Some 2009-2011 Ford Edge, MKX, Taurus, Flex, MKS and 2010-2011 MKT vehicles equipped with a 6F50 or 6F55 transmission may intermittently exhibit slipping/neutral out, 5th gear start from stop, electronic PRNDL error, backup camera on in Drive or speed control dropping out intermittently. This may be due to high resistance in the transmission range sensor (TR).
- Check the TR sensor circuit resistance. With the brakes applied, engine off and key on, move the shifter into the low gear (L or M) position.
- Turn the key off.
- Disconnect connector C168 from the transmission.
- Measure the resistance between the transmission connector pins:
- 8 and 4
- 8 and 5
- 8 and 6
- 8 and 7
- The top row of the transmission’s pins are numbered 1-10 from left to right.
- If any of the four measurements are above 5 ohms, proceed to Step 5.
- If all measurements are within specification, this procedure does not apply.
- The workshop manual states to remove the retaining pin that holds the TR sensor in the transmission case. A small 6-inch rolling head pry bar is effective in removing the pin.
- The workshop manual goes into detail on making sure that the park pawl actuator rod does not become disengaged from the park pawl and the abutment by keeping the end of the park pawl actuator rod behind the machined valve body mating surface of the transaxle case, while removing the park pawl actuator rod from the TR sensor and reinstalling it back into the TR sensor. If the park pawl actuator rod becomes disengaged from the park pawl and the abutment, tranaxle removal and disassembly is then required to reinstall the actuator rod.
- Replace the TR sensor. Refer to workshop manual section 307-01. The last three steps of the workshop manual section 307-01 are very important in order to prevent damage or unnecessary work.
Check resistance between pin 8 and 4, 8 and 5, 8 and 6 and 8 and 7.
When replacing the TR sensor, be careful not to disengage the park pawl actuator rod from the park pawl.