sensors HONDA INTEGRA 1994 4.G Workshop Manual

System Description
The idle speed ot lhe engine is controlled by the ldle Air Control {lAC) Valve.
The valve changes the amount ot air bypassing into the intake manifold in response to electric current controlled by the
ECM. When the IAC Valve is activated, the valve opens to maintain the proper idle speed.
#l' ----rTo FGM-FIMAINRELAY
VARIOUSSENSORS
IAC VALVE
FASTIDLETHERMOVALVE
INTAKE MAI{IFOLD
(cont'd)
BLK
r
11-79

Intake Air System
System Description
The system supplies air for allengine needs. lt consists of the intake air pipe, Air Cleaner (ACL), intake air duct, Throttle
Body (TB), ldle Air Control {lAC) Valve, tast idle thermo valve, and intake manifold.
A resonator in the intake air pipe provides additional silencing as air is drawn into the system.
nacot{TRoLSOLENOIDVALVE
To
ffi -------------+ i'"ii'i''RELAY
VARIOUSSENSORS
IABCONTROLDIAPHRAGMVALVE
-BLK--L EI{GINE- cooLnnt
tFASTIDLETHERMOVALVE
U
INTAKEAIR PIPE
INTAKEAIRDUCT
11-116

Automatic Transmission
'l4-2
14-3't 4-6
14-8
14-14
14-23
Hvdraulic Flow ...--...... 14-24
Lock-up System ........ 14-38
Eloctrical Systom
Component Location ............,...,................ I 4-45
Circuit Diagram ............. 14-46'Troubleshooting Procedures ........,..........., l4-48
Symptom-to-Component Chart
Electrical System ...... 14-50
Electrical Troubleshooting
Troubleshooting Flowchart .................... 14-52
Lock-uo Control Solenoid Valve A/8
Test .................. --.... \4-82
ReDlacement ,...,...,..,. 14-82
Shift Control Solenoid Vslve A/B
Test .................. ...... 14-83
Reolacement .............. 14-83
Transmission Control Module (TCM)*ReDlacement ........... 14-84
Mainshalt/CountershaJt SDeed Sensors
Reolacement ............. 14-85
Hydraulic Systom
Symptom-to-Component Chart
Hydraulic System
Road Test
Slall Speed
Test ..................
Fluid Level
Checking/Changing
Pressu.e Testing
Transmission
Transmission
Removal ............. ...... 14-99
lllustrated Index
Right Side Cover .................................. 1 4- 1 04
Transmission Housin9 ..................,,....... I 4-1 06
Torque Converter HousingNalve
Body .................. ... 14- 1O8
Right Side Cover
Removal ............. ...... 14-110
Transmission Housing
Removal ............. .-..-. 14-112
Torque Convener HousingNalve Body
Removal ............. ...... 14-114
Valve Caps
Description ................ 14-116
Valve Body
Repair ................ ...-.. 14-117
Valve
Assembly ...........
Oil Pump
Main Valve Body
Disassembly/lnspection/Reassembly
Regulator Valve Body
Disassembly/lnspection/Reassembly
Lock-up Valve Body
Disassembly/lnspection/Reassembly .......
Secondary Valve Body
Disassembly/lnspection/Reassembly .......
Servo Body
Disassembly/lnspection/Reassembly .......
1st-hold Accumulator/Right Side Covet
Oisassembly/lnspection/Reassembly .,..,..
Mainshaft
Disassembly/lnspection/Reassembly -.. -... 1 4- 1 29
lnsDection ................. 14- 130
Countershaft
Disassembly/lnspection/Reassembly ....... 14-132
Disassembly/Reassembly ....................... 1 4-1 33
lnsDection ................. 14-134
One-way Clutch/Parking Gear
Disassembly/lnspection .................... -.. -. 1 4-137
Sub-shaft
Disassembly/lnspection/Reassembly ....... 14-138
Disassemblv/Reassemblv ....................... 1 4-1 39
Sub-shaft Bearings
Replacement ............. l4-140
Clutch
fllustrated lndex ................. -..-...-.......... 14-1 41
Disassembly ,,,.,,........ 14-144
Reassembly .............. 14-146
Torque Converter Housing Bearings
Mainshaft Bearing/Oil Seal
Reolacement ......... 14-1 50
Countershaft Bearing Replacement .......,, 14-1 5l
Transmission Housing Bearings
Mainshsft/Countershaft Bearing
Repfacement ...-..-..14-152
Sub-shaft Bearing Replacement .............. 1 4-1 53
Reve.se ldler Gear
lnstallation ................ 14-154
Parking Brake Stopper
lnspection/Adjustment ..........................'14-'154
Transmission
Reassemblv .............,. .14_156
Toroue Converter/Drive Plate ..,..,............... 1 4- 1 63
Transmission
14-120
14-122
14-123
14-124
14-126
14-124
14-86
14-90
't4-92
14-93
14-94
lnstallation
Cooler Flushing'Shitt Cable
Removal/lnstallation ..............................
Adiustment ...-..-......-. 14-'171*Gearshift Selector
Disassembly/Reassembly .....................,. 1 4-17 2*Shift Indicator Panel
Adjustment -..........-...14-173
Throttle Control Cable
fnspection .......,..,...... 14-17 4
Adjustment .............. 14-176
14-164
14-168
14-'t 7 0
Inspection

