ldle Control System
Fast ldle Thermo Valve lA/T)
Description
To prevent erratic running when the engine is warming
up, it is necessary to raise the idle speed. The fast idle
thermo valve is controlled by a thermowax plunger.
When the engine is cold, the engine coolant surround-
ing the thermowax contracts the plunger, allowing addi-
tional air to be bvDassed into the intake manifold so that
the engine idles faster. When the engine reaches operat-
ing temperature. the valve closes, reducing the amount
of air bypassing into the intake manifold.
IDLEADJUSTING
IDLETHERMOVALVE
AIR BYPASS VALVE
11-168
Inspgction
NOTE: The fast idle thermo valve is factory adjusted; it
should not be disassembled.
1. Remove the intake air duct from the throttle body.
2. Start the engine,
3. Put your finger over the lower port in throttle body,
and make sure that there is air flow with the engine
cold (engine coolant temperature below 86"F, 30'C).
lf there is no air flow, replace the fast idle thermo
valve and retest,
O-RINGSReplace.
11.0 kgfl.m, 7.2 lbl.ftl
Start the engine. Hold the engine at 3,000 rpm with no
load (in Park or neutral) until the radiator fan comes
on, then let it idle.
Check that the valve is completely closed. lf the valve
is leaking, the idle speed will drop when you cover the
lower pon. Check the engine coolant level and for air
in the engine cooling system {see section 10). lf the
cooling system is OK, replace the fast idle thermo
valve and recheck.
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Emission Control System
System Description
The emission control system includes, a Three Way
Catalytic Converter {TWC), Positive Crankcase Ventilation
(PCV) svstem and Evaporative Emission (€VAP) Control
system. The emission control system is designed to meet
federal and state emission standards.
Tailpipe Emission
Inspsction
!@ Do not smoke during this procsdura. Keep
any open tlame away from your work area.
1. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on, then let it idle,
Connect a tachometer.
Check and, if necessary, adjust the idle speed, (see
page 11-169, 170).
Warm up and calibrate the CO meter according to the
meter manufacturer's instructions.
Check idle CO with the headlights, heater blower, rear
window defogger, cooling fan, and air conditioner off.
(Canada) Pull the parking brake lever up. Start the
engine, then check that the headlights are off.
CO meter should indicate 0.1% maximum.
4.
Three Way Catalytic Converter (TWCI
DsscriDtion
Three Way Catalytic Convertsr lTwcl:
The Three wav Catalvtic Converter (TWC) is used to
convert hydrocarbons (HC), carbon monoxide (CO), and
oxides of nitrogen (NOx) in the exhaust gas to carbon
dioxide (COr), dinitrogen (Nr) and water vapor,
{cont'd)
1 1-199
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Shift Control
The PCM determines which gear should be selected by various signals sent from sensors, and actuates the shift control
solenoid valves A and B to control shifting. Also. a Grade Logic Control System has been adopted to control shifting in E
anO E ('gZ - gg), and E ('99 - 00) position while the vehicle is ascending or descending a slope, or reducing speeo.
PositionGearShift Control Solenoid
Valve A
Shift Control Solonoid
Valve B
E, E, Or
E
'I stOFFON
2ndONON
3rdONOFF
E orE4thOFFOFF
a2ndONON
tr1stOFFON
E-ReverseONOFF
*See page 14-37 for reverse inhibitor control description.
Lock-up Control
From sensor input signals, the PCM determines whether to turn the lock-up ON or OFF, and activates lock-up control
solenoid valve A and/or B accordingly. Lock-up does not occur until the engine is warm. The combination of driving sig-
nals to lock-up control solenoid valves A and B and the linear solenoid pressure is shown in the table below.
Lock-up ConditionsLock-up Control
Solonoid Valve A
Lock-up Control
Solenoid Valve B
Linear Solenoid
Pressuro
LOCK-Up \JrrOFFOFFHigh
Lock-up, HalfONDuty operation
OFF - ON
Lock-up, FullONONHish
Lock-up
during decelerationONDuty operation
OFF - ONLow
(cont'd)
14-17
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Regulator Valve
The regulator valve maintains constant hydraulic pressure from the ATF pump to the hydraullc control system, while also
furnishing fluid to the lubricating system and torque converter. Fluid from the ATF pump flows through B and B'. Fluid
entering from B flows through the valve orifice to the A cavity. This pressure of the A cavity pushes the regulator valve to
the right side. and this movement of the regulator valve uncovers the fluid port to the torque converter and the relief
valve. The fluid flows out to the torque converter and the relief valve, and the regulator valve moves to the left side.
