Ford/Mercury transmission glitch
Some 2009-2010 Ford/Mercury Escape, Mariner, 2010 Fusion and Milan vehicles equipped with the 6F35 automatic transmission and built on or before 11/25/2009 may exhibit DTCs P0720 or P0722 (harsh engagement or shifts or starts in 5th gear from a stop). These conditions may be caused by an open circuit in the output shaft speed (OSS) sensor or the main control lead frame connector.
1. Check the condition of the transmission fluid. If the fluid does not smell burnt, continue to Step 2 and follow the repair procedure to diagnose the OSS circuit. If the fluid does smell burnt, follow normal Work Shop Manual diagnosis to repair.
2. Follow Work Shop Manual Section 307-01A or Escape and Mariner or 307-01B for Fusion and Milan. Perform pin point test (PPT) steps C through C7. If instructed to replace the OSS sensor in PPT step C7, proceed to Step 3. If the PPT does not lead to replacing the OSS, this procedure does not apply and proceed with normal diagnostics.
3. Check the build date on the lead frame. The lead frame build date is a Julian date. The first two numbers are the year (09) and the next three numbers are the day of the year. If the build date is one of the following, replace the lead frame and the OSS sensor:
BUILD DATE LEAD FRAME PARTS NOT TO BE USED
4. When replacing the lead frame, inspect the build date on the new part. Do not use a build date listed above. If the lead frame build date does not match one listed above, only replace the OSS sensor.
PART NUMBER PART
9L8Z-7H103-A OSS sensor
9L8Z-7G276-A Lead frame