When these fuses blow, the system they support stops working and the engine stops running.Īs a result, the engine will not start. They help the fuel pump, fuel injection and computer systems from suffering a short circuit. Fuses are used to protect various electrical circuits, while supplying power to components. So, the injector fuse and relay are usually located in the relay box or power distribution center in the engine compartment. A fault in the wiring harness to the injectors. First, Check For Voltage At The Injectors, When The Key Is Turned Or Button Pushed. So, if there are problems with how the (PCM) performs these functions, the vehicle may not run. The (PCM)’s functions include positioning the crankshaft and controlling the ignition spark and timing. In some cases, a (PCM) problem, will cause the vehicle, not to run at all. In extreme cases, the (PCM) may have failed. When you turn on the key or push the button, the injectors should receive battery voltage.Īlso, the (PCM) driver circuit, provides the ground connection, to energize the injectors. So, a worn-out belt can prevent the Crankshaft-Camshaft Position Sensor from synchronizing causing the sensor to send the wrong signal. The (PCM) uses the trigger signal from the crankshaft position sensor and/or camshaft position sensor to pulse the injectors. So, the most likely cause, is that the fuel injectors are probably not opening. The fuel pump is running and delivering normal pressure to the engine.īut, With All That Working, Still, Your Engine Will Not Start. Like Most People, You Checked The Most Important Things First: Basic Checks For Engine Will Not Start Are: Your engine will not start, is an all too familiar experience, for any vehicle owner. So, it’s important to understand, what it takes to make a engine start and run. With a engine will not start issue, the possible causes are plenty. So, if any one of these is missing, your engine will not start. 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.
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