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No,both of them would fire at same time . The PCM supply's a pulsating ground PWM - pulse width modulation . You probably have a fried injector driver inside the PCM - engine computer.
PWM (Pulse Width Modulation) technique, so when the injector gets a signal from the control unit to open an electromagnet moves a plunger allowing the pressurized fuel coming out in a picture of very fine droplets, and this happens when the fuel passes through a very highly engineered nozzle that atomizes the fuel to make it easy to burn, the amount of the fuel determined by the amount of time the nozzle is opened (Pulse Width).
Replace the computer and have dealer program it .
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Thanks Jeff
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It's a fused circuit, so check the fuse, probably under hood, labeled injector. A shorted injector can shut down the injector drive circuit, so pull off all injector connectors, make sure fuse is good, then check for power to the injectors. Injector circuit should nave hot wire anytime key is on. Has constant voltage to injectors. When the computer internally grounds the injector ground wire, the injector will pulse.
the pcm monitors fuel requirements through sensors so it knows how much fuel is needed to keep the motor running under different demands depending on what or how the driver is driving the car.the pcm grounds the injector circuit while supplying power to the injector all the time the key is on.when the pcm grounds the injector,it opens it allowing fuel to enter cylinder to be burnt for the on time(open injector) that is required for the demand on the motor.
When you turn on the ignition, power is provided to one side of the injectors. When you start the car and it is running, the computer grounds the other side of the injectors. The length of time that the computer grounds the injector is known as the pulse width. This "time" determines how much fuel is released from the injector for any particular engine cycle.
At injector's, need to check if you have ground pulsation, to check, connect test light on pos (+) battery terminal, now your set to check ground, at injector harness, probe wire's, while some one cranks engine, look for pulsation, if you don't have pulsation, it will need a computer, injector pulsation is control by the computer, if no pulsation, then no fuel can get into cylinder.
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