1997 HONDA CIVIC Oil pump

Automatic Transmission
Special Tools ......... .....'."".'-.-.' 14'2
Description .,....................-...... 14-3
power Flow ......,................. 14"6
Elestronic Control System .... . ................'..'.'.. 14-13
Hvdraulic Control .....'......" 1'l-19
Hydraulic F|ow...... .'.'.".'....11-21
Lock-up System '............ ... t/t'33
Electrical System
Component Locations....,.............'......'.............'.,. 14'39
PCM Circuit Diagram
lA/T Control Syst€m: '96 - 98 Models) .........'.. 1/t-40
PCM Tarminal Volt8ge/Measuring Condhions
{'96 - 98 ModeblA/T Control System ............
PCM Circuit Disgram(A/T Conlrol System: '99 - 00 Modsls) '..........' 14-44
PCM Terminal Voltage/Measuring Conditions('99 - 00 Models)A/T Control System ...
Troubleshooting Proceduros ....
Symptom-to-ComPonent Chari
Efectricaf SFiem - '96 - 98 Models '..-.-..."'.'..11-52
Eloqtrical System -'99 - 00 Modols ... .........". 1+54
EleclricatTroubl$hooting ('96 - 98 Models)
Valve Body
Repair .................... ........'.... 14-139
Valve
Assembly
ATF Pump
1,1-1i10
Inspection ...........'.......... 14-141
Main Valvs Body
Disass€mbf y/lnspoction/R.sssembly .'.'.'.'.. -. -. 1 1-1 12
Secondsry Valve BodY
Disa$embfy/lnspoction/Rsassembly ......'.'.'.'. 11-111
Regulator Valve Body
Disa$embly/lnspoction/Rea3sembly ..........'... 14-1{5
Servo Body
Disassombly/lnsp€ction/Reassembly .".'........ 14-146
Lock-up Valv6 Body
Dis$s.mbf y/ln3poction/Rea$embly .'.. -. -..'.'.' 1 1-1 17
Mainsh!ft
Dkassembly/lnep€ction Reassembly ..'...'........ 14'148
Inspoction .............'..........'. l it-149
Countsrshaft
Disa$embly/lnspeqtion/Rea3sembly .......'...'.. 1a-l51
Dba$ombly/Re$s.mblY11-152
til-46
I rl-48
Troubleshooting Flowcharts
Electrical Troubleshooting ('9!t - 00 Models)
Troublsshooting Flowchart3
Lock-up Control Solenoid vslvo A/B AssemblY
RePlacoment
Shift Cont.ol Solenoid Valve A/B A3sembly
Inspestion
Ona-way Clutch
Disassembh/lrupoction/Rca$embly .. "'........ l4-155
Clutch
lllustlttcd Ind.x {A48A, B4RA Transmlssion) ..' 14-156
tustr.tod Index (MrnA Transmi$ionl ............ til-158
...................... 14-153
L
14-56
1+81'
14-105
1+105
Replacoment ......
Mainshaft/Countorshaft Spo€d Sonsors
Replacemsnt ......'."'........... lit'108
Hydraulic System
Symptom-to-Componeni Chart
Hydraulic Sydemr+109
t4-113
1+116
11-117
Rea$emblY
14-106 Difforrr ial
llhdraied Index........ t4-156
B.ckhrh ln3poction. 14-167
Boaring Roplacemont..-..........11-167
..... 14-108 Diftrrsniial Carrior Repl8cemeni .'.-.............'...' lil-168
Oil Sall Romovalt4-t 59
Oil Soal ln3tallstion/Sidc Clearance'......'.....'... 1'l'169
Torqua Convertcr Housing Boarings
Mlin3haft Besring/Oil Scal Roplac.ment ."..'.. lil-172
Counio6hatt Betring R.plscem.nt ..'...... ....... 14-173
Test.....,......14-106
14-107
14-160
11-162
11-171
11-175
Replacement
Test .....,.,..........
Road Te3t
Linear Solenoid AsssmblY
Stall Speed
lllustrated Indax
Transmission/End Cover'. ....
Transmission Hou3ing,.............'.'......'....""..-.-.. 11-128
Torque Conve.ter Housing/Valvo Body ........... 14-130
End Cover
14-itB Park Stop
1+119 In3pection/Adiustmsnt...'......'.'............'...."""'14-175
Transmbgion
Reassombly
11-122 Torquo Convertet/Drivr Plsie ............'.'............'.. . l4-182
Transmission
11.726 Inrtallation
Tranlmission Housing Boarings
Msinsh.ft /CounteEhaft Bearings
B!pltcomgnt
Rcvo.3s ldlor Gear
lnrtallation
Cooler Flushing ..
Shift Cabls
Test
Fluid Level
Checkin9 .........."..'.'.....
Changing
Pressure Testing
Transmission
Transmission
Rgmoval ..
lil-176
.'..........'.'.'..... 1'l-183
.... lil-187
11-132Adiustmont
RemovaUlnttallation1,1-190
lit-191Transmisgion Housing
Removal ... '.'...... ......'..... 14-l3il
Tolque Convgrter Housing/valvs Body
Rsmoval .........,...... ............. 14-136
Valve CaDs
Description .......'................. t 4'138
Shift lndicator Panel
Adiu3tmant ..'.................. 14-192
ATF Coolor Hoses
Connection ..,............,.,....... l'l-192
Shift Lever .,........

