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

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

Safety precautions when working on the fuel injection device
Start the engine only with the battery terminals securely tightened. Do not use any quick charger instead of a battery. When quickly charging the battery, disconnect it...

Relieve pressure in the fuel system
Typical Fuel Pump Connector Location fuel pump plug Scheme for connecting sensors of the injection system

Idle mode — check
Elements included in the fuel injection system 1 - oxygen sensor (Lambda probe); 2 - knock sensor; 3 - coolant temperature sensor; 4 - nozzle; 5 - valve for forced...

Throttle closed position switch — adjustment
Connect the tester to the diagnostic socket. Insert probe (2) 0.65 mm thick between the factory idle speed adjustment screw (3) and throttle lever (1). Turn the ignition...

Throttle closed position switch and gas pedal (accelerator) position sensor — adjustment
Connect the tester to the diagnostic socket. Insert probe (2) 0.5 mm thick between the accelerator lever (1) and throttle lever (3) to a depth of 3 mm. Turn the ignition...

Throttle lever — stop screw adjustment
Loosen the throttle cable tension. Loosen the locknut on the throttle lever stop screw. Turn the screw (1) counter-clockwise until the screw is extended to the required...

Idle speed — adjustment
Note: The idle speed is set at the factory with the idle speed screw. Check: that the spark plugs, injectors, idle speed control are in good order; that the compression...

Fuel Pump — Operation Check
If the fuel pump does not work, then check it according to the method below, and if it is working, check the power circuit. Turn the ignition key to the OFF position...

Intake manifold air temperature sensor — check
Air filter elements 1 - body; 2 - filter element; 3 - air flow sensor; 4 - gasket; 5 - filter; 6 - cover; 7 - resonator (1.8 l engines); 8 - gasket; 9 - air pipe; 10 -...

Coolant temperature sensor — check
Remove the coolant temperature sensor. Dip the sensor element in hot water and measure the resistance. Rated value: 2.1-2.7 kOhm (at 20°C); 0.26-0.36 kOhm (at 80°C). If...

Throttle position sensor (TPS) — check
Disconnecting the connector (1) throttle position sensor (2), measure the resistance between terminals 1 and 4 of the connector on the side of the sensor, which should...

Throttle closed position switch — check
With the throttle position sensor connector disconnected, check the circuit between terminals 3 and 4 of the throttle position sensor connector. When the pedal is...

Oxygen sensor — check
Disconnect the oxygen sensor connector (1) and connect a special tool to the connector on the sensor side (test lead harness). Check that the circuit between terminals 3...

Camshaft and crankshaft position sensors — removal and installation
Withdrawal Remove the timing belt. Remove the exhaust camshaft gear. Loosen the bolt and remove the bypass roller. Loosen the bolt and remove the camshaft position...

Knock sensor — removal and installation
Knock sensor fittings 1 - knock sensor; 2 - support; 3 - vacuum container. Withdrawal Remove the vacuum container and bracket. Loosen the screws and remove the heat...

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

Nozzle — removal and installation
Disconnect the ground wire from the battery. Relieve fuel pressure. Disconnect the crankcase ventilation hose. Disconnect the injector connectors. Loosen the bolts and...

Throttle body — removal and installation
Withdrawal Disconnect the ground wire from the battery. Drain the coolant from the cooling system. Remove the air filter. Disconnect the throttle cable (accelerator)....

Throttle body — disassembly and assembly
Models without TCL Throttle Body Elements 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 elements 1 - fuel tank; 2 - fuel quantity sensor connector; 3 - fuel quantity sensor; 4 - fuel pump; 5 - fuel return hose; 6 - discharge hose; 7 - filler cap;...

Fuel filter — replacement
Fuel filter fittings 1 - fuel filter; 2 - high pressure hose. Relieve pressure from the fuel line. Remove the air inlet hose. While holding the fuel filter with a...

Adjustment of a cable of gas (accelerator)
Gas cable fittings (accelerator) 1 - set screw; 2 - cable tip (throttle body connections); 3 - bushing; 4 - cable tip; 5 - cable; 6 - bracket; 7 - pin; 8 - withdrawal...

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

General description of the self-diagnosis system
Vehicles are equipped with the MPI engine management system, which controls the primary ignition circuit, fuel injection and engine idling from a single control unit....

Reading fault codes without a code reader
Attention: When carrying out certain check procedures, additional fault codes may be issued. You need to be careful that the codes issued during checks do not mislead...

Erasing fault codes without a code reader
Switch off the ignition and disconnect the negative cable from the battery for about 15 seconds. Connect the negative cable to the battery. Attention: The first...

Self-diagnosis with a fault code reader
A - self-diagnosis plug; B is a working battery that supplies voltage to the trouble code reader. Attention: During certain test procedures, additional fault codes may...

Carrying out checks
Use a DTC reader to interrogate the ECM for fault codes, or read the codes manually as described above. There are codes in memory If one or more fault codes are found,...