Posts Tagged: crank relearn

Crankshaft Sensor Relearn

Crankshaft Sensor Relearn — why it’s required Why you must perform a crankshaft sensor relearn after replacing the crankshaft sensor A crank relearn is a process that the PCM goes through to recalibrate its knowledge of the relationship between the crankshaft and camshaft. That’s necessary because the crankshaft and camshaft are connected by a timing chain or timing belt. Over time, the timing chain/belt can stretch and that stretch changes the relationship and timing between the crankshaft and camshaft. If the change/stretch is great enough, the PCM will notice discrepancies … Read More