Honda ACCORD HYBRID 2005 Service Manual page 860

Automatic Transmission
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Lock-up Mechanism
The lock-up mechanism operates in the D position (2nd, 3rd, 4th, and 5th), and D3 position (2nd and 3rd). The
pressurized fluid is drained f r o m the back of the torque converter t h r o u g h a fluid passage, causing the torque
converter clutch piston to be held against the torque converter cover. As this takes place, the mainshaft rotates at the
same speed as the engine crankshaft (and the IMA motor rotor). Together w i t h hydraulic c o n t r o l , the PCM optimizes
the t i m i n g and v o l u m e of the lock-up m e c h a n i s m . W h e n the shift solenoid valve D turned on by the PCM, shift
solenoid valve D pressure switches the lock-up shift valve lock-up on and off. The A/T clutch pressure control solenoid
valve C, the lock-up control valve, and the lock-up t i m i n g valve control the a m o u n t of the lock-up conditions. The shift
solenoid valve D is located on the accumulator body in the transmission, and A/T clutch pressure control solenoid
valve C is mounted on the transmission housing.
Gear Selection
The shift lever has seven positions; P: PARK, R: REVERSE, N: NEUTRAL, D: DRIVE (1st t h r o u g h 5th gear ranges), D3:
DRIVE (1st through 3rd ranges), 2: SECOND (2nd gear), and 1: FIRST (1st gear).
Position Description
P: PARK Front wheels locked; park pawl engaged w i t h park gear on countershaft. All clutches are
released.
R:REVERSE Reverse; reverse selector engaged w i t h countershaft reverse gear and 5th clutch engaged.
N:NEUTRAL
All clutches are released.
D: DRIVE
(1st through 5th)
General d r i v i n g ; starts off in 1st, then 2nd in a f e w seconds w h e n shifted the shift lever f r o m N
position, shifts automatically to 3rd, 4th, then 5th, depending on vehicle speed and throttle
position. Downshifts t h r o u g h 4th, 3rd, and 2nd on deceleration to stop, and then starts off in
2nd. The lock-up m e c h a n i s m operates in 2nd, 3rd, 4th, and 5th gears.
D3: DRIVE
(1st t h r o u g h 3rd)
Used for rapid acceleration at highway speeds and general d r i v i n g , up-hill and down-hill
d r i v i n g ; starts off in 1st, then 2nd in a f e w seconds w h e n shifted the shift lever f r o m N position,
shifts automatically to 3rd, depending on vehicle speed and throttle position. Downshifts to
2nd on deceleration to stop, and then starts off in 2nd. The lock-up m e c h a n i s m operates in 2nd
and 3rd gears.
2: SECOND Used for engine braking or better traction starting off on loose or slippery surfaces; stays in
2nd gear; does not shift up and d o w n .
1: FIRST Used for engine braking; stays in 1st gear; does not shift up.
Starting is possible only in the P and N positions because of a slide-type neutral-safety switch.
Automatic Transmission (A/T) Gear Position Indicator
The A/T gear position indicator in the instrument panel shows w h i c h shift lever position has been selected w i t h o u t
having look d o w n at the shift lever.
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