Encountering the OBD-II error code P1336 can be a frustrating experience for any car owner or mechanic. This code, often related to the crankshaft position sensor, signals potential issues within your vehicle’s engine management system. Specifically, P1336 indicates a problem with the Crankshaft Angle Sensor Error (CASE) learn procedure not being completed or correctly performed. Understanding this error and how to address it is crucial for maintaining your vehicle’s performance and preventing further complications.
What is the P1336 Error Code?
The P1336 error code is a diagnostic trouble code (DTC) that, according to the original article, points towards an issue with the CASE relearn process. This process is essential after replacing the Powertrain Control Module (PCM) or the crankshaft position sensor itself. The PCM needs to “learn” the minute variations in the crankshaft position sensor signal to accurately monitor engine speed and timing. If this relearn procedure is not successfully completed, or if there are underlying problems, the P1336 code can be triggered.
CASE Relearn and its Importance
The Crankshaft Angle Sensor Error (CASE) relearn is a calibration procedure that synchronizes the crankshaft position sensor signal with the PCM. This synchronization is vital for accurate fuel delivery, ignition timing, and overall engine management. When components like the PCM or crankshaft sensor are replaced, the factory-learned parameters are lost, necessitating a relearn. Without a proper CASE relearn, the engine might experience performance issues, rough idling, or even fail to start.
Diagnosing and Resolving P1336 with OBD-II Tools
Fortunately, with the right tools, diagnosing and addressing the P1336 error becomes manageable. Tools like the Tunerpro ADX script, when used with a USB AVT OBD-II cable, can significantly simplify the CASE relearn process and provide valuable feedback.
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Alt text: TunerPro ADX dashboard displaying key indicators for CASE relearn process, including “Learn Active” and “CKP Request OK’d” statuses.
This script offers a user-friendly interface to monitor the relearn process in real-time. Key indicators on the dashboard include:
- Learn Active: This indicator turns blue and displays “Yes” when the CASE relearn procedure is actively engaged. This confirms that the relearn process has been initiated.
- CKP Request OK’d: A “Yes” here is crucial. It signifies that the PCM has accepted the CASE relearn request. A “No” indicates that the PCM has rejected the request, possibly due to invalid parameters for your vehicle’s model year or the presence of other Diagnostic Trouble Codes (DTCs). This indicator should ideally remain “Yes” throughout the relearn process. If it switches to “No” after being “Yes,” it might signal the completion of the relearn, with the PCM now rejecting further attempts.
Understanding Status Flags and Potential Issues
For vehicles with pre-2000 model year PCMs, the script may also display helpful status flags:
- Cool temp too Low: Indicates that the engine has not reached the required operating temperature for the CASE relearn to be performed.
- Too many attempts: This flag suggests that the CASE relearn procedure has been attempted too many times without success, potentially pointing to an underlying issue.
The “Errors Detected” flag is particularly relevant to the P1336 error. If this flag is set after a relearn attempt, it indicates the presence of a P1336 code. However, interestingly, the original article notes that this flag “does not seem to cause the PCM not to pair to the sensor.” Other error flags, if triggered, could point to more serious issues with the crank encoder or the cam and crank sensors themselves, requiring further investigation.
Conclusion
The OBD-II error code P1336 is a clear signal that your vehicle’s CASE relearn process might have failed or encountered issues. Utilizing OBD-II diagnostic tools and scripts like Tunerpro ADX can greatly aid in diagnosing and resolving this problem. By monitoring key indicators and understanding potential status flags, mechanics and car enthusiasts can effectively troubleshoot P1336 errors, ensuring optimal engine performance and avoiding potential drivability problems related to crankshaft position sensor calibration. For advanced diagnostics and comprehensive automotive solutions, consider exploring professional-grade tools available at Autel France.
