Determination of malfunctions of the gasoline injection system and their elimination

Almost all malfunctions of the electronic injection control system can only be found with the help of special instrumentation. Before searching for the cause of a malfunction, the following troubleshooting conditions must be met, namely:

• A) Wrong actions when starting the engine are excluded. Whether the engine is cold or warm, do not press the accelerator pedal when starting the engine.
• b) The tank must be filled with fuel, there is no mechanical damage to the engine, the battery is charged, the starter rotates with a sufficient number of revolutions, the ignition system is in good condition and adjusted, the fuel system is tight, there are no impurities in the fuel supply system, crankcase ventilation is in order, electrical wire «masses» (-) (engine - gearbox - body) connected. Print out the fault codes registered by the self-diagnosis system in the workshop.

Attention! Before disconnecting the fuel lines, clean the fuel lines with a cleaning agent or gasoline. Cover the joints with rags to prevent spillage of fuel.

Engine won't start

The fuel pump does not work when the starter is running (can't hear his noise).

• Check the voltage supply to the fuel pump. Check contacts

Defective fuel pump fuse

• Check fuse

Faulty fuel pump relay

• Check Relay

No power to valve injectors

• Disconnect the valve injector plugs. Connect the tester with a control diode bulb to the power wires of the valve injectors and press the starter. The control lamp should flash.

A cold engine does not start well. Runs uneven

Faulty coolant temperature sensor or intake air temperature sensor

• Check sensors

The engine runs with skips

Fuel pump power failure

• Check the plug connections and contacts of the fuel pump, as well as the relay.

Clogged fuel filter

• Replace fuel filter

Faulty fuel pump

• Check the fuel pump and replace if necessary.

Faulty valve injector

• Check valve injectors and replace if necessary.

The engine is unstable in transient conditions

Leaky air intake system

• Check the air intake system. To do this, leave the engine to idle and lubricate the joints and seals of the intake tract with gasoline. If the speed increases, repair the leak.

Attention! Gasoline vapors are poisonous. Do not inhale!

Leaky fuel system

• Check visually all connections near the engine and electric fuel pump. Tighten all threaded connections.

Warm engine won't start

Too high pressure in the fuel system

• Check the pressure, replace the pressure reducing valve if necessary

Return hose between pressure reducing valve and fuel tank blocked or kinked

• Clean or replace return hose