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If the transmission control unit senses a critical fault during driving, it will activate an emergency operating mode: Upon hydraulic failures, it will stop shifting gears and permanently retain the currently selected gear; if the failure can be pinpointed to one of the internal hydraulic control valves, the transmission will continue shifting but stop using the affected gear(s).
A transmission control unit (TCU), also known as a transmission control module (TCM), or a gearbox control unit (GCU), is a type of automotive ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely for clutch automation and actuation.
The transmission's outer clutch K2 engages at the start of the bite point, while on the alternate gear shaft the reverse gear clutch K1 is also selected. [2] [3] The clutch pack for second gear (K2) gets ready to engage. When the driver releases the brake pedal, the K2 clutch clamping force is increased, allowing the transmission to drive the ...
This transmission has a separate oil for the differential in the transmission, so there are two fluid levels to check. The differential fluid is checked by unscrewing the speed sensor gear assembly and use it as a dipstick. The speed sensor gear assembly is located on top of the transmission just above the right inner CV joint.
The Voith DIWA automatic transmission was designed by Voith primarily for city-buses and suburban buses. The transmission utilizes a Differential-Wandler (Converter) or DIWA which replaces two gears which would be used on a conventional transmission. Voith has designed many variations and generations of the Voith DIWA transmission.
In some V8 installations a small control unit activates the kick down solenoid when the brake pedal is released so that the car moves off in 1st gear. Other attributes of this transmission include a 2-3 shift delay when the engine is cold in order to speed up catalyst warm-up. 4th gear is a 1:1 ratio.
The police package (9C1) B-body cars featured a First Gear Block Out (FGBO) Plate on the transmission housing to prevent drivetrain damage. The shift point for first to second gear is about 43 MPH (69 km/h) while second to third gear shift point is about 83 MPH (134 km/h) assuming a 3.08:1 differential and a 5,500 RPM engine speed limit.
Activated by a toggle switch, Winter mode sets the gearbox to start off in 2nd gear, both in Drive and Reverse. This is designed to reduce wheelspin on icy surfaces. Also in "W" mode the transmission will shift at lower speeds. "S" mode is not sport but Sommer (German for summer) or Standard. With Jaguar XJR applications the switch is labelled ...