Courtesy SW Front LH
D 7 Door Courtesy SW Front RH
D 8 Door Courtesy SW Rear LH
D 9 Door Courtesy SW Rear RH
D 10 Door Lock Control SW Front RH
D 11 Door Lock Motor and Door Unlock Detection SW
Rear LH
D 12 Door Lock Motor and Door Unlock Detection SW
Rear RH
D 13 Door Lock Motor, Door Key Lock and Unlock SW and
Door Unlock Detection SW Front LH
D 14 Door Lock Motor, Door Key Lock and Unlock SW and
Door Unlock Detection SW Front RHF 14 Front Door Speaker LH
F 15 Front Door Speaker RH
F 16 Fuel Pump and Fuel Sender
F 17 Fusible Link Block No.2
F 18 Fusible Link Block No.2
H 15 High Mounted Stop Light
H 16 Hybrid Vehicle Battery
H 17 Hybrid Vehicle Battery
I 16 Interior Light
I 17 Interlock SW
J 30 Junction Connector
J 31 Junction Connector
J 32 Junction Connector
J 33 Junction Connector
L 2 License Plate Light LH
L 3 License Plate Light RH
L 4 Luggage Compartment Door Unlock SW
L 5 Luggage Compartment Light
L 6 Luggage Compartment Light SW