Your injectors are fired off of the ECU and the ECU gets it's signal from the cam sensor. You need to check your inputs to the ECU. If it is getting the signal but not sending the signal out to the injectors, you might have a bad ECU. Make sure you get a pin out diagram and verify all of your inputs and grounds before spending the $$ for an ECU, but if it has everything it needs to do its job and still not sending out to the injectors there can only be one conclusion.
SOURCE: 1999 ford taurus
check the fuel pump itself.. if no fuel going through lines... injectors won't work.
SOURCE: Fuel injector won't allow gas to flow into engine,
Test fuel injector pulse and supply voltage output (test is used for most cars). This test will tell you if the computer system has operating voltage and injector trigger signal. Remove an electrical connector from a fuel injector (it doesn't matter which injector) probe both sides of the connector with a grounded test light
(there are only two terminals). Have a helper turn the key to the "on" position without cranking the engine and observe the test light. The test light should illuminate one side of the connector only. Next, switch the test light lead to the positive side of the battery to test the system ground injector trigger, probe the side of the connector that did not light up, have a helper crank the engine over and observe the test light, it should blink on and off. If this test checks ok continue to next step. (Note: if no injector pulse is present try disconnecting the remainder of injectors and re-test, if a fuel injector is shorted it can shut down the injector driver causing no injector pulse. If injector pulse returns plug injectors electrical connectors in one at a time until the pulse fails and replace that injector)
If this test revealed that there was no pulse but system has power the ECM is not generating a fuel injector trigger. If there is no trigger to the fuel injector it will not allow fuel to enter into the engine. Some of the most popular reasons that can cause this condition include a shorted crankshaft angle sensor, shorted camshaft position sensor or shorted ECM/PCM. (When a system trouble code scan is performed it does not always catch a crankshaft angle sensor, camshaft position sensor failure). Tip: try disconnecting all non-essential sensors, example: oxygen sensor, coolant sensor, throttle position sensor, air intake temperature sensor, mass air flow or map sensor and EGR valve pressure differential sensor. Crank the engine over, if the injector pulse returns, one of the sensors is shorted causing the system to not operate. Plug the sensors in one at a time until the injector pulse fails then replace that sensor and reassemble.click on this link directly for more details
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SOURCE: 2001 honda civic ex,wont start, no injector pulse,
Injector pulses are sent from the engines computer. Have that checked out
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