2001 HONDA CR-V engine

Emission
s Control s

Th e burnin g o f gasolin e in you r
vehicle' s engin e produce s severa l by -
products . Som e o f thes e ar e carbo n
monoxid e (CO) , oxide s o f nitroge n
(NOx ) an d hydrocarbon s (HC) .
Gasolin e evaporatin g fro m th e tan k
als o produce s hydrocarbons . Con -
trollin g th e productio n o f NOx , CO ,
an d H C is importan t t o th e environ -
ment . Unde r certai n condition s o f
sunligh t an d climate , NO x an d H C
reac t t o for m photochemica l "smog. "
Carbo n monoxid e doe s no t contri -
but e to smo g creation , bu t i t i s a
poisonou s gas . Th
e Clea n Ai r Ac t
Th e Unite d State s Clea n Ai r Act *
set s standard s fo r automobil e
emissions . I t als o require s tha t
automobil e manufacturer s explai n t o
owner s ho w thei r emission s control s
wor k an d wha t to do to maintai n
them . Thi s sectio n summarize s ho w
th e emission s control s work .
Schedule d maintenanc e is o n pag e

188 .

* I n Canada , Hond a vehicle s compl y
wit h th e Canadia n Moto r Vehicl e
Safet y Standard s (CMVSS ) fo r
Emission s vali d a t th e tim e the y ar e
manufactured .
Crankcas
e Emission s Contro l
Syste m

You r vehicl e ha s a Positiv e

Crankcas e Ventilatio n System . Thi s

keep s gasse s tha t buil d u p in th e
engine' s crankcas e fro m goin g int o
th e atmosphere . Th e Positiv e Crank -
cas e Ventilatio n valv e route s the m
fro m th e crankcas e bac k t o th e
intak e manifold . The y ar e the n
draw n int o th e engin e an d burned .

Evaporativ e Emission s Contro l

Syste m

A s gasolin e evaporate s i n th e fue l
tank , a n evaporativ e emission s
contro l caniste r fille d wit h charcoa l
adsorb s th e vapor . I t i s store d in thi s
caniste r whil e th e engin e is off . Afte r
th e engin e is starte d an d warme d up ,
th e vapo r i s draw n int o th e engin e
an d burne d durin g driving .
Technica l Informatio n

Emission
s Control s

Exhaus t Emission s Control s
Th e exhaus t emission s control s
includ e thre e systems : PGM-FI ,
Ignitio n Timin g Contro l an d Thre e
Wa y Catalyti c Converter . Thes e
thre e system s wor k togethe r t o
contro l th e engine' s combustio n an d
minimiz e th e amoun t o f HC , CO , an d
NO x tha t come s ou t th e tailpipe . Th e
exhaus t emission s contro l system s
ar e separat e fro m th e crankcas e an d
evaporativ e emission s contro l

systems .
PGM-FI
System

Th e PGM-F I Syste m use s sequentia l
multipor t fue l injection .
I t ha s thre e subsystems : Ai r Intake ,
Engin e Control , an d Fue l Control .
Th e Engin e Contro l Modul e (ECM )
o r th e Powertrai n Contro l Modul e
(PCM ) use s variou s sensor s t o
determin e ho w muc h ai r i s goin g
int o th e engine . I t the n control s ho w
muc h fue l t o injec t unde r al l operat -
in g conditions .
Ignition Timing Control System
Thi s syste m constantl y adjust s th e
ignitio n timing , reducin g th e amoun t
o f HC , C O an d NO x produced .
Three Way Catalytic Converter
Th e thre e wa y catalyti c converte r i s
i n th e exhaus t system . Throug h
chemica l reactions , i t convert s HC ,
CO , an d NO x in th e engine' s exhaus t
t o carbo n dioxid e (CO 2) , dinitroge n
(N 2) , an d wate r vapor . Replacemen
t Part s

Th e emission s contro l system s ar e
designe d an d certifie d to wor k to -
gethe r i n reducin g emission s t o
level s tha t compl y wit h th e Clea n Ai r
Act . T o mak e sur e th e emission s

remai n low , yo u shoul d us e onl y ne w
genuin e Hond a replacemen t part s o r

thei r equivalen t fo r repairs . Usin g

lowe r qualit y part s ma y increas e th e

emission s fro m you r vehicle .

