Iat sensor HONDA CR-V 2000 RD1-RD3 / 1.G Workshop Manual

22. Remove the radiator caP.
!@ use care when removing the radiatol
cap to avoid scalding by hot coolani or steam.
23. Raise the hoist to full height
24. Remove the front tires/wheels.
25. Remove the guard bar and splash shield.
8 x 1.25 mm2,1 N.m {2.4 kgf,m, 17 lbl ft)6x1.0mm9.8 N.m {1.0 kgf.m, GUARD BAR7.2 tbf.rr)
Loosen the drain plug in the radiator. Drain the
engine coolant (see page 10-51.
Drain the transmission oil or fluid. Reinstall the drain
plug using a new washer lsee section 13 (M/T) or sec-
tion 14 (ly'T)].
Drain the engine oil. Reinstall the drain bolt using a
new washer {see page 8-4).
Bemove the A,/C compressor. Do not disconnect the
!y'C hoses.
SPLASH
26.
27.
28.
29.
ER
lCEB
30. Disconnect the primary heated oxygen sensor (prl-
mary HO2S) connector. then remove exhaust pipe A
'97 - 98 U.S. models (Cslifornia):
PRIMARY HO2SCONNECTOR
GASKETReplace.
SELF-LOCKING NUT8 x 1.25 mm22 N.m 12.2 kgf.m,16 lbf.ftlReplace.
8 x 1.25 mm16 N.m {1.6 kgf.m.12 tbt.ftlReplace.
SELF.LOCKING NUT10 x 1.25 mm54 N.m 15.5 kgf.m,.() tbf.frlReplace.
NUT
'97 - 98 U.S. mod€ls {Except California):'99 - 00 models:
PRIMARY HO2SCONNECTORGASKETSReplace.
GASKETReplace.
SELF.LOCKING8 x 'l.25 mm22 N.m (2.2 kgf m,
16 rbf.ftlReplace.
SELF.LOCKING NUT
8 x 1.25 mm16 N.m 11.6 kgf.m,12 tbt fr)Replace.
10 x 1.25 mm54 N.m 15.5 kgt.m,40 rbt.ftlReplace.
{cont'd)
5-7
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13. Remove the upper radiator hose, heater hose and
water bypass hose.
WATER BYPASS
UPPEBRADIATORHOSE
17
HEATERHOSE
Remove the engine wire harness connectors and
wire harness clamps from the cylinder head and the
intake manifold.
o Four fuel injector connectors
. Engine coolant temperature (ECT) sensor con-
neclor
. Radiator fan switch connector
. Coolant temperature gauge sendlng unlt connec-
tor
. Throttle position sensor connector
. Manifold absolute pressure {MAP) sensor con-
nector
Primary heated oxygen sensor (primary HO2S)
connector
ldle air control (lAC) valve connector
Distributor connector
Remove the spark plug caps and distributor from the
cylinder head.
Remove the cruise control actuator (see section 4).
Support the engine with a jack, then remove the
upper bracket. Make sure to place a cushion
between the oil pan and the iack (see page 6-10).
a
18. Remove the cylinder head cover.
19. Inspect the timing belt (see page 6-9).
CYLINDER
(cont'd)
6-19
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Intake Manifold
Replacement
NOTE:
. Use new O-rings and gaskets when reassembling.
. Check for folds or scratches on the surface of the gasket.
. Replace with a new gasket if damaged.
'97 - 98 models:
INTAK€ MANIFOLDReplace if cracked orif mating surfaces areoamageo,
INTAKE AIRTEMPERATURE
{IATI SENSOR22 N.n 12.2 kgl.m,16 rbf.ftl
8 x 1.25 mm22 N.m 12.2 kgtm.'t6 tbf ft)
8 x 1.25 mm22 N.m |.2.2 kgl.rn,'16 tbt ftl
I x 1.25 mm24 N m 12.4 kgf m.17 tbf.ft)
INTAKBRAC}
INTAKE MANIFOLOBRACKET B ('98 modell8 x 1.25 mm23 N m (2.3 kgt m,17 tbf.ftlI x 1.25 mm24 N.m 12.4 kgf.m,17 tbf.ft)
8 x 1.25 mm24 N.m (2.4 kgf.m,17 tbf.ft)
9-2
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'99 - O0 modol3:
6x1.0mm9.8 N.m 11.0 kg{.m,7.2 tbtltl
NESONATOR
6x1.0mm9.8 N.m {1.0 kgf.m,7.2 rbr.ftt
O-RINGReplace.Apply oil to O-RINGbetore installing.
