If a vehicle has a 'crank but won't start' condition, what might be a reason for no injector pulses?

In a scenario where a vehicle exhibits a "crank but won’t start" condition and lacks injector pulses, understanding the role of various components is crucial. The absence of injector pulses typically indicates that the engine control module (ECM) isn’t signaling the fuel injectors to open. This can occur for several reasons, including an issue with the ECM itself, wiring problems, or a fault in the engine’s sensor inputs, such as the crankshaft position sensor.

The option stating that the vehicle needs a computer suggests that the ECM is malfunctioning or missing entirely. However, modern vehicles are designed with onboard computers (ECMs) integral to their operation, so it’s improbable that the vehicle could completely lack a computer under normal circumstances.

Similarly, while an ignition module is critical for generating spark in the ignition system, it does not directly affect the fuel injectors. If the engine is cranking, it suggests that there is at least some functionality in the ignition system; thus, needing an ignition module would not directly correlate to a lack of injector pulses.

Taken together, both the suggestions of needing a computer and needing an ignition module do not address the underlying causes of no injector pulses accurately and do not hold weight in this context; therefore, asserting that