Honda Civic Service Manual page 887

Description
Hydraulic Control
The hydraulic control system is controlled by the ATF pump. the valves, and the solenoids. The ATF pump
is driven by the
input shaft. The ATF pump and the input shaft are linked by the ATF pump drive chain and the
sprockets, The inhibitor
solenoid valve and the linear solenoids. which are located on their valve body, are controlled by the
TCM or pcM. Fluid
from the ATF pump flows through the PH regulator valve to maintain specified pressure to the drive pulley,
the driven pul-
ley, and the manual valve,
The lower valve body assembly includes the main valve body, the PL regulator valve body, the shift
valve body, the start
clutch control valve body, and the secondary valve bodv.
Main Valve Eody
The main valve body contains the pH control valve, the rubrication valve, and the pitot regulator valve.
PH Control Valve
The PH control valve supplies PH control pressure (PHCI in accordance with the pH-pL control pressure (HLc),
and sup-
plies PH control pressure to the PH regulator valve, which also regulatss PH pressure.
At kick-down, it increases pH
control pressure which increases the high (PH) pressure. This shortens the shift speed by releasing
the reverse inhibitor
pressure (Rl)from the inhibitor solenoid valve.
Lubrication Valve
The lubrication valve controls the lubrication pressure to each shaft and maintains lubrication pressure.
When rne pres-
sure is too high, the spring is compressed. This moves the lubrication valve and opens the fluid leak passage.
Pitot Regulalor Valv6
The pitot regulator valve controls the start clutch pressure (SC) in accordance with the engine speed, when
the electron-
ic control system is faulw.
MAIN VAIVE
BODY
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