Engine Control System General
System |
Outline |
Sequential Multiport Fuel Injection |
• An L-type SFI system directly detects the intake air volume with a hot-wire type mass air flow meter. • The fuel injection system is a sequential multiport fuel injection system. |
Electronic Spark Advance |
Ignition timing is determined by the ECM based on signals from various sensors. The ECM corrects ignition timing in response to engine knocking. |
ETCS-i Electronic Throttle Control System-intelligent (See page-43) |
Optimally controls the throttle valve opening in accordance with the amount of accelerator pedal effort and the condition of the engine and the vehicle. |
• A linkless-type is used, without an accelerator cable. • An accelerator pedal position sensor is provided on the accelerator pedal. • A non-contact type throttle position sensor and accelerator pedal position sensor are used. | |
VVT-i Variable Valve Timing-intelligent (See page EG-48) |
Controls the intake camshaft to an optimal valve timing in accordance with the engine condition. |
Air-fuel Ratio Sensor, Oxygen Sensor Heater Control |
Maintains the temperature of the air-fuel ratio sensor or oxygen sensor at an appropriate level to realize accuracy of detection of the oxygen concentration in the exhaust gas. |
Air Conditioning Cut-off Control |
By turning the air conditioning compressor ON or OFF in accordance with the engine condition, drivability is maintained. |
Cooling Fan Control (See page EG-52) |
Radiator cooling fan operation is controlled by signals from ECM based on the engine coolant temperature sensor signal and the condition of the air conditioning operation. |
Fuel Pump Control (See page EG-53) |
• Fuel pump operation is controlled by signal from the ECM. • The fuel pump is stopped when the SRS driver's and front passenger's airbags are deployed. |
Evapotative Emission Control (See page EG-54) |
The ECM controls the purge flow of evaporative emissions (HC) in the canister in accordance with engine conditions. |
Approximately five hours after the ignition switch has been turned OFF, the ECM operates the canister pump module to detect any evaporative emission leakage occurring in the EVAP (evaporative emission) control system through changes in the 0.02 in. leak pressure. | |
Charging Control (See page EG-65) |
The ECM regulates the charging voltage of the generator in accordance with the driving conditions and the charging state of the battery. |
System |
Immobilizer*2 |
Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid ignition key. |
Diagnosis (See page EG-67) |
When the ECM detects a malfunction, the ECM diagnoses and memorizes the failed section. | |
Fail-safe (See page EG-67) |
When the ECM detects a malfunction, the ECM stops or controls the engine according to the data already stored in memory. |
*2: Models with Engine Immobilizer System
*2: Models with Engine Immobilizer System
2. Construction
The configuration of the engine control system in the 2AZ-FE engine is shown in the following chart. SENSORS ACTUATORS
2. Construction
The configuration of the engine control system in the 2AZ-FE engine is shown in the following chart. SENSORS ACTUATORS

(Continued)
01meg04y

01meg05y
01meg05y
*: Models with Engine Immobilizer System
3. Engine Control System Diagram
Park/Neutral Position Switch
Accelerator Pedal Position Sensor
Ignition ^ Switch
Park/Neutral Position Switch
Accelerator Pedal Position Sensor
Ignition ^ Switch

Canister Pump Module
• Leak Detection Pump
• Canister Pressure Sensor
Heated Oxygen Sensor (Bank 1, Sensor 2)
Air-fuel Ratio Sensor (Bank l, Sensor l)
Canister Pump Module
• Leak Detection Pump
• Canister Pressure Sensor
Heated Oxygen Sensor (Bank 1, Sensor 2)
Air-fuel Ratio Sensor (Bank l, Sensor l)
01meg09y
4. Layout of Main Components
Accelerator Pedal Position Sensor
Mass Air Flow Meter (Built-in Intake Air Temperature Sensor)
VSV (for EVAP)
Battery Current Sensor
DLC3
Accelerator Pedal Position Sensor
Mass Air Flow Meter (Built-in Intake Air Temperature Sensor)
VSV (for EVAP)

Air Fuel Ratio Sensor (Bank 1, Sensor 1)
Heated Oxygen Sensor (Bank 1, Sensor 2)
Fuel Pump
Air Fuel Ratio Sensor (Bank 1, Sensor 1)
Heated Oxygen Sensor (Bank 1, Sensor 2)
Injector
Knock Sensor
Camshaft Timing Oil Control Valve
Crakshaft Position Sensor
Injector
Knock Sensor
Camshaft Timing Oil Control Valve
Crakshaft Position Sensor

Ignition Coil with Igniter
Throttle Position Sensor
Camshaft Position Sensor
Water Temperature Sensor
Fuel Pump
Canister Pump Module
• Leak Detection Pump
• Canister Pressure Sensor
Ignition Coil with Igniter
Throttle Position Sensor
Camshaft Position Sensor
Water Temperature Sensor
01meg31y
5. Main Components of Engine Control System General
Component |
Outline |
Quantity |
ECM |
32-bit CPU |
1 |
Mass Air Flow Meter |
Hot-wire Type |
1 |
Crankshaft Position Sensor (Rotor Teeth) |
Pick-up Coil Type (36-2) |
1 |
Camshaft Position Sensor (Rotor Teeth) |
Pick-up Coil Type (3) |
1 |
Throttle Position Sensor |
Non-contact Type |
1 |
Accelerator Pedal Position Sensor |
Non-contact Type |
1 |
Knock Sensor |
Built-in Piezoelectric Element Type (Flat Type) |
1 |
Air-fuel Ratio Sensor (Bank 1, Sensor 1) |
Type with Heater (Planar Type) |
1 |
Heated Oxygen Sensor (Bank 1, Sensor 2) |
Type with Heater (Cup Type) |
1 |
Injector |
12-hole Type |
4 |
The 32-bit CPU of the ECM is used to increase the speed for processing the signals.
Air-fuel Ratio Sensor and Heated Oxygen Sensor 1) General
• The air-fuel ratio sensor and heated oxygen sensor differ in output characteristics.
• Approximately 0.4V is constantly applied to the air-fuel ratio sensor, which outputs an amperage that varies in accordance with the oxygen concentration in the exhaust emission. The ECM converts the changes in the output amperage into voltage in order to linearly detect the present air-fuel ratio. The air-fuel ratio sensor data is read out by the hand-held tester.
• The output voltage of the heated oxygen sensor changes in accordance with the oxygen concentration in the exhaust emission. The ECM uses this output voltage to determine whether the present air-fuel ratio is richer or leaner than the stoichiometric air-fuel ratio.
Air-fuel
Ratio
Sensor
Air-fuel
Ratio
Sensor
- 00reg21y
Air-fuel Ratio Sensor Circuit
Heated Oxygen Sensor
: Air-fuel Ratio Sensor : Heated Oxygen Sensor
Air-fuel Ratio Sensor Data Displayed on Hand-held Tester

Heated Oxygen Sensor Output (V)

Do It Yourself Car Diagnosis
Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.
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