Automatic Transaxle/transmission - FNR5: Maintenance Ford Fusion I рестайлинг

Transmission Fluid Temperature (TFT) Sensor

The Transmission Fluid Temperature (TFT) sensor is located on the internal wiring harness to the solenoid valves in the transmission fluid pan.

It is a resistor and measures the transmission fluid temperature.

The TFT is used by the TCM for the following functions

1. applying the TCC is not permitted until the transmission fluid reaches a certain temperature.
2. engagement of 4th gear is prevented in extreme sub-zero temperatures until the normal operating temperature is reached.
3. if the transmission fluid temperature is excessive, a pre-set fixed shift curve is selected and the TCC is closed in 2, 3, 4 and 5; of the transmission warning indicator is activated. No substitute signal is available for the TFT sensor.

Scheme 470

When the ignition is switched ON, the selector lever Brake Shift Interlock Actuator (BSIA) is actuated by depressing the brake (signal from the BPP switch). This retracts the locking pin so that the selector lever can be moved out of position P.

Scheme 471

If the brake pedal should fail due to malfunction, manual unlocking is possible.

For this, the cover of the release mechanism must be removed and a suitable object (ignition key) pressed into the opening until the selector lever can be moved out of position P.

Note. If P is selected again, the selector lever is locked again.

Check Transmission Fluid Level

Note. The vehicle should not be driven if the transmission fluid level is below the bottom line on the transmission fluid level indicator and the ambient temperature is above 10°C (50°F) or damage may occur.

Note. Transmission fluid expands when warmed. To obtain an accurate transmission fluid level check, drive the vehicle until normal operating temperature is reached, approximately 32 km (20 mi).

Note. If the vehicle has been operated for an extended period at high speeds, in city traffic during hot weather or while pulling a trailer, the vehicle should be turned OFF for approximately 30 minutes to allow the transmission fluid to cool before checking.

Note. Incorrect transmission fluid level may affect the transaxle operation and could result in transaxle damage.

Under normal conditions, there is no requirement to check the transmission fluid level. However, if the transaxle is not functioning correctly (the transaxle may slip, shift slowly or there may be some sign of fluid leakage), the transmission fluid level should be checked.

1. Drive the vehicle 32 km (20 mi) or until the vehicle reaches normal operating temperature.
2. Park the vehicle on a level surface and engage the parking brake.
3. With one foot on the brake, start the engine and move the selector lever through all the gear ranges. Allow sufficient time for each gear to engage.
4. Place the selector lever in PARK and leave the engine running.
5. Remove the transmission fluid level indicator and wipe it clean with a lint free cloth.
6. Install the transmission fluid level indicator, making sure that it is fully seated in the filler tube.
7. Remove the transmission fluid level indicator. The transmission fluid should be within the designated areas.

Scheme 472

High Transmission Fluid Level

A transmission fluid level that is too high may cause the transmission fluid to become aerated due to the churning action of the rotating internal parts. This will cause erratic control pressure, foaming, loss of transmission fluid from the vent tube and possible transaxle damage. If an overfill reading is indicated, adjust the transmission fluid to the correct level.

Low Transmission Fluid Level

A low transmission fluid level could result in poor transaxle engagement, slipping or damage. This could also indicate a leak in one of the transaxle seals or gaskets.

Adding Transmission Fluid

Note. The use of any other type of transmission fluid than specified may result in transaxle damage.

If transmission fluid needs to be added, add transmission fluid in 0.25L (1/2 pt) increments through the transmission fluid filler tube. Do not overfill the transmission fluid. For transmission fluid type, refer to SPECIFICATIONS .

Check The Transmission Fluid Condition

1. Check the transmission fluid level.
2. Observe the color and the odor. The color under normal circumstances should be reddish, not brown or black.
3. Allow the transmission fluid to drip onto a facial tissue and examine the stain.
4. If evidence of solid material is found, the transmission fluid pan should be removed for further inspection.
5. If transmission fluid contamination or transaxle failure is confirmed by the sediment in the bottom of the transmission fluid pan, the transaxle must be disassembled and completely cleaned.
6. Carry out diagnostic checks and adjustments. Refer to «Diagnosis By Symptom»(ref-291885-S11416079262008073000000) .

Water in Transmission Fluid

To correctly repair an automatic transaxle that has had water or coolant introduced into the system, only install a new transaxle for the units that cannot be disassembled and cleaned. Prior to installing the transaxle, the transmission fluid cooler(s), transmission fluid cooler tubes and transmission fluid cooler hoses need to be flushed and cleaned.

Transmission Fluid Cooler

Note. Whenever the transaxle has been disassembled to install new parts, clean and backflush the transaxle fluid cooler, or damage may occur.

Note. Cleaning and backflushing the transmission fluid cooling system along with normal cleaning and inspection procedures as outlined during disassembly and reassembly will keep contamination from reentering the transaxle and causing a repeat repair.

When internal wear or damage has occurred in the transaxle, 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 transaxle troubles and must be removed from the system before the transaxle is put back in use.

Transmission Fluid Cooler - Backflushing and Cleaning

Material

Note. The use of any transmission fluid other than what is recommended for this transaxle will cause transaxle damage. Refer to the transmission fluid specification for the correct transmission fluid.

Note. Do not use water-based cleaners, mineral spirits, brake cleaner or solvents that may contain acetone, xylene or heptane to clean and/or flush the transaxle assembly, transaxle components or the torque converter, transaxle damage will occur. Use only clean transmission fluid designated for this transaxle.

1. Carry out backflushing with a suitable torque converter/fluid cooler cleaner. Test equipment to make sure that a vigorous fluid flow is present before proceeding. Install a new system filter if flow is weak or contaminated.
2. To aid in attaching the cleaner to the transmission fluid cooler tube, connect 2 additional rubber hoses to the transaxle end of the transmission fluid cooler tube as follows: Connect the cleaner tank pressure tube to the transmission fluid cooler return tube. Connect a tank return hose to the transmission fluid cooler tube. Place the outlet end of this hose in the fluid tank reservoir.
3. Turn on fluid pump and allow the fluid to circulate a minimum of 5 minutes (cycling switch on and off will help dislodge contaminants in cooler system).
4. Switch off the fluid pump and disconnect the fluid pressure hose from the transmission fluid cooler return tube.
5. Use compressed air to blow out the cooler and tubes (blow air into the transaxle cooler return tube) until all fluid is removed.
6. Remove the rubber return hose from the remaining transmission fluid cooler tube.

Transmission Fluid Drain and Refill

Material

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(ref-291849) article.
2. Disconnect the transmission fluid cooler return hose from the transaxle.
3. Insert the return hose into a calibrated 10L (10.5 qt) container.
4. Run the engine at idle and pump out 3L (3.17 qt) of transmission fluid.
5. Switch OFF the engine.
6. Remove the transmission fluid level indicator from the transmission fluid level indicator tube.
7. Add 3L (3.17 qt) of transmission fluid to the transaxle.
8. Run the engine at idle and pump out 3L (3.17 qt) of transmission fluid.
9. Switch OFF the engine.
10. Add 3L (3.17 qt) of transmission fluid to the transaxle.
11. Run the engine at idle and pump out 3L (3.17 qt) of transmission fluid.
12. Switch OFF the engine.
13. Raise the vehicle.
14. Connect the transmission fluid cooler return hose to the transaxle.
15. Add 3L (3.17 qt) of transmission fluid to the transaxle.
16. Install the transmission fluid level indicator in the transmission fluid level indicator tube.
17. Run the engine.
18. Check the transmission fluid level and fill if necessary.

Transmission Fluid Pan

Material

Scheme 473