1998 ACURA INTEGRA Engine

The valve bodies include the main valve body, the secondary valve body, the regulator valve body, the servo body andthe lock-up valve bodv.
The ATF pump is driven by splines behind the torque converter which is attached to the engine, Fluid {lows through
the regulator valve to maintain specified pressure through the main valve body to the manual valve, directing pressure
to each of the clutches.
SHIFT CONTROL SOLENOIDVALVE ASSEMBLY
RIGHT SIDE COVER
LOCK'UP VALVE BODYSERVO BODY
SECONDARY VALVEBODY
VALVE BODY
REGULATOR VBODY
LOCK-UPOIL PUMP GEARS
SOLENOID VALVEASSEMBLYTOROUEHOUSING
{cont'd)
%<->--::/ )C)
IrY,
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Rogulator Valve
The regulator valve maintains a constant hydraulic pressure from the ATF pump to the hydraulic control system. while
also furnishing fluid to the lubricating system and torque converter.
Fluid flows through B and B'. The fluid enters through B and flows through the valve orifice to A, pushing the regulator
valve to the right. According to the level of hydralic pressure through B. the position of the valv€ changes, and the
amount of the fluid through D from B' thus changes. This operation is continued, maintaining the line pressure.
NOTE: When used, "left" or "right" indicates direction on the illustration below.
{ENGINE NOT RUNNINGI{ENGINE RUNNINGI
STATOR SHAFT
Stator Reactior Hydrrulic Prcsrure Control
Hydraulic pressure incresse, according to torque, is performed by the regulator valve using stator torque reaction. The
stator shaft is splined to the stator and its arm end contacts the regulator spring cap. When the vehicle is accelerating or
climbing (Torque Converter Range), stator torque reaction acts on the stator shaft and the stator shaft arm pushes the reg-
ulator spring c8p in the direction of the srrow in proportion to the reaction. The spring compresses and the regulator valve
moves to incrsase the regulated conlrol pressure or line pressure. Line pressure is maximum when the stator reaction is
maximum.
TOR VALVE
{cont'dl
From ATF PUMP
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STATOB SHAFTSTATOR SHAFT ARM
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Llfl Position
As the engine turns, the ATF pump also starts to operate. Automatic transmission fluid (ATF) is drawn from (99) and
discharged into (1). Then, ATF pressure is controlled by the regulator valve and becomes line pressure (1). The torque
converter inlet pressure {92} enters (94) ol torque converter through the orilice and discharges into {9O).
The torque converter check valve prevents the torque converter pressure from rising.
Under this condition, the hydraulic pressure is not applied to the clutches.
NOTE: When used, "l€ft" or "right" indicates direction on the hydraulic circuit.
(cont'dl
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Description
Hydraulic Flow {cont'dl
l ll or &j Position
1. lst Geal
The flow of fluid through the torque converter circuit is the same as in lll postion.
The line pressure (1) becomes line pressure (4) and it becomes the 1st clutch pressure (10). The 1st clutch pressure is
applied to the 1st clutch and 1st accumulator; consequently, the vehicle will move as the engine power is transmitted.
The line pressure (1) becomes the modulator pressure (6) by the modulator valve and travels to 1-2 and 3-4 shift
valves. The l-2 shift valve is moved to the right side because the shift control solenoid valve A is turned OFF and B is
turned ON by the TCM. This valve stops 2nd clutch pressure and power is not transmitted to the 2nd clutch.
Line pressure (4) also flows to the servo valve and line pressure (l ) also flows to throttle valve B.
NOTE: When used, "|eft" or "right" indicates direction on the hydraulic circuit.
fr
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Description
Lock-up System
Lock-up Clutch
1. Operation (clutch on)
With the lock-up clutch on, the fluid in the chamber between the torque converter cover and lock-up piston is discharged,
and the converter fluid exerts pressure through the piston against the converter cover, As a result, the converter turbine islocked on the converter cover firmly. The effoct is to bypass the converter, thereby placing the vehicle in direct drive.
t-owerlrotl
The power flows by way of:
Engine
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Drive plate
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Torque converter
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Lock-up piston
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Damper spring
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Turbine
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Mainshatt
2. Operation (clutch otl)
With the lock-up clutch oft, the tluid flows in the reverse of "clutch on." As a result, the lock-up piston is moved away
from the converter cover; that is, the torque converter lock-up is released.
tro-wt rrotl
Engine
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Drive plate
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Torque converter cover
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Pump
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Turbine
Mainshaft
LOCK-UP PISTON
TOROUE CONVERTERCOVER
:1
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TURBINE
tl
u
v

In E position in 2nd, 3rd and 4th, and E position in 3rd, pressurized fluid is drained from rhe back of the torque con-
verter through a fluid passage, causing the lock-up piston to be held against the torque converter cover. As this takes
place, the mainshaft rotates at the same speed as the engine crankshatt. Together with hydraulic control, the TCM op-
timized the timing of the lock-up system. Under certain conditions, the lock-up clutch is applied during deceleration in
3rd and 4th gear.
