Fuel injection system (MPI) of a car Hyundai Elantra 1

General description of the fuel injection system (MPI)
Note: Due to the large number of modifications of MPI fuel injection systems installed on vehicles, this chapter provides information that applies to all vehicles in...

Safety precautions when working with the fuel injection device
Only start the engine with the battery terminals securely tightened. Do not use any quick chargers instead of the battery. When quickly charging the battery, disconnect...

Relieving pressure in the fuel system
Typical location of fuel pump connector Fuel pump plug Connection diagram of injection system sensors

Idle mode — check
Components of the fuel injection system 1 - oxygen sensor (lambda probe); 2 - knock sensor; 3 - coolant temperature sensor; 4 - nozzle; 5 - crankcase ventilation valve;...

Throttle Closed Position Switch — Adjustment
Connect the tester to the diagnostic connector. Insert a 0.65 mm thick feeler gauge (2) between the factory idle speed adjustment screw (3) and the throttle lever (1)....

Closed throttle position switch and accelerator pedal position sensor — adjustment
Connect the tester to the diagnostic connector. Insert a 0.5 mm thick feeler gauge (2) between the accelerator lever (1) and the throttle lever (3) to a depth of 3 mm....

Throttle lever — adjusting the position of the stop screw
Loosen the throttle cable tension. Loosen the lock nut of the throttle lever stop screw. Turn the screw (1) counterclockwise until the screw extends to the required...

Idle speed — adjustment
Note: The idle speed is adjusted at the factory using the idle speed adjustment screw. Check: that the spark plugs, injectors, and idle speed controller are in good...

Fuel pump — checking operation
If the fuel pump is not working, check it using the following method, and if it is working properly, check the power supply circuit. Turn the ignition key to the OFF...

Intake Manifold Air Temperature Sensor — Check
Air filter elements 1 - body; 2 - filter element; 3 - air flow sensor; 4 - gasket; 5 - filter; 6 - lid; 7 - resonator (1.8L engines); 8 - gasket; 9 - air duct; 10 - air...

Coolant Temperature Sensor — Check
Remove the coolant temperature sensor. Place the sensitive element of the sensor in hot water and measure the resistance. Nominal value: 2.1-2.7 kOhm (at 20°C);...

Throttle Position Sensor (TPS) — Check
After disconnecting the connector (1) of the throttle position sensor (2), measure the resistance between terminals 1 and 4 of the connector on the sensor side, which...

Closed Throttle Position Switch — Check
After disconnecting the throttle position sensor connector, check the circuit between terminals 3 and 4 of the connector on the throttle position sensor side. When the...

Oxygen sensor — check
Disconnect the oxygen sensor connector (1) and connect the special tool to the connector on the sensor side (test lead harness). Check that the circuit between terminals...

Camshaft and crankshaft position sensors — removal and installation
Removal Remove the timing belt. Remove the exhaust camshaft gear. Loosen the bolt and remove the idler pulley. Loosen the bolt and remove the camshaft position sensor....

Knock sensor — removal and installation
Knock sensor mounting elements 1 - knock sensor; 2 - support; 3 - vacuum container. Removal Remove the vacuum container and bracket. Loosen the bolts and remove the heat...

Injector — check
Fuel system components 1 - lower washer; 2 - nozzle; 3 - bushing; 4 - gasket; 5 - high pressure hose; 6 - air intake hose; 7 - throttle position sensor; 8 - throttle...

Injector — removal and installation
Disconnect the ground cable from the battery. Relieve the fuel pressure. Disconnect the positive crankcase ventilation hose. Disconnect the injector connectors. Loosen...

Throttle body — removal and installation
Removal Disconnect the ground cable from the battery. Drain the coolant from the cooling system. Remove the air filter. Disconnect the gas pedal cable (accelerator)....

Throttle body — disassembly and assembly
Non-TCL models Throttle body components 1 - idle speed controller housing; 2 - gasket; 3 - throttle body; 4 - throttle position sensor; 5 - idle speed controller....

Fuel tank — removal and installation
Fuel tank components 1 - fuel tank; 2 - fuel quantity sensor connector; 3 - fuel quantity sensor; 4 - fuel pump; 5 - fuel return hose; 6 - discharge hose; 7 - filler...

Fuel filter — replacement
Fuel filter mounting elements 1 - fuel filter; 2 - high pressure hose. Relieve pressure from the fuel line. Remove the air intake hose. While holding the fuel filter...

Adjusting the gas (accelerator) cable
Gas cable mounting elements (accelerator) 1 - Set screw; 2 - cable tip (connections to the throttle body); 3 - bushing; 4 - cable tip; 5 - cable; 6 - bracket; 7 - pin; 8...

Fuel pump — replacement
Raise the rear seat cushion. Remove the protective cover (1). Typical fuel pump location Relieve any residual pressure in the fuel line. After disconnecting the fuel...

Diagnostics of faults of the fuel injection system

General description of the self-diagnostic system
The vehicles are equipped with an MPI engine management system, which controls the primary ignition circuit, fuel injection and engine idle from a single control unit....

Reading fault codes without a code reader
Caution: Additional fault codes may be generated when performing certain testing procedures. Care must be taken to ensure that the codes issued during checks do not...

Clearing fault codes without a code reader
Turn off the ignition and disconnect the negative battery cable for approximately 15 seconds. Connect the negative cable to the battery. Caution: The first drawback when...

Self-diagnosis using a trouble code reader
A - self-diagnosis plug; B is a working battery that supplies voltage to the trouble code reader. Note: Additional fault codes may be generated when certain testing...

Conducting inspections
Use a trouble code reader to query the electronic control module for trouble codes, or read the codes manually as described above. There are codes in memory If one or...

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Elantra 3 (2000-2006)