Transmission Speed Sensor: Service and Repair

Output Shaft Speed (OSS) Sensor

Special Tool(s):

Material:

Removal

CAUTION: MERCON (R), MERCON (R) V, MERCON (R) SP, Motorcraft Premium Automatic Transmission Fluid and Motorcraft Continuously Variable Chain Type Transmission Fluid are not interchangeable transmission fluids. The use of any fluid other than what is recommended for this transmission will cause transmission damage.

1. With the vehicle in NEUTRAL, position it on a hoist.
2. Disconnect the battery ground cable.
3. Remove the transmission fluid pan drain plug and allow the continuously variable transaxle (CVT) transmission fluid to drain.





4. Remove the transmission fluid pan bolts and the transmission fluid pan.





5. Remove and discard the transmission fluid pan gasket.





6. NOTE: Check the transaxle case to see if the filter pickup tube seal is stuck in the case. If the pickup tube seal is in the case it will need to be removed.

Remove and discard the transmission fluid filter.
^ Use a suitable seal pick to remove the seal if it is stuck in the case.





7. CAUTION: Do not pull up on the wire harness. Damage to the wiring harness could result.

Depress the tab on the electrical connector and pull up on the output shaft speed (OSS) connector to disconnect.





8. CAUTION: The OSS sensor has a spacer under the sensor for the bolt. This is used for keeping the sensor a specific distance from the differential gears.

Remove the OSS sensor bolt, sensor and spacer.





Installation

1. CAUTION: The OSS sensor has a spacer under the sensor for the bolt. This is used for keeping the sensor a specific distance from the differential gears.

Install the OSS sensor spacer, sensor and bolt.
^ Tighten to 8 Nm (71 inch lbs.).





2. Connect the electrical connectors.





3. CAUTION: Make sure that the transmission fluid filter pickup tube seal was removed from the bore when the transmission fluid filter was removed. Failure to remove the seal prior to installing the new transmission fluid filter will result in transaxle failure.

CAUTION: Make sure that the transmission fluid filter is fully seated into the bore. If the transmission fluid filter is not correctly installed, internal transaxle damage will occur.

Install a new transmission fluid filter and seal assembly.





4. Make sure that the transmission fluid filter is seated over one of the mechatronic bolts.





5. CAUTION: Use care when cleaning the gasket surface not to scratch or gouge it, a transmission leak could result.

NOTE: Using a plastic scraper, make sure that all gasket material is removed from the case.

Install a new transmission fluid pan gasket.





6. Install the transmission fluid pan and the bolts.
Tighten in the sequence shown.
^ Tighten to 12 Nm (9 ft. lbs.).





7. Install the fluid pan drain plug.
^ Tighten to 25 Nm (18 ft. lbs.).





8. Fill the transaxle with approximately 4.7L (5 quarts) of clean CVT transmission fluid. Use the transmission fluid level setting procedure to fill the transaxle.