The lock-up system controls the range of lock-up according to lock-up control solenoid valves A and B, and the throttle
valve B. When lock-up control solenoid valves A and B activate, modulator pressure changes. Lock-up control solenoid
valves A and B are mounted on the torque converter housing. and are controlled by the TCM.
LOCK,UP CONTROL
LOCT.UP SHIfT VALVE
AlF COOIER
tocK uP coNTno! valvE
Solenoid valve
L*r""r "o.Jtio" \B
Lock'up OFFOFFOFF
Lock-up, slightONOFF
Lock-up, halfONON
Lock-up, fullONON
LOCK-Updu.ing decelerationONDuty operationOFF - ON
IOCK UP TIMING B VATVE
(cont'd)
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THROTTLErcsm0NSENSOR
ENGINECOOLANTTEMPERATURESENSOR
WHT/BLKBLK/RED
820424
OBNREO/BLK
84
J
MAINSHAFI COUNTERSHAFISPEED SENSOR SPfED SENSOR
I SHIFT CONTROL I LOCK -UP CONTBOL
+135Eil,?1o'uo'u' 4i85El,o''P'uo'u'
TCM T6nninal locations
TCM -B l22P)Conn€ctor
VREF IATCHK IBASOSS IAFSA IAFSB IFAS ISCS
----T;- t-T-*
+.. | +.., I + ,+
l+ | J l/vt-l .i{-'1M-l L-{-lr^/t-lt't'/!-?
*\::
r--rr!\.1 -r!\./ rartsurssrot coNTFoL M'DULE tTcMr
ltEltn r' -rrt= t= t? t=
NMSG INC INCSG ISH A ISH B ILC A ILC B
576I101112578I10
151617,/1,/20251214,/1,/171920,/1,/J
TCM -A (26P1 Connector
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TCM Terminal Voltage/Measuring Conditions
A l26Pl ConnectorB (22PlConnector
TCM Terminal Locations
256789'1011132351II10
11,/l/2024261214,/l/1120,/1,/
T6rminal NumberSignalDescriptionMeasuring Conditions/T€rminal Voltag€
A'INot used
A2
SHBShift control solenoid valve B
control
In 1st and 2nd gear in E anO E positions and
E position: Battery voltage
ln E position,3rd and 4th gear in E anO Epositions:0 V
SHAShift control solenoid valve A
control
In E, E positions,2nd and 3rd gear in E and
E positions: Batteryjloltage
In lst gear in !d and -qtl positons and 4th gear
in E oosition: 0V
A4Not used
A5NEEngine speed signal inputWhen engine is rotating: Pulsing signal
ATPlA,/T gear position switch
E position input
In L!-l position: 0 V
In other than I position: Battery voltage
A7ATP2Ay'T gear position switch
E position input
In 13 position:0 V
In other than E position: Battery voltage
A8ATP D3A,/T gear position switch
E position input
In E position:0V
In other than @ position: Battery voltage
A9ATP D4A,/T gear position switch
E position input
InEposition;0V
In other than El position: Battery voltage
410ATP PNA,/T gear position switch
E and E positions input
InEorEpositions:OV
In other than E or N position: Battery vottage
411ATP RA/T gear position switch
E position input
lnEposition: oV
ln other than E position: 8attery voltage
412tGlPower supply systemWith ignition switch ON (lll: Battery voltage
413LG1Ground
A14Not used
A15LCBLock-up control solenoid valve B
control
During hall and full lock-up and during deceler-
ation: Battery voltage
During no lock-up:0 V
A16LCALock-up control solenoid valve A
control
When lock-up is ON; Battery voltage
With no lock-up: 0 V
417D4 INDD4 Indicator light controlWhen ignition switch is first turned ON (ll):
Battery voltage for two seconds
In E position: Battery voltsge
A18Not used
A19Not used
420AT CHKUpshifvdownshift comparative
signal output
With ignition switch ON (ll): Pulsing signal
421Not used
422ILUInterlock controlWhen ignition switch is ON (ll), brake pedal
deoressed and accelerator oedal released:
Battery voltage
423VBUBack-up power systemAlways Battery voltage
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