A coil of wire inside each injector acts as an electromagnetic valve. Whenever an injector is electrically pulsed by a ECM, the electromagnetic valve opens, allowing fuel to be injected into the engine's intake manifold.
The fuel injection rate is controlled by an ECU, which calculates the amount of fuel to be injected based on the signals from the sensor that detects the amount of air intake and controls the length of time to keep the fuel injection valves (injectors) open.
A bad ECU is another fuel injector problem not directly from the injector. The ECU is the engine control unit that runs your combustion system. If there is a problem with your ECU, it may not be able to tell the fuel injectors how to property mix and deliver the air and fuel to the combustion chambers.
The injector control pressure sensor detects the pressure of the fuel feeding the injectors, and sends that signal to the computer so that it can make the adjustments for optimum performance and efficiency.
The amount of fuel supplied to the engine is determined by the amount of time the fuel injector stays open. This is called the pulse width, and it is controlled by the ECU. The injectors are mounted in the intake manifold so that they spray fuel directly at the intake valves.
It's the ECM's job to ensure the right amount of fuel is being injected. It does so by collecting and processing readings from various sensors.
The optimum value for injection pressure is coordinated by the ECM according to the engine speed and load conditions. With some engine management systems, the pressure regulator acts as a fuel temperature sensor.
Fundamentally, the engine ECU controls the injection of the fuel and, in petrol engines, the timing of the spark to ignite it. It determines the position of the engine's internals using a Crankshaft Position Sensor so that the injectors and ignition system are activated at precisely the correct time.
The ECU (engine control unit) uses sensors to work out the right time to fire the injectors and spray fuel into the combustion chamber.
Engine Stalling or Misfiring – A bad or malfunctioning engine control module can also cause erratic and unpredictable engine stalling or misfiring. This is because the ECM controls the fuel pump, fuel injector, spark plugs, and transmission—all the parts you need working correctly for your engine to run smoothly.
The most common trouble codes with the check engine light are: Codes: P0171 through P0175 (sensing your oxygen levels) Codes: P0300 through P0305 (engine misfires) Codes: P0411, P0440, P0442, P0446, and P0455 (evaporative system)
The installation of the injectors won't require you to reset the Ecu or do anything to the Ecu.
The major functions of the ECM in a modern diesel engine include (i) controlling the timing and amount of fuelling, (ii) controlling emission reduction devices, and (iii) de-rating the engine to protect the engine components.
The ECM (Engine Control Module) controls the fuel injectors in most electrical diesel engines. The diesel injectors constantly have power when the key is turned on regardless if the engine is turned over. The ECM grounds the injector, completing the circuit and causing the injector nozzle to open.
An injection pump is often driven indirectly from the crankshaft by chains, gears or a timing belt that also moves the camshaft. The timing of the pump determines when it will inject fuel into the cylinder as the piston reaches the BTDC point.
There are many reasons for faulty fuel injectors but the three most common issues are clogging in your car's fuel injectors, leaky and dirty injectors. You should remove the fuel injectors and clean them up before putting them back in for your car to function optimally.
A failing FICM can cause all sorts of problems, but one of the most common symptoms is an engine that is hard to get started, especially when the engine is cold or has sat overnight.
A car's ECU is primarily responsible for four tasks. First, the ECU controls the fuel mixture. Second, the ECU controls idle speed. Third, the ECU is responsible for ignition timing.
Fuel Injector Control Modules (FICM), located on the engine valve cover are subject to intense heat and vibration.
Engine Lags or Surges
For example, if your engine isn't getting enough fuel because the faulty ECU has thrown off the air/fuel mixture, your vehicle will lag or stutter when you step on the accelerator. Too much fuel can make your engine surge and reduce your fuel economy.
Because ECMs are electrical systems, they're subject to short-circuits, power surges, and other failures that plague electronics. The most common source of ECM failure is in one of the wiring harnesses.
The ECM monitors most of the sensors in the engine bay in order to manage your vehicle's air-fuel mixture and regulate the emission control systems. The ECM regulates four main parts of your vehicle's operating systems: air-fuel ratio, idle speed, variable valve timing, and ignition timing.