A recent test highlighted a potential issue with 4L60e scan tools and their reporting of 3-2 solenoid operation. The test involved physically swapping the 1-2 and 2-3 shift solenoid connectors at the transmission valve body and then observing the scan tool’s readings. Surprisingly, the scanner’s on/off status for each solenoid remained unchanged after the swap.
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This result contradicts expected behavior. If the connectors are swapped, the scan tool should display the reverse on/off status for Shift Solenoids 1-2/3-4 in both 2nd and 4th gear. The unchanging readings indicate a discrepancy between the actual solenoid operation and the data reported by the scan tool. This issue affects not only the scanner’s readings but also the accuracy of the Controls and Special Functions within the tuning software.
The handwritten scan test results compared the expected solenoid operation (from the GM Service Manual) with the actual scan results before and after swapping the connectors. The data clearly demonstrated the inconsistency, confirming the scan tool’s inaccurate reporting. This suggests a potential flaw in the software interpreting and displaying the solenoid data.
This issue raises concerns about the reliability of diagnostic procedures that rely on accurate solenoid readings. Incorrect information could lead to misdiagnosis and unnecessary repairs. Given the widespread use of 4L60e transmissions and related scan tools, addressing this discrepancy is crucial. A prompt software update is necessary to ensure accurate solenoid data reporting, enabling technicians to correctly diagnose and address transmission issues.
Further investigation and communication with the scan tool software developers are essential to resolving this problem and ensuring the accuracy of future diagnostic procedures. This highlights the importance of ongoing validation and updates for diagnostic software to maintain its reliability and effectiveness in real-world applications. Accurate diagnostic tools are essential for proper vehicle maintenance and repair, contributing to overall vehicle safety and performance.
