display TOYOTA PRIUS 2001 Service Repair Manual

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)
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)
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)
ILLUMINATION
1 2
LG LG W±L
W±LASHTRAY ILLUMINATION A22
CIGARETTE LIGHTER ILLUMINATION C 9
1 2
6 8MULTI DISPLAY M 7LG
IF
BR BR
1
120A MAIN 100A DC/DC
2H 1
16 2K 6
1823 15
ID2 2
ID2 6
14
IG 11
A T
LG LG LG±R LG±R
W± BB±G W
TRLYTAI L
RELAY
1DBODY
ECU B 9
1B
FUSIBLE LINK
BLOCK NO. 1D F11 B , F13
F18
FUSIBLE LINK
BLOCK NO. 2
LIGHT CONTROL SW
[COMB. SW] C13
BATTERYOFF
TAIL
HEAD
JUNCTION
CONNECTOR J1 75A
PANEL
2D 1
LG LG LG LG
W± L
W± L

2001 PRIUS (EWD414U)
C 10 C9
B 7 C 8
IF
R
G
G
R
BR BRGR
BR BR
TX± TX+ GND
310 874
CF CF
F
C MULTI
DISPLAY M 5
CENTER CLUSTER SW C 7
JUNCTION
CONNECTOR J26
IJ1 21 BR
BR BR
* 1 : W/ NAVIGATION SYSTEM
* 2 : W/O NAVIGATION SYSTEM
RADIO AND PLAYERB R 2 , R 3AC, R 4 G
R
12 C
GR GR
ACC
1
11 C
P±B P±B
EJCT
9
5C
L±R L±R
+B
2
GND TX+ TX± GND ACC+B EJECT BU+B TX+ TX±

2001 PRIUS (EWD414U)
NAVIGATION SYSTEM
15A
DOMEFROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1J 710A
ACC
2D 2
A 18 A 910 B B 5
L±Y
GR ±R
R
G GR±R L±Y
+B ACCTX1+ TX1 ± 2G 2
2D 4
L±Y
B CA CJUNCTION
CONNECTORB J27 A , J28
L±Y
L±Y GR±R
GR±R
NAVIGATION ECUB N 2 , N 3AB C A BAB
JUNCTION
CONNECTORB J24 A , J25
AM 6, M 5 B
MULTI DISPLAYC , M 7
C 1 C 4B5B10
B C
IJ1 4 IJ1 1
GR±R GR±RL±Y
B
BJUNCTION
CONNECTOR J26IJ1 6IJ17IJ1226B
IJ1 16
2B
R B 2
W R
G
W(
SHIELDED)
(
SHIELDED) (
SHIELDED)
(
SHIELDED)
5A
ECU±IG
2I 2
ID1 5C 2
P±B
14 A
P±B
D
D
E D
D
E
JUNCTION
CONNECTOR J14
JUNCTION
CONNECTOR J21
JUNCTION
CONNECTOR J26B±Y B±Y
B±Y
B±Y11 A A4 12 5
G
R
GATEWAY ECU G 1
A 13
ID1 7
B E
A E
1
R±Y R±Y R±Y
PARKING
BRAKE SW P 2
JUNCTION
CONNECTORB J12 A , J13
I 5
BR
13
TC
DATA LINK
CONNECTOR 3 D 2 IG ACC +B1 PKB TC TX1+ TX1± VG RTX3 ± TX3+ GTX± GTX+

2001 PRIUS (EWD414U)
A 17
IF
R
G
G
R GR BR
87
CF CF
F
CCENTER
CLUSTER SW C 7
GNDJUNCTION
CONNECTOR J26 M 7 , C
MULTI DISPLAYB M 5 , M 6A
AN 3, N 2 B
NAVIGATION ECU IJ1 17 IJ118 IJ119 IJ120
B 7
G3B B1
BVRB 6
VG B 7
R
B 3
G
B 1
Y
A 5
IJ1 3
A 52B 7
2A 6
A 13 B110A
GAUGE FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2C 3
25 13
IJ1 5A 14REV
R
G
Y
V±W V±W
V±W V±W
L
W± G
R±L R±B
R±B
R±BBR BR
COMBINATION METERB C10 , C11A 10 9
BACK±UP
LIGHT
RELAY B 5
RADIO AND
PLAYER R 4C 6
A 3A10
(
SHIELDED) (
SHIELDED)
SPDR±L
IJ1 21
BR
15 IJ1
8B
SYNCB 8
B B
A 14
IH 2A7
2B6
L
BR TX± TX+
GND1
G SYNC B VR SPD TX+ TX±
TX+ TX± A G
A GAG J27
JUNCTION
CONNECTORA
A DA D
J27
JUNCTION
CONNECTORA

2001 PRIUS (EWD414U)
NAVIGATION SYSTEM
N2 (A) NAVIGATION ECU
(A) 9±GROUND : Always approx. 12 volts
(A)18±GROUND : Approx. 12 volts with the ignition SW at ON or ACC position
(A)17±GROUND : Always continuity
M7 (C) MULTI DISPLAY
(C)2±GROUND : Approx. 12 volts with the ignition SW at ON position
(C)4±GROUND : Approx. 12 volts with the ignition SW at ON or ACC position
(C)6±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B536J1437M6B37
C736J2137M7C37
C10A36J24A37N2A39
C11B36J25B37N3B39
D236J2637P237
G137J27A37R437
J12A37J28B37
J13B37M5A37
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2A
2B30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)2C30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2I31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
ID142Instrument Panel Wire and Cowl Wire (Left Kick Panel)
IJ144Floor No.3 Wire and Instrument Panel Wire (Under the Instrument Panel Center)
: GROUND POINTS
CodeSee PageGround Points Location
IF42Left Kick Panel
IH42Right Kick Panel
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I544Instrument Panel Wire
SERVICE HINTS

2001 PRIUS (EWD414U)
GATEWAY SYSTEM
10A
ACC
2D 27. 5A
ECU±B FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2C 55A
ECU±IG
2I 2
A CAF
B CBH
ID1 5
B D
A E
ID 2D 8
2K 8 12 5 14 7
E
A4 3 15 13
D D
11 4
A E
112 16 14
D D
11 2 8 9
4
A
AGR±B W± BGR±L
MPX2
MPX+
MPX±
MP2+ MPD1 CG GN D GTX+ GTX±
GR GR±B GRGR±L W±B
GR± B W±B W±B W±B W±BW±BR GGR±R
R±G R±GGR± R
B±Y B±Y B±Y B±Y
JUNCTION
CONNECTORB J27 , J28
AJUNCTION
CONNECTOR J14
JUNCTION
CONNECTOR J21
GATEWAY ECU G 1ENGINE
CONTROL
MODULE E10
BODY
ECU B 8
COMBINATION
METER C11 ACC BATT IG MPD2MPX1
MPX±
MPX+
MPX+
A/C
AMPLIFIER A 7 JUNCTION
CONNECTOR J21
JUNCTION
CONNECTOR J24
JUNCTION
CONNECTOR J11 MULTI DISPLAY M 5JUNCTION
CONNECTORB J22 , J23
A TX3± TX3 +

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