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Crankshaft Learn Procedure (2.2L)

  1. The Powertrain Control Module (PCM) uses crankshaft velocity calculations to determine engine misfire and to operate engine misfire self-diagnostics. PCM must know precisely the variation between notches on the crankshaft. PCM contains crankshaft learn procedure which learns the variation between notches on crankshaft. The crankshaft learn procedure must be reset if PCM, crankshaft, or crankshaft position sensor are replaced.
  2. Start engine and allow engine to reach at least 158°F (70°C). Turn A/C off and place transmission in Park or Neutral. Using scan tool, perform CRANKSHAFT POSITION VARIATION LEARN. Accelerate engine to 4000 RPM. When fuel cut occurs, release throttle. PCM learns crankshaft as engine decelerates.
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