Contents Wiring diagrams Section: Automatic Trans All sections

Automatic Transmission: Overview Acura TL IV facelift

Automatic Trans 2 illustrations ~322 words

Scheme 20

Scheme 20: Special Tools

Scheme 21

Scheme 21

General Description

The automatic transmission is a transverse-mounted five-shaft design with an electronically controlled hydraulic circuit that provides six forward speeds and one in reverse. Engine output is transmitted through the torque converter, a combination of shafts which hold gears and clutches and a differential that transmits power to the driving wheels. SH-AWD equipped model also has a transfer assembly which transmits power to the SH-AWD differential.

Gear operation

Gears on the mainshaft

  1. 3rd gear is engaged/disengaged with the mainshaft by the 3rd clutch.
  2. 6th gear is engaged/disengaged with the mainshaft by the 6th clutch.
  3. 4th gear is splined with the mainshaft and rotates with the mainshaft.

Gears on the secondary shaft

  1. 1st gear is engaged/disengaged with the secondary shaft by the 1st clutch.
  2. 2nd gear is engaged/disengaged with the secondary shaft by the 2nd clutch.
  3. 5th gear is engaged/disengaged with the secondary shaft by the 5th clutch.
  4. Idler gear is splined with the secondary shaft, and rotates with the secondary shaft.

Gears on the third shaft

  1. 4th gear is engaged/disengaged with the third shaft by the 4th clutch.
  2. Reverse selector hub is splined with the third shaft and rotates with the third shaft.
  3. Reverse selector on the reverse selector hub switches between the reverse gear and 6th gear.

Gears on the countershaft

  1. Final drive gear is integral with the countershaft.
  2. 2nd gear, 5th gear, and park gear are splined with the countershaft, and rotate with the countershaft.
  3. 1st gear is engaged with the park gear splined with the countershaft by the one-way clutch when accelerating. It is disengaged from the park gear by the one-way clutch when decelerating.

Gears on the idler gear shaft

  1. Idler gear is press-fitted with the idler gear shaft, and rotates with the idler gear shaft.
  2. Idler gear is engaged with the mainshaft 4th gear and the secondary shaft idler gear, and transmits the mainshaft rotation to the secondary shaft.