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DTC P0315 - FX3

The crankshaft position sensor system variation learn feature is used to calculate reference period errors caused by slight build tolerance variations in the crankshaft position sensor, crankshaft, and crankshaft position sensor position. The calculated error allows the engine control module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wide range of engine speeds and load conditions. The ECM stores the crankshaft position system variation values after a learn procedure, which is performed automatically by the ECM. If the CKP system variation learn values exceed thresholds, DTC P0315 sets.

The ECM detects that the crankshaft tooth error has not been learned or is out of range.

DTC P0315 is a Type A DTC.

DTC P0315 is a Type A DTC.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Note: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned.

Perform the Crankshaft Position System Variation Learn .

1. If the scan tool displays NOT learned this ignition, inspect for the following conditions:

•	A worn or damaged crankshaft or crankshaft bearings

•	Debris between the CKP sensor and the reluctor wheel

•	A damaged reluctor wheel

•	Excessive crankshaft runout

•	Any interference of the CKP sensor or CKP sensor signal to the control module

2. If the control module is unable to complete the learn procedure, replace the control module.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for engine control module replacement, setup, and programming.