Electrical wiring or battery and/or alternator failures can deprive the ECM of power and your car will shut down. The ECM will cease to operate if its 12 volt electrical power source fails. #3 – Wiring ProblemĪ broken or detached wire anywhere in this control circuit can prevent power to the coils and cause your engine to run poorly or stop. The engine, if running, will suddenly stop. When this happens no timing signal will be sent to the ECM. #1 – ECM ProblemĪ failure of the ECM to provide a properly timed electrical signal will cause your engine to run poorly or stop. Several different problems can cause this interruption. Interruption of this precisely timed spark at each of the spark plugs can cause your engine to either run poorly or stop. Proper timing of this burst of power is determined by a signal from the engine crank position sensor. ![]() The coils then develop high voltage (25,000+ volts) which is sent to each spark plug generating the fuel igniting spark. It does so by sending properly timed pulses of 12 volt electrical power to each of the spark coils. Related: ECU vs ECM vs PCM vs TCM (What’s the Difference?) This module, a complex computer, signals the ignition system when to fire the spark plugs. In a modern car the ignition system is driven by the Engine Control Module (ECM) or Powertrain Control Module (PCM). The term ‘spark’ refers to the high voltage electrical spark generated by the ignition system at each of the spark plugs that ignites the fuel enabling the engine to run. Click through those links for specific symptoms to look for with each part. This may be a precursor to the second and more critical one, when your engine will quit and you will coast to a stop.Ĭommon points of failure include a bad fuel pump, clogged fuel filter, or bad/clogged fuel injectors. When fuel system problems crop up, two modes of failure are possible. ![]()
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