What Is CKP variation learn?
What Is CKP variation learn?
The Crankshaft Position Variation Learn Procedure — concerning the relationship of the Crankshaft Position sensor or CKP to the crankshaft reluctor — was introduced in 1997 and has been used more broadly since 1998.
How do crankshaft sensors work?
How the crankshaft position sensor works. The crankshaft position sensor is positioned so that teeth on the reluctor ring attached to the crankshaft pass close to the sensor tip. As the crankshaft rotates, the sensor produces a pulsed voltage signal, where each pulse corresponds to the tooth on the reluctor ring.
When to run the crankshaft position variation variation learn procedure?
Important: Reprogramming the PCM does not require running the Crankshaft Position System Variation Learn Procedure unless the PCM is new or from another vehicle. A DTC P1336 sets if the Crankshaft Position System Variation is not within an acceptable range, or can not be learned. Conclusion
How to relearn GM crankshaft position sensor variation guide?
IMPORTANT: After the ignition switch is turned to the CRANK position, the VCM must see a change in the state of brake switch (released to applied) to run the learn procedure. Also, the service brakes, and the parking brake must be held throughout the duration of the learn procedure. 4) Gradually accelerate engine to required RPM.
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 does ” crank relearn ” mean on a GM engine?
“Crank relearn” refers to a GM service procedure that has to do with the calibration of the PCM to a specific engine’s crankshaft position sensor (CKP sensor). When your Gen III (LS1, etc) or Gen IV (LS2, etc) based car or truck was put together and factory-tested, one of the procedures it went through was the “crank learn” procedure.
How to relearn the crank position variation variation?
Set the parking brake and block the drive wheels. Make sure that the hood is closed. 2. Start the engine and make sure that the engine coolant temperature is at least 158 degrees F. (70 degrees C.) 3. Turn the engine off for at least 10 seconds. 4. Select the crankshaft position variation learn procedure (CASE Learn)on your scanner.
How to do the crank relearn procedure 4.1?
Install a scan tool. Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set. Select the crankshaft position (CKP) variation learn procedure with a scan tool. The scan tool instructs you to perform the following: 4.1.
IMPORTANT: After the ignition switch is turned to the CRANK position, the VCM must see a change in the state of brake switch (released to applied) to run the learn procedure. Also, the service brakes, and the parking brake must be held throughout the duration of the learn procedure. 4) Gradually accelerate engine to required RPM.
How to enable the CKP system variation learn procedure?
Enable the CKP system variation learn procedure with a scan tool. IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete. Accelerate to WOT.
