intake HONDA CR-V 1998 RD1-RD3 / 1.G Repair Manual

Emission Control System
Positive Crankcase Ventilation (PCV) System (cont'dl
2. At idle, make sure there is a clicking sound from the
PCV valve when the hose between the PCV valve
and intake manifold is lightly pinched with your fin-
gers or pliers.
'97 - 98 models:
'99 - 00 modelsi
lf there is no clicking sound, check the PCV valvegrocrmet for cracks or damage, lf the grommet is
OK, reDlace the PCV valve and recheck.
Gently pinch here.
Gently pinch here.
11-202
www.emanualpro.com

EVAP PURGE CONTROL SOLENOID VALVE DUTY CONTROLLED AFTER
STARTING ENGINE
ENGINE COOLANT TEMPERATURE ABOVE 154"F (68'C)
Evaporative Emission (EVAP) Controls
Description:
The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The
system consists of the following components:
A. Evaporative Emission (EVAPI Control Canister
An EVAP control canister is used for the temporary storage of fuel vapor until the luel vapor can be purged from the
EVAP control canister into the enqine and burned.
B. Vapor Purge ConirolSystem
EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a pon
on the intake manifold. The purging vacuum is controlled by the EVAP purge control solenoid valve.
C. Fuel Tank Vapor Control System
When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and
regulates the flow ot fuel vapor to the EVAP control canister.
'97 model:
EVAPPURGECONTROL
VALVEFromNo. 15BLK/ /ALTERNATORYEL I sP SENSOR r7.s At(in the under-dashfuse/relay box)
VARIOUSSENSORFEESH AIF
BLK
I
FUEI- TANK
(cont'd)
11-203
INTAKE MANIFOLD
www.emanualpro.com

Transmission AssemblY
Removal
@FMak. sw. iack" and safety stands are placed propel-
ly, and hoist brackets are attached to collect position
on the engine,
. Apply parking brake and block rear wheels so vehicle
will not roll off stands and lall on you while working
under it.
CAUTION: Use fender covers to avoid damaging painted
surfaces.
1. Disconnect the negative {-) cable first, then the pos-
itive (+) cable from the batterY.
2. Remove the intake air duct and air cleaner houslng
(see section 5).
3. Remove the slave cylinder and clutch hose bracket'
NOTE:
. Do not operate the clutch pedal once lhe slave
cvlinder has been removed.
. Take care not to bend the clutch line.
4. Disconnect the
ground cable.
starter cables and transmission
TRANSMISSIONGROUND CABLE
Disconnect the back-up light switch connector and
wire harness clamP.
(cont'd)
13-7
WIRE HARNESS CLAMP
www.emanualpro.com

Transmission Assembly
Installation (cont'dl
24. Connect the starter cables and transmission ground
caore.
TRANSMISSIONGROUND CABLE
Apply grease to the push rod on the slave cylinder,
then install the slave cylinder and clutch hose bracket,
NOTE: Use only Super High Temp Urea Grease
{P/N 08798 - 9002).
CI-UTCH HOSEBRACKET
8 x 1.25 mm22 N.m 12.2 kgi-m,16 tbr.f0
6x1.0mm9.8 N.m {1.0 kgf.m,7.2 rbf.ftt_G1(P/N 08798
6x1.0mm9.8 N.m (1.0 kg{.m,7.2 tbt.ttl
13-76
- 9002)
26. Turn the breather cap so that the "F" mark points at
the right side of the vehicle as shown.
27. Install the intake air duct and air cleaner housing(see section 5),
28. Connect the positive (+) cable first. then the nega-
tive (-) cable to the battery.
29. Check the level of the transm ission f lu id.
30. Check the clutch operation.
31. Shift the transmission and check for smooth opera-tion.
32. Check the front wheel alignment (see section l8).
www.emanualpro.com

Transmission
Removal
@
2.
'1.
Make sure lifts. iacks, and safety stands aro placed
properly, and hoist brackets are attached to the col-
rest position on the engine lsee section 11.
Apply th€ parking brake and block the r€ar wheels,
so vehicls will noi roll off the stands and fall on you
while working under it.
NOTE: Use fender covers to avoid damaging painted
surfaces.
Disconnect the negative terminal, then disconnect
the positive terminal from the battery.
Remove the intake air duct and the air cleaner hous-
ing assembly,
Remove the starter cables. Remove the harness
clamp from the clamp bracket.
5.
STARTERCABLES
Remove the transmission ground cable terminal
and the radiator hose clamp lrom the transmission
hanger.
Disconnect the lock-up control solenoid valve con-
nector, then remove the harness clamp from the
clamp bracket.HARNESS CLAMP
RADIATOR HOSECLAMP
CONTROLSOLENOID VALVECONNECTOR
CLAMP
6. Disconnect the vehicle speed sensor (VSS), the coun-
tershaft speed sensor, and the A/T gear position
switch connectors.
A/T GEAR POSITIONSWITCH CONNECTOR
VEHICLE SPEEDSENSOR |VSS'
CONNECTORBfiACKET
SPEED SENSORCONNECTOR
7. Remove the transmission housing mounting bolts.
MOUNTING BOLTS
(cont'd)
14-169
www.emanualpro.com