According to the level of the hydraulic pressure through B, the position of the regulator valve changes and the amount of
fluid from B,through the torque converter also changes. This operation is continued, maintaining the line pressure.
NOTE; When used, "|eft" or "right" indicates direction on the illustration below.
ENGINE NOT RUNNING
STATOR SHAFT ABM
Stator Reaction Hydraulic Pressurs Control
Increases in hydraulic pressure according to torque are performed by the regulator valve using stator torque reaction. The
stator shaft is splined to the stator in the torque converter, 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
arm pushes the regulator spring cap in the direction of the arrow in proportion to the reaction. The stator reaction spring
compresses, and the regulator valve moves to increase the line pressure. Line pressure reaches its maximum when the
stator torque reaction reaches its maximum.
TOROUE CONVERTER
REGULATON VALVE
STATOR REACTION
TOR SPRING CAP
(cont'd)
ENGINE RUNNING
To TOROUE CONVERTER Lubtication
STATONSTASHAFTATOF SHAFT ARM
14-27
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Transmission
Removal (cont'd)
8. Disconnect the mainshaft sp€ed sensor, the shift
control solenoid valve, and the linear solenoid con-
necrors,
Remove the drain plug. and drain the automatic
transmission fluid {ATF). Reinstall the drain plug
with a new sealing washer.
DRAIN18 x 1.5 mm4e N.m rs.o ksr.m. 36 rbrft) ;:i:$: *o"*."
SENSOR CONNECTOR
14-170
OAMPER FORKReplace.
10. Remove the guard bar and the splash shield.
Remove the cotter pins and castle nuts, then sepa-
rate the ball joints from the lower arms (see section
18).
Remove the right damper fork bolt, then separateright damper fork and damper.
11.
12.
SELF.LOCKINGNUTReplace.
CASII.E NUT
DAMPER FORKBOLT
DAMPER PINCH BOLT
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ATF FEED PIPE,8 x 145 mmATF STRAINERSERVO BODYSERVO SEPARATOR PLATESECONDARY VALVE EODYDOWEL PINSECONDARY SEPARATOR PLATESERVO DETENT BASE ('97 - 98 model3 onlylATF FEED PIP€, 8 x 145 mmATF FEED PIPE,8 x 40 mmATF FEED PIPE. 8 x 62 mmATF FEED PIPE.8 x 112 mmATF FEED PIPE, 8 x 192.5 mmATF FEEO PIPE. I x 105.8 mmSTOP SHAFT BRACKETATF LUBRICATION PLATEATF FEEO PIPEDOWEL PINLOCK-UP VALVE EODYLOCK-UP SEPARATOR PLATEREGULATOR VALVE BODYDOWEL PINCOOLER RELIEF VALVE SPRINGCOOLER RELIEF VALVETOROUE CONVERTER CHECK VALVE SPRINGTOROUE CONVERTER CHECK VALVECONTROL SHAFTOETENT ARM SPRINGOETENT ARMDETENT ARM SHAFTFILTER Replace.CHECK BALLSlST ACCUMULATOR CHOKEO"RING Replace.STATOR SHAFTSTOP SHAFTATF FEED PIPE, I x 112 mmMAIN VALVE BOOYATF PUMP DRIVEN GEAR SHAFTATF PUMP DRIVEN GEAR
TOROUE SPECIFICATIONS
MAIN SEPARATOR PLATEDOWEL PINATF PUMP DRIVE GEARSUCTION PIPE COLLARCOUNTERSHAFT TOROUE CONVERTER HOUSINGBEARINGATF GUIDE PLATELOCK WASHER Replace.CONTROL LEVER ASSEMBLYTOROUE CONVERTER HOUSINGCHANGE SHAFTOIL SEAL Reolace.MAINSHAFT OIL SEAL Reolace.MAINSHAFT TOROUE CONVERT€R HOUSINGBEARINGLOCK.UP CONTROL SOLENOID VALVE A/BFILTER/GASKET Replace.LOCK.UP CONTROL SOLENOID VALVE A/BASSEMBLY
@@@@@
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Bolt/Nut No.Torque ValugSizeRomarks
64
6B
12 N'm (1.2 kgf.m,8.7 lbf.ft)
14 N.m (1.4 kgf.m, 10 lbf.ft)
6x1.0mm
6x1.0mm
14-179
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ai_la2',
(41/4.:4.
