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DTC P0315 - Crankshaft Position System Variation Not Learned

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DTC DESCRIPTION P0315 - CRANKSHAFT POSITION SYSTEM VARIATION NOT LEARNED

Description:  The PCM has not learned the crankshaft pulse wheel tooth spacing. This DTC disables the misfire monitor.
Possible Causes: 
  • Aftermarket performance products
  • Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
  • PCM reprogramming
  • PCM replacement
  • Internal PCM non-volatile random access memory (NVRAM) error
Diagnostic Aids:  The misfire monitor neutral profile correction must be relearned after any engine rotational component installation or repair.
Carry out the Misfire Monitor Neutral Profile Correction procedure using the scan tool.
Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Neutral Profile Correction.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
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