2001 TOYOTA PRIUS Service Repair Manual

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Page 65 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 2001 PRIUS (EWD414U)
MEMO

Page 66 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 2001 PRIUS (EWD414U)
ENGINE CONTROL
120A MAIN
1C 1
D 11B 215A
AM2 1J 92C 2
2G 176AM2 IG2
ST2
32 512B 5
2G 11
1J 3
1K 3
BL 1A 2
EA 15A
EFI
32 51
1F 11A10 1A31A4 13 25
1F 12 1F13
IA2 4IA114
7 3
IGA C
B

Page 67 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 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 CO

Page 68 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 2001 PRIUS (EWD414U)
ENGINE CONTROL
2 1
B 62 1
A 1A1
2
2 E 4E 4E 4
1
I 7 IO1 9C 14
B BB 2
A CACACB 23 B21
I 7 IO1 15
BC1 3BC17BC14 C 22
I 7 B ABA
A C
BC1 5
BC1 2
C 11BC1 1
BC1 6
C 13 A7A8A30 12
1 1
13

Page 69 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 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

Page 70 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 2001 PRIUS (EWD414U)
ENGINE CONTROL
2 1
2 1 I 7B 24 B16 A 10
EBA 21 A31
B A B A B AA A A A A AB 17
A AD 13 D 14 D 6 C 6C8 CE CE
CRANKSHAFT POSITION
SENSOR C 6 CAMSHAFT POSITION
SENSOR C 1
JUNCTION
CON

Page 71 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 2001 PRIUS (EWD414U)
IGB 3B2 B 4 7. 5A
OBDII
2D 9
EB IO1 14ID2 14 15
B
115 4ED
4 11 16ED
BB
A71316FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
JUNCTION
CONNECTOR J26 JUNCTION
CONNECTOR J26 BODY ECU B 8
A/C

Page 72 of 1943

TOYOTA PRIUS 2001 Service Repair Manual 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 her

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

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