MFI Fuel Injection System Hyundai Sonata 4

General rules for working with the electronic control system
Attention: see the section " Rules for performing work in the engine compartment " chapters " Maintenance and general inspection and adjustment procedures "....

Diagnostics of the fuel injection system
General scheme of the fuel injection system (MFI) engine 2.4 l (EOBD type). 1 - front oxygen sensor, 2 - throttle position sensor, 3 - camshaft position sensor, 4 -...

Checking with an oscilloscope
Normal waveforms of the main sensors The following figures show the normal output waveforms of the main sensors. The data is given when the engine speed is rapidly...

Periodic maintenance
Checking the idle speed Note: before starting the adjustment, check the condition of the spark plugs, injectors and idle speed control servo and make sure that the...

Throttle Position Sensor Adjustment (2.0L / 2.4L Engines)
Note: Before beginning the throttle position sensor test, adjust the base idle speed. 1. Connect the tester to a standard diagnostic socket. 2. If a tester is not used...

Throttle Position Sensor Adjustment (2.7L Engine)
1. Turn the ignition key to position "OFF" (OFF). 2. Disconnect the throttle position sensor connector. 3. With wire connector "crocodile" connect an ohmmeter to the...

Checking the mass air flow sensor (engine 2.7 l)
General information The hot-wire mass air flow sensor consists of a temperature-sensitive film sensor, a housing and a measuring channel (hybrid sensor element). The...

Checking the intake air temperature sensor (2.7L engine)
General information The intake air temperature sensor is located on the intake manifold. The sensor is a resistor that changes the signal voltage depending on the...

Fuel injection (MFI) components
Location of fuel injection system components (MFI). 1 - coolant temperature sensor, 2 - intake manifold absolute pressure sensor (2.0L engines), 3 - mass air flow sensor...

Checking the Mass Air Flow Sensor and Intake Air Temperature Sensor (2.4L Engine)
General information Hot-wire anemometric air flow sensor consists of a temperature-sensitive film sensor, housing and measuring channel (hybrid sensor element). The...

Checking the absolute pressure sensor in the intake manifold (engine 2.0 l)
General information The intake manifold absolute pressure sensor is a variable resistance that is sensitive to changes in pressure. It detects the change in intake...

Checking the coolant temperature sensor
General information The coolant temperature sensor is installed in the channel of the cylinder head cooling jacket. It detects the temperature of the engine coolant and...

Throttle position sensor test
General information The throttle position sensor is a sliding contact potentiometer that moves according to the rotation of the throttle shaft, indicating the opening...

Checking the camshaft position sensor
General information The principle of operation of the camshaft position sensor is based on the Hall effect. The sensor determines the moment of arrival of the pistons of...

Checking the crankshaft position sensor
General information The principle of operation of the crankshaft position sensor is based on the Hall effect. The sensor determines the position of the crankshaft cranks...

Oxygen Sensor Check (2.0L / 2.4L Engines)
General information The oxygen sensor determines the concentration of oxygen in the exhaust gases and accordingly changes the voltage of the signal that enters the...

Checking the oxygen sensor with heater (engine 2.7 l)
General information On models with a 2.7 liter engine, a titanium oxygen sensor is installed (TiO2). The oxygen sensor determines the concentration of oxygen in the...

Checking the injectors
General information The injectors inject fuel into the engine cylinders according to a signal from the electronic engine control unit. The amount of fuel supplied by the...

Checking the idle speed control servo
General information The idle speed control servo is an electric motor with two windings, which are switched on by separate control circuits of the electronic engine...

Checking the knock sensor
General information The knock sensor is a piezoelectric crystal. The knock sensor is installed on the wall of the cylinder block to determine the detonation combustion...

Checking the sensor-switch for fluid pressure in the power steering hydraulic system
The power steering hydraulic fluid pressure switch is sensitive to the presence of steering load and converts this data into a signal voltage. Based on this signal, the...

Checking the canister purge solenoid valve
General information The canister purge solenoid valve operates in PWM airflow control mode to purge the canister of the EVAP system. Engines 2.0 l / 2.4 l. Engine 2.7 l....

Checking ignition coils
General information When the power transistor switches to position "ON" (ON) at the signal of the electronic engine control unit, then current will be applied to the...

Fuel manifold — removal and installation
fuel manifold (engine 2.4 l). 1 - intake manifold, 2 - throttle body, 3 - idle speed control servo, 4 - power transistor, 5 - gasket, 6 - fuel manifold, 7 - fuel...

Fuel tank — removal, inspection, installation
Fuel tank. 1 - fuel filler cap, 2 - seal, 3 - fuel filler and drain hose assembly, 4 - fuel tank, 5 - fuel pump and fuel level sensor assembly, 6 - fuel level sensor, 7...

Fuel lines and lines of the evaporative emission system — removal and installation
Attention: when performing the operations of removing and installing parts, refer to the figure "Fuel tank". Withdrawal 1. Remove the fuel filler cap to relieve the...

Accelerator pedal cable and accelerator pedal — removal
Cable and accelerator pedal. 1 - adjusting bolt, 2 - throttle body side inner cable connection, 3 - grommet, 4 - accelerator pedal side inner cable connection, 5 -...

Emission control system — general information
The location of the components of the toxicity reduction system in the engine compartment. 1 - positive crankcase ventilation valve, 2 - canister purge solenoid valve, 3...

Forced crankcase ventilation system
Scheme of operation of the forced crankcase ventilation system (engine 2.7 l). System check 1. Disconnect the vent hose from the positive crankcase ventilation valve....

Evaporative Emission System
Evaporative Emission System Schematic Note: Checking the two-way and non-return valves is given in chapter " fuel injection system (MFI) ". System check 1. Disconnect...

Emission control system — troubleshooting by symptoms
Symptom Probable Cause elimination Engine does not start or starts with difficulty Disconnected or damaged vacuum hose. Faulty adsorber purge solenoid valve. Repair or...

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