O ATF FEED PIPE
O ATF STRAINER
O SERVO BODY'99 - 00 models servo body has integrally molded
servo detent.
@ SERVO SEPARATOR PLATE
(' SECONDARY VALVE BODY
@ DOWEL P|NS
O SECONDARY SEPARATOR PLATE
@ SERVO DETENT BASE ('96 -'98 models)
O ATF FEED PIPES
(D ATF FEED PIPES
O SHAFT STOP
@ CONTROL SHAFT
€D DETENT ARM SPRING
@ DETENT ARM
(9 DETENT ARM SHAFT
@ FILTER Replace.
(? CHECK BALLS
@ TOROUE CONVERTER CHECK VALVE
@ TOROUE CONVERTER CHECK VALVE SPRING
@ DOWEL PINS
@ LOCK.UP VALVE BODY
@ LOCK-UP SEPARATOR PLATE
@ REGULATOR VALVE BODY
@} DOWEL PINS
@ COOLER RELIEF VALVE SPRING
@ COOLER RELIEF VALVE
@ O-RING Replace.
@ STATOR SHAFT
@ STOP SHAFT
@ ATF FEED PIPE
@ MAIN VALVE BODY
@ ATF PUMP DRIVEN GEAR SHAFT
@ ATF PUMP DRIVEN GEAR
@ DOWEL PINS
65) ATF PUMP DRIVE GEAR
@ MAIN SEPARATOR PLATE
@ SUCTION PIPE COLLAR
@ ATF MAGNET
@ COUNTERSHAFT TOROUE CONVERTER HOUSING
BEARING
@ ATF GUIDE PLATE
@ ToRoUE CONVERTER HOUSING
@ OIL SEAL Replace.
@ MAINSHAFT TOROUE CONVERTER HOUSING
BEARING
@) olL SEAL Replace.
@ LOCK-UP CONTROL SOLENOID FILTER/GASKET
Reolace.
@ LOCK-UP CONIROL SOLENOID VALVE A/B ASSEMELY
@ CONNECTOR BRACKET
TOROUE SPECIFICANONS
Bolt/Nut No.Torque ValugSiz€Remarkg
12 N.m (1.2 kgf.m,8.7 lbnft)6x1,0mm
14-131