The Automatic Transmission is a combination of a 3-e,ement torque convefter and triple-shaft electfonically controlled
automatic transmission which provides 4 speeds forward and 1 speed reverse. The entire unit is positioned in line with
the engine.
Torque Converter, Gears and Clutches
The torque converter consists of a pump, turbine and stator assembly in a single unit, The torque converter is connected
to the engine crankshaft so they turn together as a unit as the engine turns. Around the outside of the torque converter
is a ring gear which meshes with the starter pinion when the engine is being staned. The entire torque converter assem-
bly serves as a flywheel while transmitting power to the transmission mainshaft.
The transmission has three parallel shafts, the mainshaft. countershaft and sub-shaft. The mainshatt is in line with the
engine crankshaft.
The mainshaft includes the clutches for 1 st, and 2ndl4th, and gears for 3rd. 2nd, 4th, reverse and l st (3rd gear is in-
tegral with the mainshaft, while reverse gear is integral with the 4th gear).
The countershaft includes the 3rd clutch and gears Ior 3rd, 2nd,4th, reverse, lst and parking. Reverse and 4th gears
can be locked to the countershaft at its center, providing 4th gear or reverse, depending on which way the selector is moved.
The sub-shaft includes the lst-hold clutch and gears for 1st and 4th
The gears on the mainshait are in constant mesh with those on the countershaft and sub-shaft. When certain combina-
tions of gears in the transmission are engaged by the clutches, power is transmitted from the mainshaft to the counter-
shaft via the sub-shatt to provide @, E, tr. tr and @ position.
Electronic Control
The electronic control system consists of the Transmission Control Module {TCM), sensors, and 4 solenoid valves. Shift-
ing and lock-up are electronically controlled for comfortable driving under all conditions.
The TCM is located below the dashboard, behind the left side kick panel on the driver's side.
Hydraulic Control
The valve bodies include the main valve body, secondary valve body, regulator valve body. servo body, and lock-up valve
body throuqh the respective separator plates.
They are bolted on the torque converter housing.
The main valve body contains the manual valve, 1-2 shift valve, 2-3 shift valve, Clutch Pressure Cont.ol (CPC) valve,
4th exhaust valve, relief valve, and oil pump gears.
The secondary valve body contains the 4-3 kick-down valve,3-2 kick-down valve,2-3 orifice cont.ol valve, 3-4 shitt
valve, orifice control valve. modulator valve, and servo control valve
The regulator valve body contains the pressure regulator valve. lock-up control valve, torque converter check valve, and
cooler check valve.
The servo bodv contains the servo valve which is integrated with the reverse shift fork, throttle valve B, and accumulators.
The lock-ug valve bodv contains the lock-up shift valve and lock-up timing B valve. and is bolted on the secondary valve
body.
Fluid from the regulator passes through the manual valve to the various control valves.
Shitt Control Mochanism
Input to the TCM i.om various sensors located throughout the car determines which shift control solenoid valve should
be activated.
Activating a shift control solenoid valve changes modulator pressure, causing a shift valve to move. This pressurizes
a line to one of the clutches. engaging that clutch and its corresponding gear.
Lock-up Mechanism
In @ position. in 2nd, 3rd and 4th, and E position in 3rd, pressurized tluid can be drained from the back of the tor-
que converter through an oil passage, causing the lock-up piston to be held against the torque converter cover. As this
takes Dlace, the mainshaft rotates at the same speed as the engine crankshatt. Together with hydraulic control, the TCM
optimizes the timing ol the lock-up mechanism.
The lock-up valves control the range of lock-up according to lock-up control solenoid valves A and B, and 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.
(cont'd)
14-3

