P0315 CHEVROLET - Crankshaft Position System Variation Not Learned

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

Possible causes

  • Crankshaft position (CKP) system variation learning
  • Faulty Crankshaft Position (CKP)
  • Crankshaft Position (CKP) sensor harness is open or shorted
  • Crankshaft Position (CKP) sensor circuit poor electrical connection

Tech notes

The crankshaft position (CKP) system variation learn procedure is done better with an scan tool, but if the Crankshaft Variation Relearn is not accessible through your scan tool (some truck applications 1998 & later), perform the relearn in the following manner:

1. Turn off all of the accessories. With the Air temperature sensor and Coolant temperature within 5 degrees (Centigrade) of each other, start the engine and let it idle in Park or Neutral for two minutes.
2. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for 8- 10 minutes until the engine reaches operating temperature.
3. Cruise at 55 mph for another 5-6 minutes.
4. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute.
5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary. Returning to 45 mph for 15 seconds in between deceleration cycles.
6. Accelerate to 55 mph and cruise for 2 minutes.
7. Stop the vehicle and idle for 2 minutes with the brake applied and the transmission in Drive (automatic trans.) or Neutral (manual trans.) with the clutch depressed.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine fails to start
  • Engine runs rough

P0315 Chevrolet Description

The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the CKP 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.

The CKP 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 seconds . If the actual CKP variation is not within the CKP system variation compensating values stored in the ECM, 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.

OBDII Code P0315 Chevrolet - Crankshaft Position System Variation Not Learned - Engine-Codes.com
Repair Importance Level: 3
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 3
 
1=Easy 2=Moderate 3=Hard  
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