1994 ACURA INTEGRA ESP

. Ascending Contlol
When the TCM determines that the vehicle is climbing a hill in @ position, the system extends the engagement area
of 3rd gear to prevent the transmission Irom frequenrly shitting between 3rd and 4th gears, so the vehicle can run smooth
and have more power when needed.
NOTE: Shift schedules between 3rd and 4th gear are stored in the TCM to enable the transmission to automatically
select the most suitable gear according to the magnitude of a gradient by Fuzzy logic.
. Descending Control
When the TCM determines that the vehicle is going down a hill in @ position. the shift-up speed from 3rd to 4th gear
when the throttle is closed becomes taster than the set speed for tlat road driving to widen the 3rd gear driving area.
This, in combination with engine brake from the deceleration lock-up, achieves smooth driving when the vehicle is
descending.
There are two ascending modes with different 3rd gear driving areas according to the magnitude of a gradient stored in
the TCM.
When the vehicle is in 4th gear, and you are decelerating on a gradual hill, or when you are applying the brakes on a
steep hill, the transmission will downshitt to 3rd gear. When you accelerate the transmission will then return to 4th gear.
F
0
. Deceleration Control
Vohicle SDood
When the vehicle goes around a corner, and needs to decelerate first and then accelerate, the TCM sets the data for
deceleration control to reduce the number of times the transmission shifts to obtain smooth driving. When the vehicle
is decelerating from speeds above 27 mph (43 km/h). the TCM shifts the transmission from 4th to 3rd earlier than normal
to cope with upcoming acceleration to maintain smooth driving.
NOTE:
Fuzzy Logic: Fuzzy logic is a from at artificial intelligence that lets computers respond to changing conditions much like
a human mind would.
14-21

Electrical Troubleshooting
Troubleshooting Flowchart (cont'dl
Possible Cau6e
. Disconnected shift control sole-noid valve B connector. Short or open in shift controlsolenoid valve B wire. Faulty shilt control solenoidvalve B
Solfdiagnolir [!4 Indicato. lightbllnk! eight tim6r.
Turn the ignition switch ON.
Check whother the MalfunctionIndicator Lamp {MlL) blinks (seesection I 11.
Rcpsir rho FGM-FI Syrtem lso6scciion l1l.ls the MIL blinking?
Turn the ignition swirch OFF.
Oisconn€ct the 26P and 22P con-nectors trom the TCM.Connect the Test Harness "A"
and "D" connectors to the wirohamess only. not to the TCM {sesp6ge 14-49).
Turn the ignition switch ON.
Measure the voltage betwe€n theD18 and A25 or A26 terminals.
Ropeir opon or short in WHT/BLKwiro trotweon th6 D18 termineland tho EcM.
ls the voltage 4.75-5.25 V?
Measure the voltage between th€A3 and A25 or A26 terminals.
Ropair rhort to powor rourco inGR /WHT wir6 b€twgan tho A3tormirEl and shift conLol lolonoidvalve B.
Turn the ignition switch OFF.
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To page

