VAZ-21044 cars with fuel injection system (VAZ-21051)

Some VAZ-21044 vehicles are equipped with a 1.7-liter engine with a central fuel injection system. In this system, fuel is injected by one nozzle into the central injection unit installed instead of the carburetor. Here, the fuel is mixed with air and fed into the engine cylinders as a combustible mixture through the intake pipe.

The fuel injection system in combination with a catalytic converter in the exhaust system allows to reduce the toxicity of exhaust gases while improving the driving performance of the car.

This chapter provides only a brief description of the general principles of the design, operation and diagnostics of fuel injection systems, the procedure for removing and installing units, and also provides the features of repairing the engine itself. The design, repair and diagnostics of the system using special devices and diagnostic cards are described in detail in a separate "Manual for repairing the central fuel injection system".

Caution: Before removing any injection control system components, disconnect the wire from the (-) terminal of the battery.

Caution: Do not start the engine if the battery cable terminals are not tightly tightened.

Caution! Never disconnect the battery from the vehicle's electrical system while the engine is running.

Attention! When charging the battery, disconnect it from the vehicle's electrical system.

Attention! Do not expose the electronic control unit (ECU) to temperatures above 65°C when operating and above 80°C when not operating (for example, in a drying chamber). It is necessary to remove the ECU from the car if this temperature is exceeded.

Caution! Do not disconnect or connect the wiring harness connectors to the ECU when the ignition is on.

Caution! Before performing electric arc welding on a vehicle, disconnect the wires from the battery and the wire connectors from the ECU.

Attention! Perform all voltage measurements using a digital voltmeter with an internal resistance of at least 10 MOhm.

The material is posted on the online resource: VAZBOOK.RU

Warning! The electronic components used in the injection system are designed for very low voltage and can therefore be easily damaged by electrostatic discharge. To prevent damage to the ECU by electrostatic discharge:

• do not touch the ECU connectors or electronic components on its boards with your hands;
• when working with the control unit ROM, do not touch the microcircuit terminals.