2000 TOYOTA CAMRY Service Repair Manual

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Page 521 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 42ENGINEÐ5S±FE ENGINE
5. Main Components of Engine Control System
The following table compares the main components of the new 5S±FE engine, and previous 5S±FE engine.
Model
NewPreviousComponentNew

Page 522 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 43 ENGINEÐ5S±FE ENGINE
Air Fuel Ratio Sensor (California Specifications Models Only)
As illustrated below, the conventional oxygen sensor is characterized by a sudden change in its output voltage at

Page 523 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 44ENGINEÐ1MZ±FE ENGINE
1MZ±FE ENGINE
DESCRIPTION
The 1MZ±FE engine has achieved a reduction in exhaust emissions through the adoption of the fuel returnless system
and the changes made onto the

Page 524 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 45 ENGINEÐ1MZ±FE ENGINE
Premium unleaded gasoline (96RON) is used for the above performance curve.

Page 525 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 46ENGINEÐ1MZ±FE ENGINE
MAJOR DIFFERNCES
Major differences between the new 1MZ±FE engne and previous engine are listed below.
Item
Outline
Cooling SystemAn aluminum radiator core is used for weigh

Page 526 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 47 ENGINEÐ1MZ±FE ENGINE
FUEL SYSTEM
1. Fuel Returnless System
The new Camry has adopted a fuel returnless system to reduce evaporative emissions. With the pressure regulator
housed inside the fuel

Page 527 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 48ENGINEÐ1MZ±FE ENGINE
ENGINE CONTROL SYSTEM
1. General
The engine control system of the new 1MZ±FE engine is basically the same in construction and operation as that of
the previous 1MZ±FE engi

48ENGINEÐ1MZ±FE ENGINE
ENGINE CONTROL SYSTEM
1. General
The engine control system of the new 1MZ±FE engine is basically the same in construction and operation as that of
the previous 1MZ±FE engine. However, the fuel pressure control has been discontinued and the EGR control system
has been changed.
The engine control system of the new 1MZ±FE engine and previous 1MZ±FE engine are compared below.
System
OutlineNewPrevious
SFI
(SequentialA L±type SFI system directly detects intake air mass with
a hot wire type mass air flow meter.(q
Multiport Fuel
Injection)The fuel injection system is a sequential multiport fuel
injection system.
ESA
Ignition Timing is determined by the ECM based on
signals from various sensors. The ECM corrects ignition
timing in response to engine knocking.

(Electronic Spark2 knock sensors are used to improve knock detection.(p
Advance)In vehicles equipped with automatic transaxle, torque
control correction during gear shifting has been used to
minimize the shift shock.

IACA rotary solenoid type IAC valve controls the fast idle(Idle Air Control)
A rotary solenoid type IAC valve controls the fast idle
and idle speeds.
ACIS
(Acoustic Control
The intake air passages are switched according to the en-
gine speed and throttle valve angle to increase perfor(Acoustic Control
Induction System)
gine speed and throttle valve angle to increase perfor-
mance in all speed ranges.
Fuel Pressure
ControlIn hot engine conditions, the fuel pressure is increased to
improve restartability.
Oxygen Sensor
Heater ControlMaintains the temperature of the oxygen sensor at an
approppiate level to increase accuracy of detection of
the oxygen concentration in the exhaust gas.

EGR Cut±Off
ControlCuts off EGR according to the engine condition to
maintain drivability of the vehicle and durability of
EGR components.
Ð
EGR Control
Uses the duty control type VSV and EGR valve position
sensor, controlling the EGR volumne in accordance with
engine conditions.
Ð
Evaporative
Emission ControlThe ECM controls the purge flow of evaporative emis-
sions (HC) in the charcoal canister in accordance with
engine conditions.

Diagnosis
When the ECM detects a malfunction, the ECM diagnoses
and memorizes the failed section.
DiagnosisThe diagnosis system includes a function that detects a
malfunction in the evaporative control system.Ð
Fail SafeWhen the ECM detects a malfunction, the ECM stops
or controls the engine according to the data already stored
in memory

Page 528 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 49 ENGINEÐ1MZ±FE ENGINE
2. Construction
The configuration of the engine control system in the new 1MZ±FE engine is as shown in the following chart. Shaded
portions
differ from the previous 1MZ±FE

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