2010 Cadillac Truck SRX FWD V6-3.0L Page 1407
* A lean or rich Q17 fuel injector-Refer to Fuel Injector Solenoid Coil Test (LAU) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Injector/Testing and Inspection)Fuel Injector Solenoid Coil Test (LF1, LFW) (See: Powertrain Management/Fuel
Delivery and Air Induction/Fuel Injector/Testing and Inspection).
* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Spark Plug Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and
Repair)
* To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair
Verification for DTC P0420 or P0430. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0420 or P0430.
P0315
DTC P0315
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
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 System Variation Not Learned
Circuit/System Description
The crankshaft position system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the
crankshaft, and the crankshaft position sensor. 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 wider range of engine speed and load conditions.
The crankshaft position system variation compensating values are stored in ECM memory after a learn procedure has been performed and the
ignition switch is turned to the OFF position for at least 30 s. If the actual variation is not within the crankshaft position system variation
compensating values stored in the ECM, DTC P0300 may set.
If the crankshaft position system variation values are not stored in the ECM memory or a proper ECM power down does not occur after completing
the Crankshaft Position Learn Procedure, DTC P0315 sets.
Conditions for Running the DTC
DTC P0315 runs continuously.
Conditions for Setting the DTC
The ECM detects that the crankshaft position 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 (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