RESONATORCHAMBERBRACKET
GASKETReplace.
IAT SENSOR2:2N.m l2.2kgl.n,16 tbtftl
O.RINGReplace.
l
O.RINGReplace.
8 x 1.25 mm24 N.m 12.4 kgt m,17 tbt frl
INTAKE MANIFOLDReplace it cracked orif mating surfaces areoamageo.
8 x 1.25 mm22 N.m 12.2 kgl.m,16 rbf.ftt
IAC VALVE
8 x 1.25 mm23 N.m (2.3 kgf.m,17 tbf.ft,
INTAKE MANIFOLD
22 N.m 12,2 kgl.m,16 rbfftl
("\"- K\*}Gt
W\qu u
N,1\J 'n\
.a,,-\\J "
G)s
BRACKET
9-3
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Water Pump
lllustrated Index
ENGINE COOLANTTEMPERATURE IECTISENSOR18 N.m 11,8 kgt.m,13 tbt.ftl
COOLANTTEMPERATUREGAUGEUNIT
6x1.0mm9.8 N'm (1.0 kgf.m,7.2 tbt frl
9 N.m {0.3 kgf.m,7 tbf.fttApply liquid gasketto the threads.
WATER OUTLETCOVERApply liquid gasker part No.087'18 - 0001 or 08718 - 0003to the mating surface.
RADIATOR FAN SWITCH2il N.m (2.i1 kgl.m,17 tbfft)
WATER PUMPlnspection, page 10-11
O-RINGReplac€.
6xl,0mm12 N.tn n.2 lgl.rn,8.7 tbf'ft)
CONNECTINGPIPE
6x1.0mm12 N.m 11.2 kgf.m,8.7 tbtftl
10-10
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Component Locations
lndex
'97 - 98 models:
MANIFOLD ABSOLUTEPRESSURE IMAP} SENSORTroubleshooting, Page 1 1-90
THROTTLE POSITION (TP}
SENSORTroubleshooting, page 1 1-103
toLE AtR CONTROL llAcl VAI-VE
Troubleshooting, page 1 1-152
EVAPORATIVE EMISSION (EVAP)
CONTROL CANISTER VENT SHUTVALVE t'98 mod€llTroubleshooting, page 11'213
INTAKE AIR TEMPERATUREIIATI SENSORTroubleshooting. page 1 'l -95
ELECTRICAL LOADDETECTOR IELD) (USA modol)Troubleshooting, page 1 1-138
VEHICLE SPEEDSENSOR (VSS)
Troubleshooting,page 11'135
CRANKSHAFTPOSTTtON/
POWER STEERING PRESSURElPsPl swtrcHTroubloshooting, page 1 1-162
TOP OEAD CENTER/CYLINDERPOStTtON{CKP/TDC/CYP} SENSOR(Built into the distributor)Troubleshooting, page 1 l-131
CMNKSHAFT SPEEDFLUCTUATION ICKF} SENSORTroubleshooting. page 1'!-142
ENGINE COOLANTTEMPERATUREIECTI SENSORTroubleshooting, page 11 99
EVAPORATIVEI€VAP) PURGE CONTROLSOLENOID VALVETroubf eshooting, page 1 1'2o5, 213
(cont'd)
11-3
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Component Locations
Index (cont'dl
39 - 00 models:
MANIFOLD ABSOLUTEPRESSURE IMAPISENSORTroubleshooting, page 1 1-90
THROTTLE POSITION {TP)SENSORTroubleshooting, page 1 1-103
IDLE AIR CONTROL OACI VALVETroubleshooting, page 1 1-152
EVAPOBATIVE EMISSION {EVAPICONTROL CANISTER VENT SHUTVALVETroubleshooting, page 1 1-213
EVAPORATIVE EMISSION(EVAPI PURGE CONTROI-SOLENOID VALVETroubleshootang, page 1 1-2'13
ELECTRICAL LOAOOETECTOR {ELD) IUSA modet)Troubleshooting, page I 1-138
INTAKE AIR TEMPERATURE(IAT) SENSORTroubleshooting, page 11 95
POWEB STEERING PRESSUREtPsPt swtTcHTroubleshooting, page 11 162VEHICLE SPEEDSENSOR IVSSITroubleshooting,page 11'135
