P0315
DTC P0315
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
DTC Descriptor
DTC P0315
- Crankshaft Position (CKP) System Variation Not Learned
Circuit/System Description
The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight build tolerance variations in the CKP sensor, crankshaft, and CKP 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 has been performed. If the actual crankshaft position variation is not stored within the CKP compensating value look up table, DTC P0300 may set. If the CKP system variation values are not stored in the ECM memory, or a proper ECM power down does not occur after completing the CKP learn procedure, DTC P0315 sets.
Conditions for Running the DTC
The diagnostic runs continuously.
Conditions for Setting the DTC
The ECM detects that the CKP system variation values are not stored in memory.
Action Taken When the DTC Sets
DTC P0315 is a Type A DTC.
Conditions for Clearing the MIL/DTC
DTC P0315 is a Type A DTC.
Diagnostic Aids
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test Battery Inspection/Test.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearningfor scan tool information
Circuit/System Verification
1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description Hybrid Modes of Operation.
2. Ignition ON, verify the scan tool hood position parameter displays Open.
• If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.
Circuit/System Testing
Important: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned.
1. Perform the CKP System Variation Learn Procedure. Refer to Crankshaft Position System Variation Learn Testing and Inspection.
2. Ignition OFF. If the CKP System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
* Any worn crankshaft main bearings
* A damaged or misaligned reluctor wheel
* Excessive crankshaft runout
* A damaged crankshaft-Refer to Crankshaft and Bearing Cleaning and Inspection 32. Crankshaft and Bearing Cleaning and Inspection.
* Interference in the signal circuit of the CKP sensor
* The ignition switch is left in the ON position until the battery is discharged
* An ECM power disconnect, with the ignition ON, that may have erased the CKP system variation values and set DTC P0315
* Any debris between the CKP sensor and the reluctor wheel
• If the ECM is still unable to complete the Learn Procedure, replace the ECM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Programming and Relearningfor ECM replacement, setup, and programming