Crankshaft Relearn Ability

The PCM uses crankshaft velocity calculations to determine misfire and run misfire self-diagnostics. The PCM must know precisely the variability in crankshaft notches for this function. The PCM has a "notch learn" process that learns the variability between notches which must be reset if the crankshaft in the engine is replaced. With use of the scan tool, the crankshaft learn procedure can be set to relearn.

IMPORTANT: Do not transfer PCM's from one vehicle to another. The learned crankshaft notches will be different from one vehicle to another.