Pressure Testing
a While testing, be caretul of the rotating flont wheels.a Make aura litts, jacks, and sat€ty stands alo placedplop6rly {see section 1}.
CAUTION: Betore t€sting, be sure the transmission fluidis tilled to rh6 ploper l€vet.
1. Raise the car (see section i),
2. Warm up the engine {the cooling fan comes onl, thenstop the engine and connect a tachometer.
3. Connect the oil pressure gauge to each inspectionholels).
TOROUE: 18 N.m (1.8 kgf.m, 13 tbf.fr)
CAUTION: Connect ths oil prsssure gauge s€cur€_ly; be sule not to allow dust and other foleign pani_cl6s to 6nt€1 th€ inspection holo.
A/T OIL PRESSURE GAUGESET WPANEL07406-002oi+oo
A/T LOW PRESSUREGAUGE W/PANEL07/rO6-0O70300
A/T OIL PRESSURE HOSE,22'10 mmOTMAJ_PY4OI TA{4 Roquirod)
A/T OIL PRESSUBE HOSEADAPTEROTMAJ - PY/+O12014 Roqui.odl
NOTE: Use the A/T Oil Pressure Gauge Set (07406_O02OOO3) or A/T Low Pressure Gauge (07406-OOTO0OO). and the oil pressure gauge hoses and adap_ters shown above.
14-94
4. Start the engine, and measure the respective pres-
sure as follows.
a Line Pressure
a Clutch Pfessure
a Clutch Low/High Pressure
a Throttle B Pressure
5. Install a new washer and the sealing bolt in the in-spection hole and tighten to the specified torque.
TOROUE: 18 N'm {1.8 kgf.m, 13 tbf.ft)
NOTE: Do not reuse old aluminum washers.
a Line Pressure M€asurement
- 1 . Set the parking brake and block both rear wheelssecurely.
-2. Run the engine at 2,OOO rpm
-3. Shift the selecr lever to S or @ position.
-4. Measure line pressure.
LINE PRESSUREINSPECTION HOLE
NoTE: Higher pressures may be indicated it measurements are made in selector positions other than @ or @ position.
PRESSURESELECTOR
POStTTONSYMPTOMPROBABLE CAUSEFLUID PRESSURE
StandardService Limit
LineNo'ENo (or low)
lrne pressureTorque converter,
orl pump, pressure
regulator, to.que
convener check
valve
83O-88O kPa(8.5-9.O kgf/cm,,
120- I 30 psi)
78O kPa
{8.0 kgl/cm,, 1lO psi}

Valve
Assembly
NOTE:
Coat all parts with ATF belore assemblv.
a Install the valve, valve spring and cap in the valve bodyand secure with the 10116r.
ROLLER
VALVE BODY
ROLLER
VALVE EODY
VALVE
5-1-6^<
CAP
14-118
a Set the spring in the valve and install it in the valvebody.
Push the spring in with a screwdriver, then installthespring seat.
SPBING SEAT
VALVE BODY
Install the valve, spring and cap in the valve bodv.Push the cap, then install the cliD,

Transmission Housing Bearings
Mainshaft/Countershaft Bearing Replacement
1. To remove the mainshaft and counte.shaft bearingstrom the transmission housing, expand each snapring with snap ring pliers, then push the bearing outusing the special tools and a press as shown,
NOTE: Do not remove the snap rings unless it,snecessafy to clean the grooves in the housing.
ATTACHMENT,62x68mm
Io7746-
---7i
)
MAINSHAFT
Mainshaft Removal uaoiATTACHMENT-72 ,, 75 mmo7746-OOlO600
Counterrhaft Removal uao:ATTACHMENT,62x68mm07746-O010500
TRANSMISSIONt|oustitc
PRESS
14-152
SNAP BING
Expand each snap ring with snap ring pliers, insertthe new bearing pan-way into the housing using thespecialtools and a press as shown. Installthe bear-ing with the groove tacing outside the housing.
NOTE: Coat all parts with ATF.
Release the pliers. then push the bearing down intothe housing until the ring snaps in place around it,
DRIVERo7749-OOIOOOO
GnoovE
Mainshatt Inltallation us6:ATTACHMENT,72x75mm07746-0010600
Counto.shalt In3talldtion uso:ATTACHMENT.62x68mm07746-O010500
4.After installing the bearing verify the lollowing:
a The snap ring is seated in the bearing and hous-In9 grooves.
a The snap ring operates properly
a The ring end gap is correct.
END GAP: O-7 mm