Description
Electronic Control System
Electronic Control System
The electronic control system consists of the Transmission Control Module (TCM), sensors. and 4 solenoid valves. Shift-
ing and lock-up are elect.onically controlled for comfortable driving under all conditions.
The TCM is located below the dashboard, behind the left side kick panel on the driver's side.
Lock-up ControlSolonoid Valvo A
14-18

Lock-up Control
From sensor input signals, the TCM determines whether to turn the lock-up
solenoid valve A and/or B accordingly.
The combination of driving siqnals to lock-up control solenoid valves A and
ON or OFF and activates lock-up control
B is shown in the table below.
Lock-up control Solenoid valve
B
Lock-up condition \
Lock-up OFFOFFOFF
Lock-up, slightONOFF
Lock-up. haltONON
Lock-up. fullONON
Lock-upduring decelerationONDuty operationOFF-ON
Shifl Conrrol
The TCM instantaneously determines which gear should be selected by various signals sent trom sensors. and actuates
the shift control solenoid valves A and B control shitting. Also. a Grade Logic Control System has been adopted to control
shifting in E] position while the vehicle is ascending or descending a slope, or reducing speed.
Shift control solenoid valve
t"*b" ,t"-l
------\B
E,E
('l st)OFFON
(2ndlONON
(3rd)ONOFF
E(4th)OFFOFF
a(2nd)ONON
tr (lst)ONOFF
l-Rl {Reverse)ONOFF
(cont'd)
14-19

Possible Cause
. Disconnected mainshaft speedsensor connecror. Short or open in mainshaltspeed sensor wrre.. Faulty mainshatt speed sensor.
NOTE:. A code 15 on the TCM doesn't alwsysmean there's an electrical problem in themainshaft or countershaft speed sensor cir-cuit; code '15 may also indicate a mechani-cal Droblem in the transmission.
3P CONNECTOR
II o o o o o o o oo o o o o I:OtlO$O$g:Sl!:OlXOl*Ofill o o o o o o o o o O o | |
I ooooooooooooo l Sciii:ddii:ijii:l:i$idi$;d6#:l o oooop oo ooo | 6
"-f
1-L(0)Y-!
(cont'd)
solf-diagnosis E indicator lightblink tiftoon timos.
Are the mainshaft and counter-shalt speed sensors installedproperly?
Disconnect the 3P connector lromthe mainshaft speed sensor.
Measure the resistance ot themainshaft speed sensor.
ls the resistance 4OO-600 O?
Disconnect the 22P connectorfrom the TCM.Connect the Test Harness "D"
conneclor to the wire harnessonly, not ot the TCM (see page14-49).
Check the continuity betweenD19 and D12 terminals and bodyground.
Rcoair short in ORN/BLU otWHT/BLU wiros botween Dlgand Dl2 to.minals and tho main-shatt speod ronsor.
Reconnect the 3P connector tothe mainshatt speed sensor,
To page 14-76
14-75

