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So, Crankshaft Camshaft Sensors Are Both Required By Distributorless Ignition Systems. Modern engines rely on signals from both, to determine when to fire spark and inject fuel.

Consequently, The (ECM) uses signal pulses from both sensors to gain information:

  • To calculate when a particular cylinder is approaching top dead center.
  • To decide whether it is on a compression or an exhaust stroke.

But, If either signal is lost, the (ECM) may decide to shut down ignition, injection or both. Today, Sensor failures are extremely common on certain makes. It was not that long ago that a failed sensor would cause a no-start or an engine that just died. Today, many engines can overcome this problem with the limp home feature.

Above all, The relationship between the two signals is as important as the signals themselves. Some (DTC)s are related to the loss of camshaft/crankshaft signal correlation, or synch.

Common problems that can cause issues with (CMP)/(CKP) signals include:

  • Accumulation of magnetized debris on the sensor tip
  • Stretched timing belts and chains
  • Cracked flexplates and wiring/connector problems
  • Excessive end play on crankshafts/camshafts can also cause variations in the signal

Finally, Both sensors usually fail gradually, as the signal to the (PCM) weakens.

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