Automatic Transmission/transaxle: Maintenance Jaguar S-type I рестайлинг

Fluid Pump

The fluid pump is of a "half-moon" pattern and delivers approximately 16 square cm of transmission fluid per revolution.

It is located between the torque converter and the transmission housing.

The torque converter is supported in the fluid pump by a needle roller bearing. The fluid pump is driven directly from the engine by the torque converter shell and supplies transmission fluid to the transmission and the hydraulic control unit.

The fluid pump draws in transmission fluid through a filter and delivers it at high pressure to the main pressure valve in TCM and main control valve body unit. This valve adjusts the pressure and returns excess transmission fluid to the fluid pan.

Scheme 45

Fluid Pan, Gasket and Filter

The transmission fluid pan, gasket and filter is a one piece assembly, all transmission fluid is drawn from the transmission fluid pan by the fluid pump and passes through the fluid filter.

Transmission Fluid Temperature (TFT) Sensor

The TCM utilizes one transmission fluid temperature sensor located on the main control valve body. The TCM uses the sensor input to activate various shift strategies. The sensor is in the form of a temperature dependent resistor.

The temperature sensor performs plausibility checks on each sensor reading. Obviously, the transmission oil temperature should not jump in value excessively between sensor readings. If the inputs from the temperature sensor are outside the working range it possible that the sensor is short or open circuit.

Transmission Fluid Temperature Sensor Monitoring

The TCM monitors for faults associated with the transmission fluid temperature sensor in the following ways

1. Open and short circuit fault detection.
2. The temperature cannot alter by more than a predefined differential between any two consecutive measurements.
3. The transmission fluid temperature must rise after the engine has been started provided that the fluid temperature was low enough to begin with (The vehicle must be driven and the diagnostic test condition met).

Check Fluid Level and Condition

Note. The transmission oil temperature must not be allowed to exceed 50°C (122°F) while checking level. Should the temperature rise above this figure, abort the check and allow the transmission oil to cool to below 30°C (86°F).

This vehicle is not equipped with a fluid level indicator. An incorrect level may affect the transmission operation and could result in transmission damage. To correctly check and add fluid to the transmission, refer to Transmission Fluid Level Check - General Procedures .

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 damage. If an overfill reading is indicated, refer to Transmission Fluid Drain and Refill - General Procedures .

Low Fluid Level

A low fluid level could result in poor transmission engagement, slipping, or damage. This could also indicate a leak in one of the transmission seals or gaskets. Refer to Transmission Fluid Level Check - General Procedures .

Adding Fluid

If fluid needs to be added, add fluid in 0.50 liter increments through the fill hole opening. Do not overfill the fluid. For fluid type, refer to the General Specifications . Refer to Transmission Fluid Level Check - General Procedures .

Fluid Condition Check

1. Check the fluid level. For additional information, refer to «Transmission Fluid Level Check - General Procedures»(ref-311290-S23095508792009032500000) .
2. Observe the color and the odor. The color under normal circumstances should be reddish, not brown or black.
3. Allow the 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.

Note. In the event of a transmission unit replacement for internal failure, the oil cooler and pipes must also be replaced.

Note. The transmission oil temperature must not be allowed to exceed 50°C (122°F) while checking level. Should the temperature rise above this figure, abort the check and allow the transmission oil to cool to below 30°C (86°F).

This vehicle is not equipped with a fluid level indicator. An incorrect level may affect the transmission operation and could result in transmission damage. To correctly check and add fluid to the transmission follow the procedures outlined in Transmission Fluid Level Check - General Procedures and Transmission Fluid Drain and Refill - General Procedures .

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 damage. If an overfill reading is indicated, refer to Transmission Fluid Drain and Refill - General Procedures .

A low fluid level could result in poor transmission engagement, slipping, or damage. This could also indicate a leak in one of the transmission seals or gaskets. To correctly check and add fluid to the transmission follow the procedures outlined in Transmission Fluid Level Check - General Procedures and Transmission Fluid Drain and Refill - General Procedures .

If fluid needs to be added, add fluid in 0.50 liter increments through the fill hole opening. Do not overfill the fluid. For fluid type, refer to General Specifications .

1. Check the fluid level. For additional information, refer to «Transmission Fluid Level Check - General Procedures»(ref-311290-S23095508792009032500000) .
2. Observe the color and the odor. The color under normal circumstances should be like honey, not dark brown or black.
3. Allow the 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.

NOTE: In the event of a transmission unit replacement for internal failure, the oil cooler and pipes must also be replaced.

Transmission Fluid Drain and Refill - General Procedures

Special Tools Tool Illustration Tool Name Tool Number Adaptor 307-452

Transmission Fluid Level Check - General Procedures

Special Tools Tool Illustration Tool Name Tool Number Adaptor 307-452