CRANKSHAFTPOSTTTON/TOP OEAD CENTER/CYLINDERPOStTtON{CKP/TDC/CYP) SENSOR(Built into the distributor)Troubleshooting, page 11 131
CRANKSHAFT SPEEDFLUCTUATION ICKN SENSORTroubleshooting, page 1 1-142
SENSORTroubleshooting, page '11 130
ENGINE COOLANTTEMPERATURE{ECT)SENSORTroubleshooting, page 11 99
11-4
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System Description
I
I
I
Vacuum Connections (cont'dl
'98 model:
C PRIMARY HEATEO OXYGEN SENSOR (PRIMARY HO2S,
SENSOR 1)(, SECONDARY HEATEO OXYGEN SENSOR ISECONDARYHO2S, SENSOR 2)(!)\\\\ss\SNBSS\\\ETRESS\RE\\NQ\SE\SSR
G) ENGINE COOLANT TEMPERATUBE (ECT) SENSOR
O INTAKE AIR TEMPERATURE {IAT} SENSOR
@ CRANKSHAFT SPEED FLUCTUATION (CKFI SENSOR
O IDLE AIR CONTROL (IAC) VALVE
@ FAST IDLE THERMO VALVE (A/T)
O THROTTLE BODY (TBI(0) FUEL INJECTOR.1' FUEL PULSATION DAMPER.14 FUEL FILTER(i FUEL PRESSURE REGULATOR14 FUEL PUMP(D FUEL TANK@ FUEL TANK EVAPORATIVE EMISSION {EVAPI VALVE
C] AIR CLEANER(O RESONATOR1iC POSITIVE CRANKCASE VENTILATION (PCV) VALVE
6 \$REE$IN gN NL$\C CON\ER\ER (TNC\
ti q rpos,xr E qN
ssros \E aP cqN\RoLcaNtsr€R
@ EVAPORATIVE EMISSION IEVAP) PURGE CONTROL
SOLENOID VALVEq3 EVAPORATIVE EMISSTON IEVAP} CONTROL CANISTER
VENT SHUT VALVE
@ EVAPORATIVE EMISSION (EVAP) TWO WAY VALVE
€i EVAPORATIVE EMISSION {EVAP) BYPASS SOLENOID
VALVE
€9 FUEL TANK PRESSURE SENSOROi EVAPORATIVE EMISSION {EVAP) THREE WAY VALVE
Qd PURGE JOINT
G/T only)
f
-i*'";-t
COOLANT Jt
U
11-12
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System Description
Vacuum Connections (cont'dl
'99 - q) models:
ENGINECOOLANT
t
o
o
o@
o@@@@@@@@@(t
PRIMARY HEATED OXYGEN SENSOR IPRIMARY HO2S,SENSOR 1lSECONDARY HEATED OXYGEN SENSOR {SECONDARYHO2S. SENSOR 2lMANIFOLD ABSOLUTE PRESSURE (MAPI SENSORENGINE COOLANT TEMPERATURE IECN SENSORINTAKE AIR TEMPERATURE IIATI SENSORCRANKSHAFT SPEED FLUCTUATION {CKF) SENSORKNOCK SENSOR (KS}
IDLE AIR CONTROL IIACI VALVEFAST IDLE THERMO VALVE {A/T}THROTTLE BODY (TB}
FUEL INJECTORFUEL PULSATION DAMPERFUEL FILTERFUEL PRESSURE REGULATORFUEL PUMPFUEL TANKFUEL TANK EVAPORATIVE EMISSION (EVAPI VALVE
AIR CLEANERRESONATORPOSITIVE CRANKCASE VENTILATION (PCV} VALVETHREE WAY CATALYTIC CONVERTER ITWCIEVAPORATIVE EMISSION {EVAPI CONTROL CANISTEREVAPORATIVE EMISSION IEVAPI PURGE CONTROLSOLENOID VALVEEVAPORATIVE EMISSION {EVAPI CONTROL CANISTEFVENT SHUT VALVEEVAPORATIVE EMISSION IEVAPI TWO WAY VALVEEVAPONANVE EMISSION {EVAPI AYPASS SOLENOIDVALVEFUEL TANK PRESSURE SENSOBEVAPORATIVE EMISSION IEVAPI THREE WAY VALVEPURGE JOINT
@@@@@@
@
@@
@@@
11-14
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ECM/PCM Data
By connecting the OBD ll scan tool or the Honda PGM Tester to the 16P data link connector (OLC), various data can be
retrieved from the ECM/PCM. The items listed in the table below conform to the SAE recommended practice
The Honda PGM Tester also reads data beyond that recommended by SAE.
understanding this data will help to find the causes of intermittent failures or engine problems.
NOTE:
The ',operating values" given below are approximate values and may be different depending on the environment and
the individual vehicle.
Unless noted otherwise. "at idle speed" means idling with the engine completely warmed up, transmission in position
Park or neutral and the A,./C and all accessories turned otf.
DataDesc.iptionOp€rating ValuoFreeze Data
Diagnostic
Trouble Code
(DTC)
lf the ECM/PCM detects a problem, it will store it as a
code consisting of one letter and tour numbers
Depending on the problem, an SAE-defined code (Poxxx)
or a Honda-defined code (P'lxxx) will be output to the
tester.
lf no problem is detected,
there is no output.
YES
Engine SpeedThe ECN4/PCN4 computes engine speed from the signals
sent from the Crankshaft Position sensor.
This data is used for determining the time and amount of
fuel iniection.
Nearly the same as
tachometer indication
At idle speed:'97 - 98 models:
750 t 50 rpm'99 - 00 models:
730 f 50 rpm
YES
Vehicle SpeedThe ECM/PCM converts pulse signals from the Vehicle
Speed Sensor (VSSI into speed data.
Nearly the same as
speedometer indicationYES
Manifold
Absolute
Pressure (MAP)
The absolute pressure caused in the intake manifold by
engine load and speed.
With engin6 stopped:
Nearly the same as atmo-
spheric pressure
At idle speed:
2a - 41 kPa {210 - 310
mmHg, 8.3 - 12.2 inHg)
YES
Engine Coolant
Temperature
{ECT)
The ECT sensor converts coolant temperature into volt-
age and signals the ECM/PCM. The sensor is a thermistor
whose internal resistance changes with coolant tempera-
ture. The ECM/PCM uses the voltage signals from the
ECT sensor to determine the amount of injected fuel
With cold engine:
Same as ambient temPer-
ature and IAT
With engine warmed uP:
approx. 163 - 2'12'F
(73 - 100"c)
YES
Heated Oxygen
Sensor (HO25)
(Primary,
Sensor 1)
(Secondary
Sensor 2)
The Heated Oxygen Sensor detects the oxygen content in
the exhaust gas and sends voltage signals to the
ECMiPCM. Based on these signals, the ECM/PCM controls
the airlfuel ratio. When the oxygen content is high (that is.
when the ratio is leaner than the stoichiometric ratio), the
voltage signal is lower.
When the orygen content is low (that is, when the ratio
is richer than the stoichiometric ratio), the voltage signal
is higher.
0.0 - 1.25 V
At idle speed:
about 0.1 - 0.9
NO
(cont'd)
1 1-65
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