1998 ACURA INTEGRA valve

Tssting
1. Check the IAB control valve shaft tor binding or sticking.
2. Check the IAB control valve for smooth movement.
3. With the engine at idle, check that @ of the IAB control valve is in close contact with the stop when vacuum hose isdisconnected.
With the engine at idle. check that @ of the IAB control valve is in close contact with the full-close screw when thevacuum hose is connected.
lf any tault is found, clean the linkage 8nd shafts with carburetor cleaner. lf the problem still exists after cleaning, dis-assemble the intake manifold and check the IAB valve body assembly.
11-137

'il
Emission Gontrol System
Positive Crankcase Ventilation (PCV) System
Description
The Positive Crankcase Ventilation (PCV) system is
designed to prevent blow-by gas from escaping to the
atmosphere. The PCV valve contains a spring-loaded
plunger. When the engine starts. the plunger in the PCV
valve is lifted in orooonion to intake manifold vacuum and
the blow-by gas is drawn directly into the intake manifold.
PCV VALVE
MANIFOLD
+: BLOW-BY VAPOR{-: FRESH AIR
11-140
Inspection
1. Check the PCV hoses and connections for leaks and
croggrng.
BREATHERHOSE
l.--:\
,.r
I
2.At idie, make sure there is a clicking sound from the
PCV valve when the hose between PCV valve and
intake manilold in lightly pinched with your fingers
or plters.
lf there is no clicking sound, check the PCV valve
grommet for cracks and damage. lf the grommet is
OK, reolace the PCV valve and recheck.
Gently pinch here.

Evaporative Emission (EVAP) Controls
,J
a
DescriDtion
The evaporative emission controls are designed to minimize the amount of luel vapor escaping to the atmosphere. Thesystem consists of the following components:
A. EvaporativeEmission lEVAPlControlCanister
An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from theEVAP control canister into the engine and burned.
B. Vapol Purge Control System
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 varve opens anoregulates the flow of fuel vapor to the EVAP control canister.
FrcmNo. 15FUELTANKPRESSURESENSOR
EVAPTHREE WAYVALVE
EVAP CONTROLCANISTENVENT SHUT VALVE
YEL/- BLK
EVAPBYPASSSOLENOIDVALVE
LT GRN
RED/EVAPTWO WAYVALVE
FUEL TANKEVAP VALVE
FUEL TANK
EVAP PURGE CONTROL SOLENOID VALVE DUTY CON-
TROLLED AFTER STARTING ENGINE
?!l ---- 311'AiS-*(7.s Al
FromPGM.FIMAIN RELAY
VARIOUSSENSORS
----<
YEL
EVAP PURGECONTROLSOLENOID VALVE
(cont'd)
-141

Il
1l
Iil
Emission Control SYstem
EVAPrHREEWAYVALVE
tFi4s6l
fPf 45? I
Evaporative Emission {EVAP) Controls (cont'd)
Possible Csuse
. Fuel fill cap
. Vacuum Connections
. FuelTank
. EVAP Control Canister Vent Shut Valve
. EVAP Control Canister Vent Shut Valve Circuit
. EVAP Purge control Solenoid Valve
. EVAP Purge Control Solenoid Valve Circuit
. EVAP Bypass Solenoid Valve
. EVAP Bypass Solenoid Valve Circuit
o FuelTank Pressure Sensor
. Fuel Tank Pressure Sensor Circuit
. EVAP Control Canister
. Throftle Body
Troubloshooling Flowchart
The scan tool indicates Diagnostic Trouble Code {DTC) P1456: Evaporative Emission (EVAP) control system leak
detected (fuel tank system).
ThescantoolindicatesDiagnosticTroubleCode(DTC)P't457:EvaporativeEmission(EVAP)controlsystemleak
detected (EVAP control canister system)'
VACUUMPUMP/GAUGE,0 - 30 in.Bs
A973X - 041 -
xxxxx
EVAP
CANISTER
EVAPCONTROLCANISTERVENTSHUTVALVE
O-RINGReplace.
ECM CONNECTOR A I32P)
(To page 11-147)
- Tho MIL ha3 bcan t6po.tod
on.- DTC P1,t56 or P1457 i! 3toLd.
Chcck the EVAP contiol canittc.
vont shut valva:1. Disconnect the vacuum hose
Irom the EVAP three way
valve and conned a vacuumpump to the hose
2. Remove the EVAP control
canister vent shut valve {rom
the canister.3. Turn the ignition switch ON lll)
4. Apply vacuum to the hose
Chack tor a lhort in tho wire
lVSv linol:Disconnect the 2P conn€ctor from
the EVAP control canister vent
Does the valve hold vacuum?
Rcp.i. ahoft in thc wir. bctw.cn
th6 EVAP conlrol caniator v.nt
3hut valve snd the ECM lA29).Does the valve hold vacuum?
Check tha EVAP coitlol canittcr
vent 3hut valvo:1. Turn the ignition switch OFF
2. Connect ECM connoctor ter'
minal A29 to bodY ground
whh a iumPer wlre
3. Turn the ignition switch ON (ll).
4. Apply vacuum to the hose.
Baplaca tha EVAP control c!ni!'
td vant 3hul Yalvc.
Does the valve hold vacuum?
38t0tl
1215[6'tat92Au232a
2t27a22
VSV {LT GRN) I JUMPER WIRE
Wire side o{ {emale terminals
11-146
{To page 11'147)

(From psge 11-146)
(To page 11-148)
Chack tho vldlum wh.n cold:'1. Disconnscl the vacuum hoseshown from the EVAP controlcanrster ano connect a vacuumgauge to the hose.2. Start the engine and aliow itto idls.NOTE: Engine coolant tem-porat{rre must be below 154"F{68'C} or A/C switch OFF.3. Ouickly raise the engine speedto 3,000 rpm.
lFrom page 11-146)
Check lor an opon in lhe wir€(lG1 lin6l:1. Turn the ignition switch OFF.2. Disconnect the 2P connectorlrom the EVAP control canis-ter vent shut valve.3. Turn the ignition switch ON (ll).
4. Measure voltage between theEVAP control canister vent shutvalve 2P connector terminalNo. 2 and body ground.
Ropair open in the wir6 betweonthe EVAP control canistor v6ntshut valve end the No. 15 ALTER-NATOR SP SENSOR 17.5 Al tu!e.
Ch€ck tor rn op€n in iho wire IVSVline):1. Turn tho ignition switch OFF.2. Reconnect the 2P connectorto the EVAP control canistervent shut valve,3. Turn the ignition switch ON (ll).
4, Measure vo ltage betweenECN/l connector terminals A29and A10.
Repair open in the wire beiwa€nthe EVAP cont.ol cenister ventshut valve and the EcM {4291.ls there baftery vohage?
ReDlacs tho EVAP cont.ol canis"ter vent shut valve.
EVAP CONTROLCANISTER VENT SHUIVALVE 2P CONNECTOR IC224)
.FJ.\1121-T rcl
(D (BLK/YEL)
I
Wire side ot female terminals
ECM CONNECIOR A {32P}
VSV ILT GRNI
Wire side of femaletermtnars
VACUUMPUMP/GAUGE,0 - 30 in.H94973X -
0a1 - xxxxx
(cont'd )
11-147
PG1 (BLKI
rl
4lq-r'rri l12t5t6t?l8r@llzzlzslul
25212a2
__l

Emission Control System
Check the vacuum when hot:1. Turn the ignition switch OFF.2. Block the rear wheels and setthe parking brake.3. Jack up the front of the vehi-cle and support it with safetystands.4- Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on, thenlet it idle.5. Check for vacuum at the vacuum hose with transmissionin gear (A/T in E position,M/T in 'l st gear) after startingrne engrne.6. Ouickly raise the engine speedto 3,000 rpm.
Evaporative Emission (EVAP) Controls (cont'd)
(From page 1'l 147)Check the EVAP purge controlsolenoid valve:1. Disconnect the 2P connectorfrom the EVAP purge controlsolenoid valve.2. Ouickly raise the engine speedto 3,000 rpm.
{To page 11 149)
tfl'I
Check lor a short in the wire{PCS line}l1. Turn the ignition switch OFF.2. Disconnect ECM connector A(32P).
3. Check for continuity betweenthe EVAP purge control solenoid valve 2P connector termi-nal No. 2 (818C5 engine: No. 1)and body ground.
Check for an open in the wire llclline):1. Turn the ignition switch OFF.2, Disconnect the 2P connectorfrom the EVAP purge controlsolenoid valve.3. Turn the ignition switch ON (ll).
4. At the harness side, measurevo ltage between the EVAPpurge controlsolenoid valve 2Pco n nector terminal No. 1( B 18C5 engine: No. 2) andbody ground.
EVAP PURGE CONTROI SOLENOIDVALVE 2P CONNECTOR IC114)B18C1, Cl8Bl engines: 818C5 engine:
PCSIRED/YEL}
femaleWire side offemaleterminals
YES
IGPl{YEL/BLKI
IGPlIYEL/BLKI
ECM CONNECTOR A {32PIPG1IBLKI
Insp€ct vacuum hose routing.lf OK, replace the EVAP purge
control solenoid valve.
neDair short in the wire betweenthe EVAP purge control solenoidvalve and the ECM lAl5).
Substitute a known-90od ECMand recheck. lI symptom/indica-tion goes away, replace the origi-nal ECM.
Repair open in the wirc betweenEVAP purge control solenoidvalve and PGM-FI main relav fuse.ls there battery voltage?
Check for an open in the wireIPCS linel:1. Turn the ignition switch OFF.2. Reconnect the 2P connector tothe EVAP purge control sole'noid valve.3. Turn the ignition switch ON (ll).
4. Measure voltage betweenECM connector terminals A15and A10.
Bopair open in the wiro betweenthe EVAP purgo control 3olanoidvalvo and the EcM {415).
11-144
(To page 11-149)

{From1 1-148)page
v
(From page 11 148)
Substitute a known-good ECMand retest. lf svmplom/indicationgoes away, replace the originalECM,
ECM CONNECTOR A {32PIPG1{8LKI
PCSIRED/YEL)femaletermrnars
Inspect vacuum hose routing.It OK, replace EVAP purge con-trol solenoid valve.
Check the EVAP purge controlsolenoid valve:1. Turn lhe ignition switch OFF.2, Connect the ECM connectorterminals 415 and 410 with a
3. Start the engine and check forvacuum at the vacuum hose.
ls there vacuum?
EVAP TWO WAY
Check the EVAP two way valvelSee EVAP two way valve test (seepage 11 '151).
Replace the EVAP two way valve.
Check the EVAP bypass solenoid
1. Disconnect the vacuum hosefrom the EVAP two way valveand connect a vacuum pumpto the hose.2. Turn the ignition switch ON (lli.
3. Apply vacuum to the hose.
Check lor a short in the wire{2WBS linel:Disconnect the 2P connector fromthe EVAP bypass solenoid valve.
Does valve hold vacuum?
Repair short in tho wire betweenEVAP bypass solonoid valve andrhe ECM {A28).
Does valve hold vacuum?
(cont'd)
{To page 11 150)
11-149

fIr
Emission Control System
Evaporative Emission Controls (cont'dl
t
ECM CONNECTOR A I32PI
JUMPERWIRE
EVAP BYPASS SOLENOIDVALVE 2P CONNECTOB (C793I
tGl(BLK/WHTIWire side of
femaleterminals
\
ECM CONNECTOR A (32PI
PGl (BLKI
Wire side of lem6l6termrnals
(From page 11-149)
Check iho EVAP bypass solanoid
1. Turn the ignitioo switch OFF.2. Connect ECM connector terminal A28 and body ground witha ,umper wrre.3. Turn the ignition switch ON ill).Chock for an opon in the wire(lGr linell1. Turn the ignition switch OFF.2. Disconnect tho 2P connectorfrom the EVAP bypass sole-noid valve.3. Turn the ignition switch ON (ll).
4. Measure voltage between theEVAP bypass solenoid valve2P connector terminal No. 1and body ground.
Does valve hold vacuum?
Roprir opon in tha wiro batwatanEVAP pu.g6 control solcnoid valvcand thc No. 15 ALTERNATOR SPSENSOR {7.5 Al fu3..
Ch6ck tor an opon in the wile
I2WBS lin6l:'L Tlrrn the ignition switch OFF.2. Reconnect the 2P connectorto the EVAP bypass solenoid
3. Turn the ignition switch ON (ll).
4. Measure voltage between ECMconnector terminals A28 andA10.
Check the following parts lorleakage to atmosphere, andrepsir or roplace if n6ce$try:. fuel fill cap. fuel tank' fuel vapor pipe. EVAP two wsy valve. EVAP bvpess solenoid valve. tuel tank ore33urc son3ot. EVAP control canister. EVAP control canist6r veni3hut valve. EVAP purg. control solenoid
. vacuum hoses and conn6ctions
Rcpair opan in thc wira botwa.nth. EVAP byp!.s sobnoid valvc.nd tfi. ECM lA28l.
3Ia10't1
12l61611t8t9dta22a2a
x272tz3
2WBSIBLUI
wire side ol
femal€terminals
1 1-150