Transmission Fluid Temperature (TFT) Sensor
The transmission fluid temperature (TFT) sensor is located on the solenoid body assembly in the transmission sump. It is a temperature-sensitive device called a thermistor. The resistance value of the TFT sensor will vary with temperature change. The powertrain control module (PCM) monitors voltage across the TFT sensor to determine the temperature of the transmission fluid. The PCM uses this signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule lowers shift speeds to allow for better cold engine operation. The PCM also uses the TFT sensor input to adjust electronic pressure control (EPC) pressure for temperature effects and to inhibit torque converter clutch operation during the warm-up period.
Check Fluid Level and Condition
| CAUTION | The vehicle should not be driven if the fluid level indicator shows the fluid below the DO NOT DRIVE mark or internal failure could result. |
Note. If the vehicle has been operated for an extended period of time at highway speeds, in city traffic, in hot weather, or while pulling a trailer, the fluid needs to cool down to obtain an accurate reading.
Note. The fluid level reading on the indicator will differ depending on operating and ambient temperatures. The correct reading should be within the normal operating temperature range.
Under normal circumstances, the fluid level should be checked during regular maintenance. If the transmission starts to slip, shift slowly, or show signs of leaking, the fluid level should be checked.
Scheme 301
- With the transmission in (P) PARK, the engine at idle, foot pressed on the brake, move the range selector lever through each gear and allow engagement of each gear. Place the range selector lever in the (P) PARK position.
- Wipe the fluid level indicator cap and remove the indicator.
- Wipe the indicator with a clean cloth.
- Install the indicator back in the filler tube until it is fully seated, then remove the indicator. The fluid level should be within the normal operating temperature range.
High Fluid Level
A fluid level that is too high may cause the fluid to become aerated due to the churning action of the rotating internal parts. This will cause erratic control pressure, foaming, loss of fluid from the vent tube and possible transmission malfunction and or damage. If an overfill reading is indicated refer to TRANSMISSION FLUID DRAIN AND REFILL .
Low Fluid Level
A fluid level that is too low may cause the fluid to become aerated due to the churning action of the rotating internal parts.
A low fluid level could also result in poor transmission engagement, slipping, malfunction and/or damage. This could indicate a leak in one of the transmission seals or gaskets.
Adding Fluid
| CAUTION | The use of any other type of transmission fluid than specified could result in transmission malfunction and/or damage. |
If fluid needs to be added, add fluid in 0.25L (1/2 pint) increments through the filler tube. Do not overfill the fluid. For fluid type, refer to the Fluid Capacity chart in GENERAL SPECIFICATIONS .
Fluid Condition Check
- Check the fluid level.
- Observe the color and the odor. The color under normal circumstances should be dark reddish, not brown, pink or black, or have a burnt odor.
- Hold the fluid level indicator over a white facial tissue and allow the fluid to drop onto the facial tissue and examine the stain.
- If evidence of solid material is found, the transmission fluid pan should be removed for further inspection.
- If the stain is a foamy pink color this may indicate coolant or water in the transmission. The engine cooling system should also be inspected at this time.
- If fluid contamination or transmission failure is confirmed by the sediment in the bottom of the fluid pan, the transmission must be disassembled and completely cleaned. This includes the torque converter, coolers, cooler lines and cooler bypass valve.
- Carry out diagnostic checks and adjustments; refer to «DIAGNOSIS BY SYMPTOM»(ref-210155-S07423603722005121300000) .
Transmission Fluid Cooler
| CAUTION | Prior to this test, the in-line service filter (if equipped) will need to be removed. Failure to remove the in-line filter may result in an incorrect reading/diagnosis during this test. |
| CAUTION | Whenever a transmission has been disassembled to replace worn or damaged parts, the cooler bypass valve (CBV), all transmission fluid coolers (in tank and auxiliary), and transmission fluid cooler lines must be cleaned and backflushed. |
Note. Cleaning and backflushing the transmission fluid cooling system, along with following all the normal cleaning and inspection procedures during disassembly and reassembly, will keep contamination from entering the transmission and causing a repeat repair.
When internal wear or damage has occurred in the transmission, metal particles, clutch plate material, or band material may have been carried into the torque converter and transmission fluid cooler. These contaminants are a major cause of recurring transmission troubles and must be removed from the system before the transmission is put back into use.
TRANSMISSION FLUID COOLER - BACKFLUSHING AND CLEANING
- Using a suitable torque converter/fluid cooler cleaner, flush the fluid cooler and lines.
- Connect the cleaner pressure and return lines appropriately. Connect the pressure line to fluid cooler inlet tube. Connect the return line to fluid cooler outlet tube. Place the outlet end of the return line in the solvent tank reservoir.
- Switch the solvent pumps on. Allow the solvent to circulate a minimum of 5 minutes.
- Switch the solvent pump off.
- Disconnect the cleaner pressure line at the fluid cooler tube.
- Using compressed air, blow through the fluid cooler inlet tube until all solvent is removed.
- Remove the rubber hoses from fluid cooler tubes.
TRANSMISSION FLUID IN-LINE FILTER
MATERIAL
| Item | Specification |
|---|---|
| Mercon Multi-Purpose (ATF) Transmission Fluid XT-2-QDX | MERCON® |
MATERIAL SPECIFICATION
Note. Use the following guidelines for installing the transmission fluid in-line filter
- If the transmission was overhauled and the vehicle was equipped with an in-line fluid filter, install a new in-line fluid filter.
- If the transmission was overhauled and the vehicle was not equipped with an in-line fluid filter, install a new in-line fluid filter kit.
- If the transmission is being installed for a non-internal repair, do not install an in-line filter or filter kit.
- If installing a Ford-authorized remanufactured transmission, install the in-line transmission fluid filter that is supplied.
Scheme 302
Scheme 303
- With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING & LIFTING»(ref-210109) .
- Remove the section of the rubber hose as illustrated.
- Install the filter and tighten the clamps.
- Clean a section of the transmission fluid pan and install the sticker.
- Fill the transmission with clean automatic transmission fluid. Verify for correct operation. Check the filter for leaks.
TRANSMISSION FLUID DRAIN AND REFILL
SPECIAL TOOL(S)
Scheme 304
MATERIAL
| Item | Specification |
|---|---|
| Motorcraft MERCON® Multi-Purpose (ATF) Transmission Fluid XT-2-QDX | MERCON® |
MATERIAL SPECIFICATION
- A new procedure for draining and adding transmission fluid, using a suitable transmission flush and fill machine, has been added. The following is a list of different methods for draining and refilling the transmission fluid: All vehicles using a suitable flush and fill machine. Vehicles equipped with a fluid pan and torque converter drain plug. Vehicles not equipped with a fluid pan or a torque converter drain plug. Vehicles equipped with a torque converter drain plug and without a fluid pan drain plug. Use the method that is applicable to your vehicle.
All Vehicles Using A Suitable Flush And Fill Machine
DRAINING
Pinpoint Test H
- REFILL