Th e emission s contro l system s ar e
covere d b y warrantie s separat e fro m

th e res t o f you r vehicle . Rea d you r

warrant y manua l fo r mor e informa -

tion .
Technica l Informatio n

Thre
e Wa y Catalyti c Converte r

Th e thre e wa y catalyti c converte r
contain s preciou s metal s tha t serv e
a s catalysts , promotin g chemica l
reaction s t o conver t th e exhaus t
gasse s withou t affectin g th e metals .
Th e catalyti c converte r i s referre d t o
a s a three-wa y catalyst , sinc e it act s
o n HC , CO , an d NOx . A replacemen t
uni t mus t b e a n origina l Hond a par t
o r it s equivalent .
Th e thre e wa y catalyti c converte r
mus t operat e a t a hig h temperatur e
fo r th e chemica l reaction s t o tak e
place . I t ca n se t o n fir e an y com -
bustibl e material s tha t com e nea r it .
Par k you r vehicl e awa y fro m hig h
grass , dr y leaves , o r othe r flamma -

bles .
A
defectiv e thre e wa y catalyti c
converte r contribute s t o ai r pollution ,
an d ca n impai r you r engine' s per -
formance . Follo w thes e guideline s t o
protec t you r vehicle' s thre e wa y
catalyti c converter . Alway
s us e unleade d gasoline .
Eve n a smal l amoun t o f leade d
gasolin e ca n contaminat e th e
catalys t metals , makin g th e thre e
wa y catalyti c converte r ineffective . Kee
p th e engin e tuned-up . Hav
e you r vehicl e diagnose d an d
repaire d i f i t i s misfiring , back -
firing , stalling , o r otherwis e no t
runnin g properly .

Technica l Informatio n
THRE
E WA Y CATALYTI C CONVERTE R

Inde
x

Disposa l o f Use d Oil..................... . 214
Door s
Lockin g an d Unlocking.............. . 70
Powe r Doo r Locks...................... . 71
DO T Tir e Qualit y Grading.......... . 296
Downshifting , 5-spee d Manua l
Transmission............................. . 168
Driv e Belts..................................... . 234

Driving........................................... . 163

Economy.................................... . 157
I n Ba d Weather......................... . 180
I n Foreig n Countries................ . 299
Drivin g Guidelines........................ . 164

Economy , Fuel.............................. . 157

Emergencie s o n th e Road............ . 265
Battery , Jum p Starting............. . 276
Brak e Syste m Indicator........... . 284
Changin g a Fla t Tire................ . 266
Chargin g Syste m Indicator..... . 282
Checkin g th e Fuses.................. . 286
Lo w Oi l Pressur e Indicator..... . 281
Malfunctio n Indicato r Lamp... . 283
Overheate d Engine.................. . 279 Emergenc
y Brake........................... . 86
Emergenc y Flashers...................... . 63
Emergenc y Towing...................... . 290
Emissio n Controls........................ . 300

Engin e

Coolan t Temperatur e Gauge ..... 57
Malfunctio n Indicato r
Lamp .................................... 54,
282

Oil Pressur e
Indicator........
. 54 ,
281
Oil , Wha t
Kin
d t o Use.............. . 211
Overheating............................... . 279
Specifications............................ . 294
Starting....................................... . 166
Ethano l i n Gasolin e ...................... . 298
Evaporativ e Emissio n Controls... . 300
Exhaus t Fumes............................... . 49
Expectan t Mothers , Us e o f Sea t
Belt s by........................................ . 19
Exterior , Cleanin g the.................. . 256
Fabric , Cleaning............................ . 260
Fan , Interior..................................... . 98
Features , Comfor t an d
Convenience................................ . 97 Fillin
g th e Fue l Tank.................... . 157
Filter s
Air............................................... . 226
Ai r Conditioning....................... .

234

Oil............................................... . 213

5-spee d Manua l
Transmissio
n
Checkin g Flui d Level............... . 222
Shiftin g the................................ . 169
Flashers , Hazard Warning............. . 63
Fla t Tire , Changin g a................... . 213
Fluid s
Automati c Transmission ...........

221

Brake.......................................... . 224
Clutch......................................... . 224
Manua l Transmission.............. . 222
Powe r
Steering..........................
. 225
Rea r Differential....................... . 223
Windshiel d Washer.................. . 220
F M Stere o Radi o
Reception................................... . 125
Foldin g Rea r Seat........................... . 82
Foreig n Countries , Drivin g in..... . 299
Four-wa y Flashers.......................... . 63
CONTINUED

Inde
x

Jack , Tire....................................... . 266

Jum p Starting................................ . 277

Keys.................................................. . 69
Label , Certification....................... . 292
Lan e Change , Signaling................. . 61
La p Belt............................................ . 43
Lap/Shoulde r Belts........................ . 42
Light s
Bul b Replacement.................... . 246
Indicator....................................... . 53
Parking......................................... . 60
Tur n Signal.................................. . 61
LOC K (Ignitio n Ke y Position)...... . 70
Lock s
Anti-thef t Steerin g Column....... . 70
Fue l Fil l Door............................ . 153
Glov e Box.................................... . 77
Powe r Door................................. . 71
Tailgate........................................ . 7 5
Lo w Coolan t Level........................ . 156 Lo
w Fue l Indicato r ......................... . 57
Lo w Oi l Pressur e Indicator... . 54 , 281
Lubrican t Specification s Chart... . 294
Maintenance.................................. . 197
Owne r Maintenanc e Checks... . 209