Mainshaft/Countershaft
Speed Sensors
Replacement
Disconnect the speed sensor connectors, then re-
move the harness clamp on the countershatt speed
sensor harness from the harness stay.
Remove the 6 mm bolts securing the mainshaft and
countershalt speed sensors from the transmission
housrng.
Remove the mainshaft and countershaft speed
sensors,
Installthe mainshatt and countershalt speed sensors
in the reverse order of the removal.
COUNTERSHAFTSPEED SENSOR
I{ARNESS STAY
6 x'l,O mml2 N.m{1.2 kgf.m,8.7 tbf.fr)
6 x 1.O mm12 N.m(1.2 kgf.m,8.7 tbf.ltl
14-85

- Dash sensors- Cable reel- SRS unit
General Precautions
Carefully inspect any SRS part before you install it.Do not install any part that shows signs of beingdropped or improperly handled, such as dents, cracksor deformation:
- Airbag assembly {driver's and front passenger's)
Airbag Handling and Storage
Do not try to disassemble the airbag assembly. lt has noserviceable parts. Once an airbag has been operated(deployed), it cannot be repaired or reuseo.
For temporary storage of the airbag assembly duringservice, please observe the following precautions:
. Store the removed airbag assembly with the pad sur-face up.
!@ It the airbag is impropsrty stored facsdown, accidental deployment could propel the unit withenough force to cause setious iniury
Store the removed airbag assembly on a secure flatsufface away from any high heat source (exceeding
212"Fl1OO'Cl and free of any oil. grease, detergent or
CAUTION: lmproper handling or storage can internallydamage the airbag assembly, making it inoperativ€.ll you suspect the airbag assembly has been damagod,install a new unit and rgler to the Deployment/DigposalProcedures lor disposing of the dsmaged airbag.
Use only a digital multimeter to check the system. lfit's not a Honda multimeter make sure its output is 10mA (0.01 A) or less when switched to the smallestvalue in the ohmmeter range. A tester with a higheroutput could damage the airbag circuit or cause accidental deployment and possible injury.
Do not install used SRS parts from another car. Whenmaking SRS repai.s, use only new pans.
Except when performing electrical inspections,always disconnect both the negative cable and posi-
tive cable at the battery before beginning work.
Replacement of the combination light andwiper/washer switches and cruise control switch canbe done without removing the steering wheell
- Combination light and wiper/washer switchreplacement (see page 23-160).- Cruise control sevresume switch replacement {seepage 23-2491 .
The original radio has a coded theft protection circuit.Be sure to get the customer's code number beforedisconnecting the battery.
When reinstalling the SRS unit cover, be sure it snapstogether properly.
SHORT CONNECTON {REDI
23-271

Sensor Inspection
CAUTION: Tak€ €xtra care whon painting or doing
body work in the ar€a bslow th6 dalhboard.
Avoid dirost exposure ot lh6 sonsors or wiring to hestguns, wolding, or spraying equipmont.
Di3connact both the nogativo and po3itivo b!ftery
cable3.
Connsct tho short conneclor(s) before working
bslow the da3hboard or nsar lhe dash sen3o.3.
After any degree of frontal body damage, inspect
both dash sensors. Replace a sensor if it is dented,
cracked, or deformed.
DASH SENSOR
a Be sure the sensors are installed securelv,
Inspection After Deployment
After a collision in which the airbags were deployed.
inspect the following:
1. Inspect the dash sensors for physical damage.
lf the sensors are damaged, replace them.
2. Inspect all the SRS wire harnesses, ReDlace, don'trepair, any damaged harnesses.
3. Inspect the cable reel for heat damage. lf there is
any damage. replace the cable reel.
4. After the car is completely repaired. turn the igni-tion switch on. lf the SRS indicator light comes onfor about six seconds and then goes off, the SRS
system is OK. lf the indicator light does not functionproperly, go to SRS Troubleshooting (next page).
BOLTS
23-275