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 Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P0315
- Crankshaft Position 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, then 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, then DTC P0315 sets.

Conditions for Running the DTC

The diagnostic runs continuously when the ignition is ON.

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 code.

Conditions for Clearing the MIL/DTC

DTC P0315 is a Type A code.

Diagnostic Aids

* To ensure the battery pack has sufficent state of charge to get CKP system variation values with the lowest engine noise present, perform this procedure when the Hybrid/EV Battery Pack State Of Charge parameter is at least 40%.
* DTC P0315 may set after the flashing of other vehicle modules has been performed.

Reference Information
Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation

Hybrid Modes of Operation Description Hybrid Modes of Operation Description
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Note: The crankshaft position sensor system variation learn procedure may have to be repeated up to 5 times before the procedure is learned.

1. Perform the Crankshaft Position Variation Learn procedure. Refer to Crankshaft Position System Variation Learn Crankshaft Position System Variation Learn.
2. If the crankshaft position variation learn procedure cannot be performed successfully, inspect for the following conditions:

* The Service Mode is active, until the battery is discharged
* Interference in the signal circuit of the B26 crankshaft position sensor
* Any debris between the crankshaft position sensor and the reluctor wheel
* A damaged or misaligned reluctor wheel
* Any worn crankshaft main bearings
* Excessive crankshaft runout
* A damaged crankshaft
* An ECM power disconnect, with Service Mode active, that may have erased the crankshaft position sensor system variation values and set DTC P0315

• If the ECM is still unable to complete the learn procedure, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for ECM replacement, setup, and programming