C O-RING Replace.
e) OIL SEAL RePlace.' FLYWHEEL HOUSING
O flVWneel }|OUSttttG GASKET Replace
6 DIFFERENTTALASSEMELY
@ lrr plsslce uruE ASSEMBLY
O O-RING Replace
@ DOWEL PIN
€) ATF PUMP ASSEMBLY(O DowEL PlN, 18 x 10 mm
O O-RING Replace.o DowEL PlN, 22 x 10 mm
lrr puup oRve cxltttt
iA SNAP RING
f3 fxaUst St|t|l, zz t 28 mm Selective part
Gt lrr punp ontve spaocxer
O PITOT FLANGE
ito nTF purrap ontve SPRoGKET HUB
(O THRUST WASHERS
@ PITOT PIPE BRACKET
O PITOT LUBRICATION PIPE
@ PITOT PIPEt3 OIL SEAL Replace.
Oa SEt AtitC, SO mm Selective Part
o3 lrr passlce ltnE HoLOER ASSEMBLY
6) o-RING Replace.
€) START CLUTCH ATF FEED PIPE
CO O-RING Replace.
€I FEEO PIPE FLANGE
@ SNAP RING
O' CONNECTOR BRACKET
@ BALL BEARING
6} SNAP RING64 COTTER RETAINER6D CoTTERS,25.5 mm selective Part6t stlnt cLutcH asseMsLv
@ secoruomv ontvE GEAR ASSEMBLY
@ o-RINGS Replace
6) DIFFERENTIAL COVER
rO ttaUSr SntU, zs t 35 mm Selective part
@ SECONDARY GEAR SHAFT
@ PARK PAWL SHAFT
@ PARK PAWL SPRING.1i PARK PAWL
@ TONGUED WASHER REPIACE,
@ PARK ROO HOLDER
@ BALL BEARING
@ o-RING Replace.
@ VEHICLE SPEED SENSOR
@ OIL SEAL Replace.
ft,
)
TOROUE SPECIFICATIONS
6x1.0mm
8 x 1.25 mm
8 x 1.25 mm
8 x 1.25 mm
12 N.m (1.2 kgnm,8.7 lbf'ft)
22 N.m (2.2 kgf'm. 16lbf'ft)
26 N.m (2.7 kgf'm, 20 lbf'ft)
29 N.m {3.0 kgf'm, 22 lbift)
14-311

System Description
Steering Pump (cont'dl
The flow control valve and sub-valve in the pump per-
forms the following steps @ through @ to control the
flow of fluid, that is to increase the discharge volume
when engine speed is low, and to decrease it when the
engine speed increases. The assistance thrust of the
steering gearbox changes in compliance with the
change in the discharge volume.
When the engine starts, fluid discharged from the
discharge port starts to flow through oil passage A,
the fixed orifice and the variable orifice to the steer-
ing gearbox. When the engine speed is extremely
low, the return port is closed by the flow control
Fluid pressure discharged from the discharge port
is applied to the top of the sub-valve, and the fluid
pressure that passed through oil passage A is applied
to the bottom of the sub-valve. When this happens,
the pressure difference between the ends of oil pas-
sage A, which is caused by the resistance oil passage
A when the fluid flows through the passage. is
applied to the sub-valve, However, the pressure dif-
ference applied to the sub-valve. that is the force
that pushes the sub-valve down, is too small to
overcome the spring force, and the variable orifice is
fully open when the engine speed is extremely low.
Because the fluid volume flowing through the fixed
orifice and variable orifice increases, a pressure dif-
terence is created between the ends of these ori-
fices, and it increases in proportion to the engine
speed. As the fluid pressure that passed the fixed
orifice and variable orifice is directed to the bottom
of the flow control valve. a pressure difference is
created between the top and bottom of the valve,
which pushes down the flow control valve and
opens the return port. As a result, pan of the fluid
discharged from the discharge port feturns to the
pump suction port, keeping the discharge volume
constant.
In this condition, the sub-valve does not move. and
the variable orifice stays fully open.
lo
trrtrrlo3
J
o
PUMP R.P.M.
To STEERING GEARBOXSUB.VALVE
To STEEnING GEARBOX
FLOW CURVE
!rs+/f/ffih\
o,,-i^"l^tKzYt)91y ul3Yl
FLOW CONTNOL VALVE
su8-vALvE
ORIFICE
ToP
17-18
FLOW CONTROL VALVE

t
To STEERING GEARBOX
To STEERING GEAREOx
@ The fluid volume that flows thorough oil passage A
and the pressure djfference applied to the sub-valve
increase in proportion to the engine speed. The
sub-valve lowers overcoming the spring force, and
it stans to close the variable orifice to regulate the
discharge volume, When this happens, the fluid vol-
ume flowing to the steering gearbox decreases as
the engine speed increases. At the same time, the
flow control valve continues to control the fluid vol-
ume to the return Port,
@ As the engine speed increases funher, the pressure
difference at the sub-valve increases further as well.
The sub-valve then closes the variable orifice com-
pletely, regulating the discharge volume further.
When this happens, the fluid volume discharged
from the pump to the steering gearbox is regulated
and maintained at a given level until the engine
speed reaches the high speed range The flow con-
trol valve functions continues to control the fluid
volume to the return Port.
Pressure Relief
Pressure at the discharge side of the fixed orifice is
directed to the bottom of the flow control valve. When
the pressure builds up, the relief valve in the flow con-
trol valve opens to release the pressure at the bottom of
the valve. This allows the flow control valve to be
pushed back by the pressure difference, and the fluid
volume to the pump return port increases.
As explained above. the system keeps the pump dis-
charge pressure (relief pressure) from exceeding the
given level by controlling the volume of the fluid to the
pump relurn pon,
1.,DAMPING ORIFICE{Docreases excessiv€vibration in the valv6.)
17-19
)
RELIEF VALVE {Opan)
SUB.VALVE
FLOW CONTROL VALVE
/F ft>..\
'-€/K\A/A
o'.'to"5lo'#2"n af11\D7
FLOW CONTROL VALVE

