What would happen to the engine if the ECM does not receive a speed or timing signal?

Study for the 310T Engine and Supporting Systems Test with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What would happen to the engine if the ECM does not receive a speed or timing signal?

Explanation:
When the ECM has no speed (crankshaft) or timing signal, it has no reference for engine position or rotation rate. Fuel injection and ignition timing are synchronized to those signals, so without them the ECM won’t fire the injectors or spark at the proper moments. During cranking, the starter may turn the engine, but without a valid timing reference, the ECM cannot deliver fuel or ignition correctly, so the engine cannot reach combustion and will not start. The result is cranking without starting.

When the ECM has no speed (crankshaft) or timing signal, it has no reference for engine position or rotation rate. Fuel injection and ignition timing are synchronized to those signals, so without them the ECM won’t fire the injectors or spark at the proper moments. During cranking, the starter may turn the engine, but without a valid timing reference, the ECM cannot deliver fuel or ignition correctly, so the engine cannot reach combustion and will not start. The result is cranking without starting.

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