Record................................. 207-208

Require d Indicator...................... . 58
Safety.......................................... . 198
Schedule............................. .
202-206

Malfunctio n Indicato r
Lamp.
. 54 , 281
Manua l Transmission................... . 168
Manua l Transmissio n Flui d ........ . 222
Meters , Gauges............................... . 56
Methano l i n Gasoline................... . 282

Mirrors , Adjusting.......................... . 86

Neutra l Gea r Position................... . 172
Ne w Vehicl e Break-i n .................. . 152
Norma l Shif t Speeds..................... . 169
NOTICE , Explanatio n of.................. . ii
Numbers , Identification............... . 292
Octan
e Requirement , Gasoline... . 152

Odometer......................................... . 56

Odometer , Trip............................... . 56

Off-Highwa y Guidelines.............. . 191

Oi l
Change , Ho w to ........................ . 213
Change , Whe n to...................... . 202
Checkin g Engine...................... . 155

Pressur e Indicator.............. . 54 , 281

Selectin g Prope r Viscosit y

Chart...................................... . 212

O N (Ignitio n Ke y Position)........... . 70

Openin g th e Tailgate...................... . 75

Operatio n in Foreig n Countries.. . 299

Outsid e Mirrors.............................. . 86
Over-Drive..................................... . 173
Overheating , Engine.................... . 279

Pain t Touch-up.............................. . 258

Pane l Brightnes s Control.............. . 61
CONTINUED

Inde
x

Syste m Components................... . 42

Us e Durin g Pregnancy............... . 19
Wearin g a Lap/Shoulde r Belt... . 15
Wearin g th e La p Belt................. . 16

Seats , Adjustin g the........................ . 77

Seria l Number............................... . 292
Servic e Intervals........................... . 202
Servic e Manual * ........................... . 311
Servic e Statio n Procedure s ......... . 153
Settin g th e Clock............................ . 87
Shiftin g
Th e 5-spee d Manua l

Transmission......................... . 169

Shif t Leve r Positio n Indicator..... . 170
Shif t Loc k Release........................ . 17 4
Sid e Marke r Lights , Bul b
Replacement.............................. . 247

Signalin g Turns............................... . 61

Sno w Tires..................................... . 240

Solvent-typ e Cleaners................... . 259

Soun d System................................ . 106

Spar k Plugs , Replacing................ . 227

Specification s Charts.................... . 294

Spee d Control.................................. . 66

Speedometer................................... . 56
SRS
, Additiona l Information.......... . 45

Additiona l Safet y Precautions... . 48

Ho w th e Automati c Sea t Bel t

Tensioner s Work.................... . 47

Ho w th e SR S Indicato r Ligh t

Works....................................... . 47

Ho w You r Airbag s Work........... . 45

SR S Components........................ . 45
SR S Service.................................. . 48

SR S Indicator............................ . 47 ,
54

STAR T (Ignitio n
Ke
y Position).... . 70
Startin g th e Engine....................... .

166

I n Col d
Weathe
r a t Hig h
Altitude.................................. .

167

Wit h a
Dea
d Battery................ . 277
Stea m Comin g fro m Engine........ . 27 9
Steerin g Whee l
Adjustment.................................. . 64
Anti-thef t Colum n Lock............. . 70
Stere o Soun d System................... . 106
Storag e Box..................................... . 91
Storin g You r Vehicle.................... . 253
Supplementa l Restrain t System...... . 9
Servic e Precautions.................... . 48
Servicing...................................... . 48

SRS Indicator.............................. .

47

Syste m Components................... . 45

Tensioners ,
Sea
t Belts............... . 47

Syntheti c Oil.................................. . 212

Tachometer..................................... . 56
Tailgat e

Openin g the................................. . 7 5

Ope n Indicator............................ . 55
Taillights , Changin g Bulb s in...... . 248
Takin g Car e o f th e Unexpecte d .. 265
Tap e Playe r .......................... . 112 ,

133

Technica l Description s
Emissio n
Contro
l Systems....... . 284
Thre e Wa y Catalyti c
Converter............................... . 286
Temperatur e Gauge....................... . 57
Tensioners , Sea t Belt s ................... . 47
Tethe r Attachmen t Points............. . 40
Thre e Wa y Catalyti c Converter.. .

304

Time , Settin g
the............................
.

87

Timin g Belt.................................... .
235

Tir e Chains.................................... .
241

CONTINUED