/
Uneven or rough steering
Steering wheel kicks back
during wide t!rns.
ll,
)
Adjust the rac* guide (see page 17-3).
lf the problem is not corrected bY
adjusting the rack guide, replace
the gearbox.
Adiust the belt tension. Feplace the
belt, il necessary (see Page 17 32).
lfthe engine stalls when the wheel
is turned while car is stopped or
moving at low speed, adjust the
idle spe€d (see section 11)
ldle speed low or erratic.
Check power sleering fluid level lf
the level is excessively low, check
lor leaks in the system. Add lluid
to the specified level.
Air in reservoir, or check Powersteering Iluid level.
lf ltuid level is OK, check O-rings
and seals on both ends of thepump inlet hose, and the P/Spump housing mating surfaces
and the pumP shaft oil seal for
suction leaks. RePlace Parts as
nocessary.
Adjust the belt tension (see Page17 32)or replace belt.Pump belt sliPPing on PLrlleY(pump stops momentarilY)
Check if pump press{rre is normal
and the gauge needle travel is 500
kPa (5 kgl/cm?, 7l Psi) or less.
Chock the flow control valve if the
needle travel exceeds 500 kPa (5
kgflcm', 71 Psi). l{ the flow control
valve is normal, replace the PumPas an assemoly.
Install the power steering pressure
gauge, Close the Pressure contrcl
valve fully and m6ssure the PumPpressure {s€e page 17-34}.
17 -25,

Power Steering Pump
Reassembly
1.Align the pin of the sub-valve with the oil passage
in pump housing. and push down the sub-valve.
Installthe snap ring properly.
OIL PASSAGEAlign the pin of
the oil passage.
PUMP HOUSINGSNAP RING
Install the new pump seal in the pump housing by
hand, then installthe pump seal spacer.
NOTE: Insert the pump seal with its grooved side
facing in.
Position the pump drive shaft in the pump housing,
then drive it in using a special tool as shown.
Install the 40 mm circlip with its radiused side fac-
ing out,
ATTACHMENT, 30 mm
BALL BEARING
40 mm CIRCLIP
d
gf'uMP oRrvE sHAFr
/ffi\
f.\'vj
H PUMP SEAL SPACER
n,/
/:K
/ZA\.-- PUMP SEAL
V Reptace.
17 -44
ROLl.ERS
Coat the pump cover seal and the cover bushing
with the power steering fluid, then install the pump
cover seal into the groove in the pump cover.
lnstall the outer side olate over the two rollers.
ROL1IR
OUTER SIDE PLATE
4.5 mm ROLLER
5 mm ROLLER
PUMP COVERBUSHING
Set the pump cam ring over the two rollers with the" o " mark on the cam ring upward.
7.
ROI,IIR SET HO'"ES
PUMP CAM RING

L
Wheel Soeed and Modulator Contlo
t
OUTLETVALVE ON
OFF
INLETVALVE ON
OFF
t\,40ToR
ON
OFF
when the wheel speed drops sharply below the vehicle speed, the inlet valve closes to retain the caliper fluid pressure
When the wheel speed drops further, the outlet valve opens momentarily to reduce the caliper fluid pressure. The pump
motor starts at this time.
As the wheel speed is restored, the inlet valve opens momentarily to increase the caliper fluid pressure.
Wheel SensoJ
The wheel sensors are the magnetic contactless type
As the gear pulser teeth rotate past the wheel sensor's magnetic coil, AC current is generated The AC frequency changes
in accordance with the wheel speed. The ABS control unit detects the wheel sensor signal frequency and thereby detects
the wheel speed.
There are four wheel sensors, one for each wheel
The gear pulser has 50 teeth.
EEL SPEED
at LOW SPEEDgl
=o
GEAR PULSEBWHEEL SENSOBat HIGH SPEED
/
19-49