2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2107
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides 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, 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.
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
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
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 (See: Powertrain
Management/Computers and Control Systems/Crankshaft Position Sensor/Testing and Inspection).
2. 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 (See: Engine, Cooling and Exhaust/Engine/Service and
Repair/Overhaul/35. 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
瀚慖f the ECM is still unable to complete the learn procedure, replace the ECM.
