Professional technicians, use a tool called a NOID light to check injector pulses. If resistance is outside specifications (high or low), replace the injector. Unplug the injector and measure the resistance, between the two terminals. TIP: You can also measure the resistance of each injector with an ohmmeter. If the engine starts when a particular injector has been unplugged that’s the shorted injector that needs to be replaced. TIP: Try unplugging the injectors one at a time and crank the engine to see if it will start.
As a result, killing any other injectors, that also share that same driver circuit. On the other hand, too much current flow to an injector may cause the (PCM) injector driver circuit to shut down. So, if the specification calls for 3 ohms and an injector measures only 1 ohm it will pull more current. Typically, when injectors fail, the solenoids often short internally, causing a drop in resistance. Checking Fuses And Voltage If the fuse is okay, try swapping the relay with another to see if that gets voltage to the injectors. But, if the fuse still blows you will need to check the wiring harness, for damage and repair it. Once the system is identified inspect or replace the failed part and retry the engine. So, if there is a blown fuse, check the system it controls.
Engine Will Not Start - But, Fuel Pump, Spark And Compression Are Good All engines require three things to start and run, spark, fuel and compression.