Automatic Transmission: Maintenance Ford Mustang IV рестайлинг

Transmission Fluid Temperature (TFT) Sensor

The transmission fluid temperature (TFT) sensor is located on the lead frame assembly near the shift solenoids on the main control valve body. It is a temperature-sensitive device called a thermistor. It sends a voltage signal to the PCM. The voltage signal varies with transmission fluid temperature. The PCM uses this signal to determine whether a cold start shift schedule is necessary. The shift schedule is compensated when the transmission fluid temperature is cold. The PCM also inhibits (TCC) operation at low transmission fluid temperatures and corrects electronic pressure control.

Fluid Level Check

Note. If the vehicle has been operated for an extended period, at high highway speeds, in city traffic, during 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 from 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 normal maintenance. If the transmission starts to slip, shifts slowly, or shows signs of fluid leaking, the fluid level should be checked.

Scheme 136

1. 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 transmission range selector lever in the P position.
2. Wipe the fluid level indicator cap and remove the indicator.
3. Wipe the indicator with a clean cloth.
4. 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 failure. If an overfill reading is indicated, drain and refill the transmission.

Low Fluid Level

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

Adding Fluid

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 GENERAL SPECIFICATIONS .

Fluid Condition Check

1. Check the fluid level.
2. Observe the color and the odor. The color under normal circumstances should be dark reddish, not brown or black or have a burnt odor.
3. Hold the fluid level indicator over a white facial tissue and allow the fluid to drip onto the 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 the stain is a foamy pink color this may indicate coolant in the transmission. The engine cooling system should also be inspected at this time.
6. 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 and cooler tubes. The oil-to-air cooler will need to be installed.
7. Carry out diagnostic checks and adjustments. Refer to «DIAGNOSIS BY SYMPTOM»(ref-220641-S21923789592006021700000) .

TRANSMISSION FLUID COOLER

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 reentering 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 IN-LINE FILTER

Material

MATERIAL SPECIFICATION

Note. Use the following guidelines for installing the transmission fluid in-line filter

1. If the transmission was overhauled and the vehicle was equipped with an in-line fluid filter, install a new in-line fluid filter.
2. 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.
3. If the transmission is being installed for a non-internal repair, do not install an in-line filter or filter kit.
4. If installing a new or a Ford-authorized remanufactured transmission, install the in-line transmission fluid filter that is supplied.

Scheme 137

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Scheme 144

1. Remove the retainer clip from the cooler tubes.
2. If equipped, remove the nuts and position the degas bottle aside.
3. Disconnect the upper transmission cooler tube fitting.
4. Cut a section of the return tube as illustrated.
5. Clean and de-burr the cut ends of the steel tubing.
6. Install the tubing ferrule hose assembly connectors onto each end of the cut steel fluid cooler tube. Finger-tighten the ferrule nut, then tighten the nut an additional 1-1/2 turns to seat the ferrule in the connector.
7. Install the filter in the correct direction using two suitable lengths of hose. Tighten the hose clamps.
8. Connect the upper transmission cooler tube fitting.
9. If equipped, reposition the degas bottle and install the nuts.
10. Install the retainer clip to the cooler tubes.
11. With the vehicle in NEUTRAL, position it on a hoist.
12. Clean a visible section of the transmission fluid pan and install the sticker indicating that the vehicle is equipped with an in-line filter.
13. Fill the transmission with clean automatic transmission fluid. Verify for correct operation. Check the filter for leaks.

Scheme 145

Draining

Note. Draining fluid from the transmission by removing only the fluid pan is acceptable for vehicles that do not have a torque converter drain plug, for normal or severe duty fluid maintenance.

Note. A new procedure for draining and adding transmission fluid using a suitable transmission flush and fill machine has been added. The following procedure has different methods for draining and refilling the listed vehicles

1. All vehicles using a suitable flush and fill machine.
2. Vehicles equipped with a torque converter drain plug.
3. Vehicles without a torque converter drain plug.

Use the method that is applicable to your vehicle.

All Vehicles Using A Suitable Flush And Fill Machine

Draining - Vehicles Equipped With A Torque Converter Drain Plug

Draining - Vehicles without a torque converter drain plug