A no-start condition is being described on an engine equipped with a coil-on-plug ignition system. Technician A says that a bad CKP (crankshaft position) sensor could be the cause. Technician B says that an open spark plug wire could be the cause. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

In a coil-on-plug ignition system, the CKP sensor provides the engine's timing and position information to the PCM (powertrain control module), which in turn controls the ignition coils. If the CKP sensor is bad, the PCM may not be able to accurately control the ignition coils, which could result in a no-start condition. An open spark plug wire would only affect one cylinder, not the entire engine, and would not likely cause a no-start condition on all cylinders. Therefore, technician A is correct and technician B is incorrect.

A No-Start Condition Is Being Described on an Engine Equipped