Acura RL. Instruction — page 217

Fig. 14: Identifying Five-Speed Automatic Transmission System Components
Courtesy of AMERICAN HONDA MOTOR CO., INC.

1st Clutch

The 1st clutch engages/disengages 1st gear, and is located at the left end of the secondary shaft. The 1st clutch
is supplied hydraulic pressure by its ATF feed pipe within the secondary shaft.

1st-hold Clutch

The 1st-hold clutch engages/disengages 1st-hold in 1st gear in M, and is located in the 1st clutch drum. The 1st-

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2005-08 TRANSMISSION Automatic Transmission — RL

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hold clutch is supplied hydraulic pressure by its ATF feed pipe within the secondary shaft.

2nd Clutch

The 2nd clutch engages/disengages 2nd gear, and is located at the right end of the secondary shaft. The 2nd
clutch is supplied hydraulic pressure through the secondary shaft by a circuit connected to the internal hydraulic
circuit.

3rd Clutch

The 3rd clutch engages/disengages 3rd gear, and is located at the end of the intermediary shaft. The 3rd clutch
is supplied hydraulic pressure through the intermediary shaft by a circuit connected to the internal hydraulic
circuit.

4th Clutch

The 4th clutch engages/disengages 4th gear, and is located at the middle of the mainshaft. The 4th clutch is
joined back-to-back to the 5th clutch. The 4th clutch is supplied hydraulic pressure through the mainshaft by a
circuit connected to the internal hydraulic circuit.

5th Clutch

The 5th clutch engages/disengages 5th gear, as well as reverse gear, and is located at the middle of the
mainshaft. The 5th clutch is joined back-to-back to the 4th clutch. The 5th clutch is supplied hydraulic pressure
through the mainshaft by a circuit connected to the internal hydraulic circuit.

One-way Clutch

The one-way clutch is positioned between the 1st clutch hub and the secondary shaft 1st gear. The secondary
shaft 1st gear is splined to the 1st-hold clutch hub, with the 1st-hold clutch hub splined to the secondary shaft.
The secondary shaft 1st gear provides the outer race surface, and the 1st clutch hub provides the inner race
surface. The one-way clutch locks when power is transmitted from the secondary shaft 1st gear to the
countershaft 1st gear. The 1st clutch and gears remain engaged in 1st, 2nd, 3rd, 4th, and 5th gear ranges in D or
D3.

However, the one-way clutch disengages when the 2nd, 3rd, 4th, or 5th clutches and gears are applied in D or
D3. This is because the increased rotational speed of the gears on the secondary shaft causes the one-way clutch
to free-wheel with the 1st clutch still engaged.

Gear Operation

Gears on the mainshaft:

4th gear is engaged/disengaged with the mainshaft by the 4th clutch.

5th gear is engaged/disengaged with the mainshaft by the 5th clutch.

Reverse gear is engaged/disengaged with the mainshaft by the 5th clutch.

3rd gear is splined with the mainshaft and rotates with the mainshaft.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission — RL

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Gears on the countershaft:

Final drive gear is integral with the countershaft.

1st gear, 2nd gear, and 4th gear are splined with the countershaft, and rotate with the countershaft.

5th gear and reverse gear rotate freely from the countershaft. The reverse selector engages 5th gear and
reverse gear with the reverse selector hub. The reverse selector hub is splined to the countershaft so 5th
gear and reverse gear engage with the countershaft.

Idler gear is located over the 2nd gear, and rotates freely from the countershaft.

Gears on the secondary shaft:

1st gear is engaged/disengaged with the secondary shaft by the 1st clutch. 1st gear is engaged with the
secondary shaft by the one-way clutch and the 1st-hold clutch when decelerating for engine braking.

2nd gear is engaged/disengaged with the secondary shaft by the 2nd clutch.

Idler gear is splined with the secondary shaft, and rotates with the secondary shaft.

Park gear is integral with the 2nd gear.

Gears on the intermediary shaft:

3rd gear is engaged/disengaged with the intermediary shaft by the 3rd clutch.

4th gear is splined with the intermediary shaft.

Power Flow

P Position

Hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft. The countershaft
is locked by the park pawl interlocking the park gear.

N Position

Engine power transmitted from the mainshaft drives the mainshaft 3rd gear, the intermediary shaft 3rd gear, but
hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft. In this position,
the position of the reverse selector differs according to whether the shift lever shifted from D or R:

When shifted from D, the reverse selector engages with the countershaft 5th gear and the reverse selector
hub, and 5th gear engages with the countershaft.

When shifted from R, the reverse selector engages with the countershaft reverse gear, and the reverse
selector hub, and the reverse gear engages with the countershaft.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission — RL

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 15: Power Flow Diagram (N Position)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

D and D3 Positions

In D, the optimum gear is automatically selected from 1st, 2nd, 3rd, 4th, and 5th gears; and 1st, 2nd, and 3rd
gears in D3 according to conditions such as the balance between the throttle opening (engine loading) and
vehicle speed.

In 1st gear

Hydraulic pressure is applied to the 1st clutch, then the 1st clutch engages the secondary shaft 1st gear
with the secondary shaft by the one-way clutch.

The mainshaft 3rd gear drives the secondary shaft via the countershaft idler gear and secondary shaft idler
gear.

2007 Acura RL

2005-08 TRANSMISSION Automatic Transmission — RL

me

Friday, June 05, 2009 1:18:10 PM

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© 2005 Mitchell Repair Information Company, LLC.

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