When do I need to relearn GM crankshaft variation?
When do I need to relearn GM crankshaft variation?
GM Crankshaft Variation Relearn All 1996 and newer GM vehicles with FLASH reprogramming ECCs. Crankshaft Variation Relearn Procedure must be performed if: • ECC was reprogrammed. • Crankshaft position sensor has been replaced. • ECC has been replaced. Follow the relearn procedure outlined below: 1.
How is the variation in crankshaft position measured?
The PCM measures the variation between crankshaft position reference points. These measurements are compared to an ideal reference stored in the PCM. If the variation exceeds a calibrated percentage, a fault code is stored.
How to do a crank Relearn on a computer?
To perform the relearn, proceed as follows: Connect a scanner to make sure there are no trouble codes stored in the computer’s memory. If there is any power train trouble code other than P1336 (Crankshaft Position Variation not learned), the computer will disable the relearn function until the problem that caused the code has been eliminated.
What is the p0315 crankshaft position system variation not learned?
If it does not, then the problem was intermittent or the P0315 was a memory code, that is it was something in the past. If the code resets, that is comes right back the next time you start or try to start the engine, or the very next road test further inspection is required. Locate the Crankshaft Position Sensor on your particular vehicle.
When to do a crankshaft variation relearn?
Crankshaft Variation Relearn Procedure must be performed if: • ECC was reprogrammed. • Crankshaft position sensor has been replaced. • ECC has been replaced. Follow the relearn procedure outlined below: 1. Install scan tool on Data Link Connector (DLC) located under the dash. Apply parking brake and block wheels. Insure hood is closed. 2.
To perform the relearn, proceed as follows: Connect a scanner to make sure there are no trouble codes stored in the computer’s memory. If there is any power train trouble code other than P1336 (Crankshaft Position Variation not learned), the computer will disable the relearn function until the problem that caused the code has been eliminated.
If it does not, then the problem was intermittent or the P0315 was a memory code, that is it was something in the past. If the code resets, that is comes right back the next time you start or try to start the engine, or the very next road test further inspection is required. Locate the Crankshaft Position Sensor on your particular vehicle.
What causes a crankshaft position to not be learned?
Crankshaft position re-learn procedure not performed / improperly performed – one of the more common causes Worn timing components, to include the timing chain and timing gears, distributor or even the flex plate (the part that the starter uses to crank the engine over with) – next most common, along with:
