1.2L REVOTRON TWIN CYLINDER CNG ENGINE 203 III. GASOLINE FUEL INJECTORS : Component Details : Injectors are normally closed valve. Injector opens when its electromagnetic coil is energized by the EMS ECU. Component Location : Preliminary Checks : 6. Loose/ Damaged Connections between injector and EMS ECU. 7. Check for back out of pins at both Injector connector and ECU connector. 8. Check for damage of pins at both injector connector and ECU connector. 9. Check the continuity from injector connector pins to the ECU pins. Connector View : Connector Details: Connector Description 1 Ground 2 Supply Component Specification : The injector is an indirect electrically driven valve (nozzle) that sprays high pressure fuel in an engine combustion chamber. The fuel delivery is a function of the pressure at the nozzle seat. Functional Characteristics:- A:- Pressure Range:- Min operating pressure:- The injector starts to inject at an inlet pressure ± 4 bar Max normal operating pressure:- The maximum nominal operating inlet pressure under normal conditions is 4 bar. Max peak operating pressure:- The injector is able to endure up to 4 bar inlet pressure for 10 hours and the injector characteristics remain within original tolerances when a normal operating pressure is used after this condition. The fuel injector is solenoid ball valve, top feed with a 2 pin connector. The solenoid valve normally closed by a ball and a cone seat, opens when the electromagnetic core is energized. Fuel under pressure in common rail flows through metering orifice, where fine atomization of the fuel takes place and flows consistently for a given injector opening time. The injector which is normally in closed position, receives drive signal from ECU to open for a given pulse width (few milli seconds), depending on the engine operating conditions. Sensor Stand alone Diagnosis : Connector details : Injector 1 1. ECU pin M2H2 : signal 2. supply voltage - 12V Injector 2 1. ECU pin M2G3 : signal 2. supply voltage - 12V Injector 3 1. ECU pin M2G2 : signal 2. supply voltage - 12V Injector 4 1. ECU pin M2H3 : signal 2. supply voltage - 12V Use multimeter to check coil resistance which should be 12.25ohms ± 0.5ohms
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