\7)
1.0)tl
(3]
t9.1q
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69
aa.21
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04
6!)ent00t.@
ATF FEED PIPE, I x 145 mm
ATF STRAINERSERVO BODYSERVO SEPARATOB PLATESECONDABY VALVE BOOYDOWEL PINSECONDARY SEPARATOR PLATE
SERVO DETENT BASE ('98 model onlvl
ATF FEED PIPE, 8 x 145 mmATF FEED PIPE.8 x 40 mmATF FEED PIPE,8 x 62 mmATF FEED PIPE, I x 112 mm
ATF FEED PIPE, 8 x 192.5 mm
ATF FEED PIPE, 8 x 105.8 mm
STOP SHAFT BRACKETATF LUERICATION PLATEATF FEED PIPEDOWEL PINLOCK-UP VALVE BODYLOCK-UP SEPARATOR PLATE
REGULATOR VALVE BOOYDOWEL PINCOOLER RELIEF VALVE SPRINGCOOLER BELIEF VALVETOROUE CONVERTER CHECK VALVE SPRING
TOROUE CONVERTER CHECK VALVECONTNOL SHAFTDETENT ARM SPRINGDETENT ARMDETENT ARM SHAFTFILTER Replace.CHECK BALLS1ST ACCUMULATOR CHOKEO-RING Replace.STATOR SHAFTSTOP SHAFTATF FEED PIPE. 8 x 112 mmMAIN VALVE BODYATF PUMP DRIVEN GEAR SHAFTATF PUMP DRIVEN GEAR
MAIN SEPARATOR PLATE
DOWEL PINATF PUMP DRIVE GEARSUCTION PIPE COLLARCOUNTEBSHAFT TOROUE CONVERTER HOUSING
BEARINGATF GUIDE PLATEATF MAGNETTOBOUE CONVERTER HOUSINGOIL SEAL Beplace.MAINSHAFT OIL SEAL Replace.MAINSHAFT TOROUE CONVERTER HOUSING
BEARINGLOCK.UP CONTROL SOLENOID VALVE A/B
FILTER/GASKET Replace.LOCK-UP CONTROL SOLENOID VALVE A/B
ASSEMELY
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TOROUE SPECIFICATIONS
Bolt/Nut No.Torque ValueSizeRemarks
12 N.m (1.2 kgim,8.7 lbf'tt)6x1.0mm
14-185
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1.Remove the control lever mounting bolt trom the
torque converter side of the torque converter hous-
ing. (4WD)
Remove the ATF feed pipes from the servo body,
secondary valve body, lock-up valve body, and main
valve body.
For '97 - 98 models:
Remove the two bolts securing the ATF strainer and
servo detent base, then remove the strainer and the
base.
For'99 - 00 models;
Remove the ATF strainer {one bolt).
4. For'97 - 98 models:
Remove the seven bolts securing the servo body,
then remove the servo body and separator plate'
For'99 - 00 models:
Remove the eight bolts securing the servo body,
then remove the servo body and separator plate'
5. Bemove the three bolts securing the secondary
valve body, then remove the secondary valve body'
stop shaft bracket, and separator plate.
6. Remove the eight bolts securing the ATF lubrication
plate and lock-up valve body, then remove the ATF
lubrication plate, lock-up valve body' and separator
plate.
7. Remove the one bolt securing the regulator valve
body, then remove the regulator valve body'
8. Remove the stator shaft and stop shaft.
9. Remove the detent spring from the detent arm, then
remove the control shaft from the torque converter
houslng.
10. Remove the detent arm and detent arm shaft from
the main valve body.
11. Remove the five bolts securing the main valve
body, then remove the main valve body.
When removing the main valve body, do not let the
eight check balls fall out.
12. Remove the ATF pump driven gear shaft, then
remove the ATF PumP gears.
13. Remove the main separator plate with two dowel
prns.
14, Clean the inlet opening of the ATF strainer thor-
oughly with compressed air, then check that it is in
good condition, and the inlet opening is not clogged
or damaged.
15.
INLET OPENING
Test the ATF strainer by pouring clean ATF through
the inlet opening, and replace it if it is clogged or
damaged.
14-191
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