The Eaton UltraShift transmission is a sophisticated automated manual transmission known for its durability and efficiency. However, like any complex system, it can occasionally experience issues requiring a reset. While a full reset often requires specialized diagnostic tools like ServiceRanger, understanding the Product Diagnostic Mode (PDM) can help pinpoint the root cause of many problems. This guide outlines how to utilize PDM to diagnose and potentially resolve issues, leading to a transmission reset. Note that this procedure should only be performed by a qualified technician with the appropriate tools and training.
Understanding Product Diagnostic Mode (PDM)
PDM is a diagnostic mode designed to enhance the sensitivity of the Eaton UltraShift transmission’s fault detection capabilities. It helps identify intermittent or hidden issues by stressing the system and highlighting loose connections, degraded wiring, or other potential problems. By actively monitoring the transmission in PDM, technicians can observe fault codes as they occur, leading to more accurate diagnoses. PDM essentially simulates real-world driving conditions, allowing for a thorough assessment of the transmission’s electrical and mechanical components.
Entering Product Diagnostic Mode
Before initiating PDM, ensure the vehicle is parked safely, the engine is off, and the parking brake is engaged. Connect ServiceRanger to the 9-Way Diagnostic Connector. Navigate to the “View Fault Codes” screen within the ServiceRanger software. Next, cycle the ignition key on and off twice, ending with the key in the ‘on’ position. The gear display should flash a solid “PD,” indicating that the transmission has entered Product Diagnostic Mode. You might briefly see an “88” on the dash during the key cycle, which is a normal system self-test. Remember, the vehicle will not start in PDM.
Diagnosing Issues in PDM
Once in PDM, manually manipulate the wiring harness and connectors associated with any inactive fault codes. This process helps expose loose connections or damaged wires that might be causing intermittent problems. While flexing these components, observe the ServiceRanger software for any active fault codes. If a fault code becomes active during this process, ServiceRanger will clearly display it with an “Active” status. These active codes provide valuable clues for troubleshooting. Critically, active fault codes triggered in PDM are not stored as inactive codes, differentiating them from pre-existing issues.
Exiting Product Diagnostic Mode and Next Steps
After completing the diagnostic process, turn the ignition key off to power down the system and exit PDM. If any faults were detected during PDM, refer to the appropriate troubleshooting procedures outlined in the Eaton service manual, using the identified fault code as a guide. Addressing the root cause of these faults will often resolve the issue and may negate the need for a full transmission reset. PDM compatible inactive codes include: 9, 10, 14, 16, 17, 18, 19, 22, 24, 32, 33, 34, 35, 36, 38, 39, 40, 48, 49, 50, 51, 52, 56, 58, 59, 60, 61, 63, 76, 87, 88, 89, 95, and 118.
Remember, while PDM is a valuable tool for diagnosing transmission problems, it’s crucial to consult the official Eaton service documentation for specific fault code definitions and troubleshooting procedures. A full transmission reset often requires specialized software and should only be performed by trained professionals.
