Hyundai Accent (HC): Engine Control System / Injector

- Description A DPI (Dual Point Injection) system means a system with two injectors in one cylinder (intake port) and has a total of eight injectors.The injector is an electronically controlled fuel injector, a solenoid valve that supplies precisely calculated fuel to the engine in spray form for the optimal combustion. This helps satisfy various engine operating conditions. For better fuel efficiency, engine performance and reduced emissions, the ECM (Engine Control Module) adjusts the fuel injection quantity by controlling the operation time and the number of injectors to operate, based on the intake air quantity that enters the cylinder and air-fuel ratio in the exhaust. This helps the engine control system to meet the required air-fuel ratio. In order to guarantee an enhanced control, the injector is required to respond quickly and its spraying function is the key to achieve complete combustion.

1.Turn ignition switch OFF.

2.Disconnect injector connector.

3.Measure resistance between injector terminals 1 and 2.

4.Check that the resistance is within the specification.

• In case of removing the high pressure fuel pump, high pressure fuel pipe, delivery pipe, and injector, there may be injury caused by leakage of the high pressure fuel. So don't do any repair work right after engine stops.

1.Turn the ignition switch OFF and disconnect the battery negative (-) cable.

2.Release the residual pressure in fuel line.(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

3.Disconnect the harness wiring & injector connector.

4.Remove the installation nut, and then disconnect the fuel feed tube (A).

Delivery pipe installation nut (↔ Fuel feed tube) : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

5.Remove the installation bolt (A), and then remove the delivery pipe & injector assembly from the engine.

Delivery pipe installation bolt :19.6 ~ 24.5 N.m (2.0 ~ 2.5 kgf.m, 14.5 ~ 18.1 lb-ft)

6.Remove the fixing clip (A), and then separate the injector from the delivery pipe.

• Install the component with the specified torques.

• Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

• Apply the engine oil to the injector O-ring.

• Inspect the top of the injector for debris that could damage the filter mesh.

• Inspect the underside of the injector for bending in interference between other parts.

• After assembling the injectors, inspect and remove any magnetic materials that may affect the magnetic circuit.

• Inspect the injector O-ring when installing.

1.Install in the reverse order of removal.