For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC P0315 00: Crankshaft Position System Variation Not Learned

### Circuit/System Description

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 has been performed. If the actual crankshaft position variation is not stored within the crankshaft position sensor compensating value look up table, then DTC P0300 00 may set. If the crankshaft position sensor system variation values are not stored in the ECM memory, or a proper ECM power down does not occur after completing the crankshaft position sensor Learn Procedure, then DTC P0315 00 sets.

### Conditions for Running the DTC

• | The engine is running

• | The DTC runs continuously.

### Conditions for Setting the DTC

The crankshaft position sensor system variation values are not stored in the ECM memory.

### Action Taken When the DTC Sets

DTC P0315 00 is a Type A code.

### Conditions for Clearing the DTC

DTC P0315 00 is a Type A code.

### Diagnostic Aids

This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for diagnostic tester information

### Circuit/System Testing

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 LINK.
2. If the crankshaft position 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

• | Interference in the signal circuit of the B26 Crankshaft Position (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 crankshaft position sensor system variation values and set DTC P0315 00

• | Any debris between the crankshaft position sensor and the reluctor wheel

⇒ | If the ECM is still unable to complete the learn procedure, replace the K20 Engine Control Module (ECM).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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