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What year, what engine?
 

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Server is slow tonight, sorry!!! You might need to have the ECM do a relearn after this change. Not sure I will check tomorrow, too tired tonight. Maybe server will be faster tomorrow.
 

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wow, thats actually amazingly simple...why cant every engine be like this?
 

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Crankshaft Position System Variation Learn
Note: The crankshaft position (CKP) system variation learn procedure is required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

• Engine replacement

• Engine control module (ECM) replacement

• Crankshaft damper replacement

• Crankshaft replacement

• CKP sensor replacement

• Any engine repairs which disturb the crankshaft to CKP sensor relationship

---------- Post added at 08:02 AM ---------- Previous post was at 07:54 AM ----------

Procedure for CKP relearn.

Install a scan tool.
Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
With a scan tool, select the CKP system variation learn procedure and perform the following:
3.1. Observe the fuel cut-off for the applicable engine.

3.2. Block the drive wheels.

3.3. Set the parking brake.

3.4. Place the vehicle's transmission in Park or Neutral.

3.5. Turn the air conditioning (A/C) OFF.

3.6. Cycle the ignition from OFF to ON.

3.7. Apply and hold the brake pedal for the duration of the procedure.

3.8. Start and idle the engine.

3.9. Accelerate to wide open throttle (WOT). The engine should not accelerate beyond the calibrated fuel cut-off RPM value noted in step 3.1. Release the throttle immediately if the value is exceeded.


Note: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.


3.10. Release the throttle when fuel cut-off occurs.

The scan tool displays Learn Status: Learned this Ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
 
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