Automatic Transmission: Specifications Acura TL IV facelift

Torque Converter

The torque converter is connected to the flywheel. It consists of an impeller (pump), turbine, stator, and torque converter clutch piston, which uses ATF to transmit engine power to the input shaft (mainshaft). Around the outside of the torque converter housing, the starter ring gear is installed, which is used to start the engine.

Lock-Up Mechanism

The lock-up causes the input shaft (mainshaft) to rotate at the same speed as the engine crankshaft by engaging the torque converter cover with the turbine by the torque converter clutch. Together with the hydraulic control, the PCM optimizes the timing and degree of lock-up. The lock-up mechanism operates in D (during accelerating: 1st, 2nd, 3rd, 4th, 5th, and 6th gears/during decelerating: 2nd, 3rd, 4th, 5th, and 6th gears), S with automatic shift mode (during accelerating: 1st, 2nd, 3rd, 4th, and 5th gears/during decelerating: 2nd, 3rd, 4th, and 5th gears), and S with sequential sportshift mode (during accelerating: 1st, 2nd, 3rd, 4th, 5th, and 6th gears/during decelerating: 2nd, 3rd, 4th, 5th, and 6th gears). The torque converter clutch is in the torque converter. The multi-plate torque converter clutch increases the torque capacity and extends the lock-up area, improving fuel economy.

Torque Converter Clutch Lock-Up ON (Engaging Torque Converter Clutch)

The fluid pressure is applied to the lock-up fluid passage (94) in the torque converter, causing the torque converter clutch in the torque converter to be engaged and then the turbine and the torque converter cover to be engaged. The mainshaft rotates at the same speed as the engine crankshaft when the torque converter clutch in the torque converter is engaged.

Scheme 1

Torque Converter Clutch Lock-Up OFF (Disengaging Torque Converter Clutch)

When the fluid pressure to the lock-up fluid passage (94) in the torque converter is blocked, the torque converter clutch in the torque converter is released. The turbine and the torque converter cover are also released at this time, causing the mainshaft and the engine crankshaft to rotate at a different speed.

Scheme 2

Total Starting Torque Measurement

Note. To prevent damage to the transfer housing, always use wood blocks or equivalent materials between the transfer housing and a bench vice.

Scheme 3

1. Remove the transfer assembly (see «TRANSFER ASSEMBLY REMOVAL»(ref-512340-S38039537392012103100000) ).
2. Secure the transfer housing (A) in a bench vise (B) with wood blocks.
3. Rotate the companion flange several turns to seat the tapered roller bearings.
4. Measure the total starting torque at the companion flange (C) with a torque wrench (D) and a socket (E). Standard: 2.64 - 4.23 N.m (26.9 - 43.1 kgf.cm, 23.3 - 37.4 lbf.in)
5. If the total starting torque is out of the standard, replace the transfer assembly.

Fluid Leak Check

1. Check for fluid leaks between the mating faces of the transfer assembly and the transmission.
2. If there is leak, remove the transfer cover, then replace the transfer cover oil seal and the O-ring (see «TRANSFER COVER OIL SEAL REPLACEMENT»(ref-512340-S36789083032012103100000) ).
3. Check for fluid leaks between the transfer companion flange and the transfer oil seal.
4. If there is leak, replace the transfer oil seal and the O-ring (see «TRANSFER COVER OIL SEAL REPLACEMENT»(ref-512340-S36789083032012103100000) ). Do not replace the oil seal with the transfer assembly on the transmission.

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

1. Raise the vehicle on a lift, and make sure it is supported securely.
2. Shift the transmission into N.
3. Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(ref-512366-S30338645452012103100000) ).
4. Remove the drain plug (A), and drain the automatic transmission fluid (ATF).
5. Reinstall the drain plug with a new sealing washer (B).
6. Remove the front subframe stiffener.
7. Remove exhaust pipe A (see «J37A4 ENGINE (WITH SH-AWD)»(ref-512343-S17952248552012103100000) ).
8. Remove the bolt securing the transfer breather hose bracket (A), and disconnect the breather hose (B) from the breather pipe (C) on the transfer assembly.
9. Make reference marks (A) across the No. 1 propeller shaft (B) and the transfer companion flange (C).
10. Separate the No. 1 propeller shaft from the transfer companion flange.
11. Remove the transfer assembly from the transmission.

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. Clean the areas where the transfer assembly contacts the transmission with solvent, and dry with compressed air. Then apply ATF to the contact area.
2. Install the dowel pin (A) in the transmission, and install the transfer assembly (B) on the transmission.
3. Install the No. 1 propeller shaft (A) to the transfer companion flange (B) by aligning the reference marks (C). Make sure you use new mounting bolts.
4. Install the transfer breather hose bracket (A) on the transfer assembly, and connect the breather hose (B) over the breather pipe (C) with facing the dot mark (D) to the rear side of the vehicle.
5. Install exhaust pipe A (see «J37A4 ENGINE (WITH SH-AWD)»(ref-512343-S17952248552012103100000) ).
6. Install the front subframe stiffener with new mounting bolts.
7. Refill the transfer assembly with transfer fluid (hypoid gear oil), if necessary (see «TRANSFER ASSEMBLY FLUID REPLACEMENT»(ref-512340-S03633109972012103100000) ).
8. Refill the transmission with ATF (see «ATF REPLACEMENT»(ref-512340-S28789068052012103100000) ).
9. Install the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(ref-512366-S30338645452012103100000) ).

Scheme 13

Special Tools Required

Flange Holder 07XAB-0010101

Note. To prevent damage to the transfer housing, always use wood blocks or equivalent materials between the transfer housing and a bench vise.

Scheme 14

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Scheme 17

Scheme 18

Scheme 19

1. Remove the transfer cover (A) from the transfer housing (6).
2. Remove the transfer hypoid drive gear/shaft assembly (C), the 25 mm thrust shim (D), and the tapered roller bearing (E).
3. Remove the O-ring (F) from the transfer cover.
4. Remove the oil seal from the transfer cover (see «TRANSFER COVER OIL SEAL REPLACEMENT»(ref-512340-S36789083032012103100000) ).
5. Drain the transfer fluid (hypoid gear oil) from the transfer housing.
6. Cut the lock tab on the locknut using a chisel.
7. Secure the transfer housing in a bench vise with wood blocks.
8. Install the flange holder on the companion flange, then loosen the locknut.
9. Remove the flange holder.
10. Remove the locknut (A), the conical spring washer (B), the back-up ring (C), the O-ring (D), and the companion flange (E) from the transfer output shaft (hypoid gear) (F).
11. Remove the transfer output shaft (hypoid gear) (A) from the transfer housing (B), then remove the thrust washer (C) and the transfer spacer (D) from the transfer output shaft (hypoid gear).
12. Remove the oil seal (A) and the tapered roller bearing (B) from the transfer housing (C).

See also:
• CONNECTOR TO FUSE/RELAY BOX INDEX
• ENGINE REMOVAL
• ENGINE INSTALLATION
• MAINTENANCE MINDER™
• FRAME BRACE REPLACEMENT