26. Connect the vehicle speed sensor (VSS). the coun-
tershaft speed sensor. and the A,/T gear position
switch connectors,
VEHICLE SPEEO
SPEED SENSOACO'{NECTOR
Connect the lock-up control solenoid valve connec-
tor, then install the harness clamp on the clamp
bracket.
HARNESS CI-AMP
27.
RADIATOR HOSECLAMP
TRANSMISSIONGROUND CAB1ITERMINAL
LOCK-UP OONTROLSOLENOID VALVECONNECTOR
6x1.0mm12 N'm (1.2 kgi.m,8.? tbtftl
28.
29.
Instail the transmission ground cable terminal on
the transmission hanger, and install the radiator
hose clamp on the transmission hanger,
Connect the starter cables to the starter, and install
the harness clamD on the clamD bracket. Make sure
the crimped side of the starter cable ring terminal is
facing out.
STARTEBCABLE
STARTER CAAtf,
Install the air cleaner housing assembly and the
intake air duct.
Refill the transmission with ATF (see page 14-161).
Connect the battery positive terminal and negative
terminal.
Set the parking brake, Start the engine, and shift the
transmission through all gears three times.
Check the shift cable adjustment (see page 14-271]-.
Check the tront wheel alignment and adjust it if
needed (see section 18).
Let the engine reach normal operating temperature
(the radiator fan comes on) with the transmission in
E or N position, then turn it off and check the ATF
level {see page 14-160).
Perform a road test (see page 14-157 and 14-158).
30.
31.
34.
CLAMP BRACKET
37.
14-263
www.emanualpro.com

Description
Rear Differential
Outline
The Real-time 4WD-Dual Pump System model has a hydraulic clutch and a differential mechanism in the rear differential
assembly. Under normal conditions, the vehicle is driven by the front wheels. However, depending on to the driving force
of the front wheels and the road conditions. the system instantly transmits appropriate driving force to the rear wheels
without requiring the driver to switch between 2WD (tront wheel drive) and 4WD (four wheel drive). The switching mecha-
nism between 2WD and 4WD is integrated into the rear differential assembly to make the system light and compact.
ln addition, the dual-pump system switches off the rear-wheel-drive force when braking in a forward gear. This allows the
braking system to work properly on models equipped with an Anti-lock Braking System (ABS).
Construction
The rear differential assembly consists of the torque control differential case assembly and the rear differential carrier
assembly. The torque control differential case assembly consists of the differential clutch assembly, the companion
flange, and the oil pump body assembly. The rear differential carrier assembly consists of the differential mechanism. The
differential drive and driven gears are hypoid gears.
The oil pump body assembly consists of the front oil pump, the rear oil pump, the hydraulic control mechanism, and the
clutch piston. The clutch piston has a disc spring that constantly provides the differential clutch assembly with a preset
torque to Drevent abnormal sound.
The clutch guide in the differential clutch assembly is connected to the propeller shaft via the companion flange, and it
receives the driving force lrom the transfer assembly. The clutch guide rotates the clutch plate and the front oil pump in
the oil pump body.
The clutch hub in the differential clutch assembly has a clutch disc that is splined with the hypoid drive pinion gear. The
hypoid drive gear drives the rear oil pump.
The front and rear oil pumps are trochoidal pumps. The rear oil pump capacity is 2.5 percent larger that the front oil pump
to handle the rotation difference between the front and rear wheels caused by worn front tires and tight corner braking.
The oil pumps are designed so the fluid intake works as a fluid discharge when the oil pumps rotate in reverse. Genuine
Honda CVT fluid is used instead of differential fluid.
Operation
When there is a difference in rotation speed between the front wheels (clutch guide) and rear wheels (hypoid driven gear),
hydraulic pressure from the front and rear oil pumps engages the differential clutch, and drive force from the transler
assembly is applied to the rear wheels.
The hydraulic pressure control mechanism in the oil pump body selects 4WD mode when the vehicle is started abruptly,
or when accelerating in a forward or reverse gear (causing rotation difference between the front and rear wheels). or
when braking in reverse gear {when decelerating). lt switches to 2WD mode when the vehicle is driven at a constant speed
in forwar! or reverse gear (when there is no rotation difference between the front and rear wheels), or when braking in a
fo rwa rd gear (when decelerating).
To protect the system, the differential clutch assembly is lubricated by hydraulic pressure generated by the oil pumps in
both 4WD and 2WD modes. Also, the thermal switch relieves the hydraulic pressure on the clutch piston and cancels 4WD
mode if the temDerature of the differential fluid rises above normal.
www.emanualpro.com

5. To comDlete the charts:
. Markthe delivery temperature along the vertical line'
. Markthe intake temperature {ambient air temperature) along the bottom line'
. Draw a line straight up from the air temperature to the humidity'
. Mark a point 10% above and 10% below the humidity level'
a From each point, draw a horizontal line across the delivery temperature'
. The deliverv temperature should fall between the two lines'
. Complete the low-side pressure test and high-side pressure test in the same way'
. Anv measurements outside the line may indicate the need for further inspection
kPa{kst/cm')Ipsil
29r,0t30tl,a0l
2500(251
t3601
2000 ll20l I kp.t28ol | {ksf/cmz} "F
I lcsil Pcl1s00'l ,l0o I 85 -l
{15} | (4} | (301
r21or I t57l I I
ttl980 j 3oo -.J "r1 Irlol {31 I l25l Ir14ol r13l I ILI200 -l 68 Jt2) | (2ot Ir28r I II100 -.1 ss l
TNTAKE lli' I
(15r
IPRESSURE ] |50 -l
,to,
IDELIVERY ITEMPEBATURE .t :.] _rsl -ll
80v.
HUMIDITYLEVEI-
HUMIOITYLEVEL
HUMIDITYLEVEL
80vo
DELIVERYPRESSURE
fl6g j7 * 95 104
t2o) l25l (30) (351 (ro)fct
INTAKE TEMPERATURE
22-57
www.emanualpro.com