Construetion
The pump is a vane-type incorporating a flow control valve (with an integrated relief valve) and is driven by a V-belt from
the crank pulley. The pump features 10 vanes, Each vane performs two intake/dischsrge operations for every rotation of
the rotor. This means that the hydraulic fluid pressure pulse becomes extremely small during discharge.
CAM RING
FLOW CONTBOL VALVE
DRIVE
Operation
The belt-driven pulley rotates the rotor through the drive shaft, As the rotor rotates, the hydraulic pressure is applied to
the vane chamber of the rotor and the vanes witl rotate while being pushed onto the inner circumference of the cam .ing.
The inner circumference of the cam ring has an extonded portion with respect to the center of the shaft. so the rollers
move downward in the axial direction as the carrier rotates. As a result of this roller movemsnt, the internal volume of the
vane chamber will change, resulting in fluid intake and discharge.
START OF FLUID INTAKE:FLUID INTAKE:FLUID MOVEMENT:FLUID DISCHABGE:
DISCHARGE P('BT
I
SHAF'
The vanes are pushed ontothe inner circumference of th6cam ring.
Th6 volums otth€ van€ cham-ber increasos so that lluid issuckod in.
Th6 sucked-in fluid moves
towsrd the discha196 pon.As the vanes return to th€their original position on theinner side, the volume of thevane chamber decreases sothe fiuid is discharg6d fromthe discharge port.
(cont'd)
INLET PORT
VANE

System Description
Steering Gearbox
The rack-and-pinion type steering gearbox has a valve unit incorporated with the pinion to control the steering fluid pres-
sure. Steering fluid from the pump is regulated by a rotary valve in the valve unit and is sent through the cylinder pipe to
the power cylinder, where hydraulic pressure is applied. The steering fluid in the other side of the power cylinder returns
through the cylinder pipe and valve unit to the reservoir.
VALVE UNIT
CYLINDER PIPE
POWEB CYLINDER
Valve Unit
Inside the valve unit is the valve, which is coaxial with the pinion shaft, and controls the steering fluid pressure. The valve
housing is connected with the fluid pipe from the pump, return pipe to the pump, and the two cylinder pipes from the
respective power cylinder.
The pinion shaft is double - structured with the input shaft connected to the pinion gear, both of which are interconnected
with the torsion bar.
The pin insened in the valve and the pinion shaft groove engage; this allows the pinion shaft to rotate together with the
Because of this construction, the difference in angle in the circumferential direction between the input shaft and the valve
becomes larger according to the torsional strength of the pinion or steering resistance. However, maximum torsion
between the shafts is regulated by the engaged splines of the shafts at the pin engagement section to hold the torsion bar
within the set value.
This allows the steering system to lunction as an ordinary rack-and-pinion type steering if the steering fluid is not pressur-
ized because of a faulty pump.
VALVE
Difforcnco in .ngl. bo{w€cn thainput shalt rnd pinion !h.tt
ln-1
B
lEngag€ with the pinionshaft groove)

17-8
INPUT SHAFT

Unovon or rcugh 8te6ring.
3
Adjust rack guide (se€ poge 17-21).
ll the probl6m is not corrected bYadjusting lhe rack guide. replacothe gearbox.
Adiud bolt t€nsion. Roplace b€lt, ifn€c€ssary {s€e page 17-20).
lf the ongin€ stalls when wheel isturned whil€ car is stoDPed ormoving at low spoed, adjust idlesp€€d (soe section 1 1 ).
ldl6 soosd low or orrrtic.
Chock power sieering Iluid levol. Itlgv6l ie excessivoly low, ch€ck forleaks in the system. Add fluid totho spocifiod level.
Air in rssorvoir. or ch€ck pow6a
steoring fluid l6v6l.
lf fluid lev6l is OK, check o-ringsand seals on both €nds of ihopump inlet hose, and th€ oilpump housing mating surfacosfor suction leaks. Reolace oarts65 n€CeSSAry.
Adjust belt tonsion (see page 17-m) or r€Dlaco beh.Pump b6lt slipping on pull6y(pump stops momontarily).
Check if pump prossure is withinthe ranoe 6.400 - 7,100 kPa (65 - 75kgr/cm,, 924 - 1,067 psil and th6gsuge needls travol is 1500 kPa {15kgflctn2, t71 p6i) or less. Check theflow control valve if the needletr.vel €xcoods 1500 kPa {15kg?cm,, i71 psi). lf rhe flow controlvalvo is normal, replace th€ pump
as an assomblv.
Sel the power itooring p.oasuregaug6. Cl066 th€ shut-off v6lv6fully and m€a5uro tho pumppr6ssur6 (6s€ pagg 17-221,
7-1