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Crank Relearn / Crankshaft Variation Learn Procedure

After replacing the crankshaft position sensor, PCM, or on some GM/Ford models after battery disconnect, the ECU must relearn crankshaft position variation for misfire detection.

After replacing the crankshaft position sensor, PCM, or on some GM/Ford models after battery disconnect, the ECU must relearn crankshaft position variation for misfire detection.

Systems involved

  • Engine management
  • Crankshaft position sensor
  • Misfire detection

Step-by-step procedure

  1. Install all parts correctly and clear stored codes.
  2. Connect TOPDON scanner and locate Crank Relearn / Case Learn / Variation Learn in service menu.
  3. Some vehicles require a specific drive cycle; others use stationary relearn with throttle steps.
  4. Follow manufacturer prompts — often idle for 2 minutes, then hold RPM at specified value.
  5. Do not shut off ignition until the scanner confirms relearn complete.
  6. Road test and verify P0315 or crank-related codes do not return.

Important warnings

  • Incomplete crank relearn causes false misfire codes and rough running.
  • Procedure varies significantly by make — always follow on-screen TOPDON instructions for your VIN.

Related guides

<a href="/oil-reset-service-light/">How to Reset the Oil Service Light with a TOPDON Scanner</a> · <a href="/sas-steering-angle-calibration/">Steering Angle Sensor (SAS) Calibration Guide</a>

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Questions fréquentes

Which TOPDON scanner supports this procedure?
See the recommended tools below — service function availability varies by vehicle make, model, and year. Verify compatibility before purchase.
Do I need a dealer tool for crank relearn / crankshaft variation learn procedure?
Many modern vehicles require a scan tool with service functions. TOPDON scanners listed below support this procedure on compatible makes and models — always confirm in your service manual.