2000 HONDA CIVIC Valve

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(From page 11-272)D16Y5 engine:
JUMPER WIRE
D16Y7, D16Y8 engine
VACUUMPUMP/GAUGE,
VACUUMPUMP/GAUGE,0 - 30 in.HgAs73x - 0il1 -
xxxxx
0 - 30 in.HgA973X -
otl -
xxxxx
I
EVAP CONTROLCANISTER
ECM/PCM CONNECTOH D I32PI
VACUUM/PBESSUREGAUGE0-4in.Hg07JAZ - 0010008
Wire side otfemale terminals
D16Y7, Dl6Y8 engine:
t
VACUUM/PRESSUREGAUGE0-4 in.Hgo?JAZ - 001fl)OB(cont'd)
11-273
PGl IBLKI
Check lhe EVAP Purge control
solsnoid valve:
1. Disconnect the vacuum hose
from the EVAP controlcanister'
2. Connect the vacuum PumP to
the hose and aPPIY vacuum
Does it hold vacuum?
Check the EVAP control canister:
1. Reconnect the vacuum hose to
the EVAP control canlster.
2. Connect the vacuum/Pressuregaugeto the Purge aar hose
3. Connect ECM/PCM connector
terminals A15 and A10 with a
iumper wire.4. Start the engine5. Check the vacuum
Check the EVAP two way valve(see page 11-193)
Does the EVAP two waY valveReplace the EVAP two wsY valve.
Sub3titute a known-good ECM/
PCM .nd recheck. lt symPtom/
indicrtion go6s away, rePlace the
original ECM/PCM.
D16Y5 sngin€:

Emission Control System
Evaporative Emission (EVAP) Gontrols (cont'd)
'99 - 0O models only:
The scan tool indicates Diagnostic Trouble Code (DTC) P0451: The Fuel Tank Pressure sensor circuit range/oerformance Droblem.
ECM/PCM CONNECTORS
wire side ot femare terminars sG2 IGRN/BLK)
FUEL TANKPRESSURESENSOR
VACUUMPUMP/GAUGE,0 - 30 in.Hg
FUEL TANKPRESSURE SENSORASSEMBLY
EVAP TWOWAY VALVE
IJ
tl'
Ths MIL has been reDortgd on.DTC m/$1 i3 stored.
Check the tuel tank pros3ure ser|-sor:1. Do the ECM/PCM Reset Proce-dure.2. Remove the tuellill cap.3. Turn the ignition switch ON (ll).4. N4onitor the FTP Sensor volt-age with the Honda PGMTester, or measure voltagebetween body ground andECN4/PCM connector terminalsA29 and C18.
ls there approx. 2.5 V7
Check tho tuel tank pressure !on-soa:1. Remove the fuel tank (seepage 11 2421.2. Remove the fuel tank pres-sure sensor assembly fromthe fueltank.3. Connect the fuel tank PressureSensor sub-harness 6P con-nector to the access panelside connector,4. Disconnect the hose betweenthe EVAP two way valvg andthe fuel tank pressure sensor atthe EVAP two way valve end.5. Connect a vacuum pump tothe open end ofthat hose.6. Turn the ignition switch ON (ll).7. Monitor the FTP Sensor volt,age with the Honda PGMTester, or measure voltagebetween ECM/PCM connectorterminals A29 and C18, andcarefully pump vacuum on thehose one stroke at a time.8. The voltage sho!ld smoothlydrop from the stading approx.2.5 V down to approx. '1.5 V.STOP applying vacuum whenthe voltage drops to approx. 1.5V or damage to the fuel tankpressure sensor may occur.
Does the voltage drop toapprox. 1.5 V and hold?
Sub3titute a known-good ECM/PCM and r6check. It symptom/indicltion 90e3 aw.y, replac\. th€original ECM/PCM.
A (32P)
A973X - 041 -
xxxxx
11-274

\
t,96 D16Y8 engine (coup6l,'9? Dl6Y7 engine (coupe: KL model, sedan: KL (LX) model)"g7 Dl6Y8 ongine (coupe: all mod-
els, sedan: KL model,'98-8ll modelsl 39 - 00 Dl5Y5 engine with M/Tl:
The scan tool indicates Diagnostic Trouble code (DTc) P1456: Evaporative Emission (EVAP) control system leak
detected (fuel tank sYsteml
The scan tool indicates Diagnostic Trouble Code (DTC) P1457: Evaporative Emission (EVAP) control system leak
detected (EVAP control canister system).
Fr4t6l
fF14s7
Possible Causs
. Fuel fill cap
. Vacuum Connections
. Fuel Tank
. 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
. Fuel Tank Pressure Sensor
. Fuel Tank Pressure Sensor Circuit
. EVAP Control Canister
. Throttle Body
Troublsshooting Flowchart
VACUUMPUMP/GAUGE,0 - 30 in.HgA973X - 041 -
xxxxx
I
EVAPCONTROL
.4, cANrsrER
re ./ VALVE
{S----r*::n
\(cont'd)
- The MIL ha3 been rePofted
on.- DTC P1456 or P1457 is stored.
Check the EVAP control canbtol
vent shut valve:1. Disconnect the vacuum hose
Irom the EVAP three waY
valve and connect a vacuurnpump to the hose.
2. Remove the EVAP control
canister vent shut valve Irofi
the canrster.3. Turn the ignition switch ON (lli
4. Apply vacuum to the hose.
Chock for . shon in the wire(VSv linel:Disconnect the 2P connector {rom
the EVAP control canister vent
Does the valve hold vacuum?
Repair short in the wir€ betwcen
the EVAP control canister vent
shut v.lve and tho ECM/PCM
tA29|.
Does the valve hold vacuum?
Check the EVAP control canister
vent shui valve:1. Turn the ignition switch OFF.
2. Connect ECM/PCM connectorterminal A29 to body ground
with a iumPer wire.
3. Turn the ignition switch ON (ll).
4. Applyvacuum to the hose
Reohce the EVAP control canis-
ter vent shttt valve.
Does the valve hold vacuum?
ECM/PCM CONNECTOR A {32P)
37I9t01t't2t3t5t6ItItt9202a2a
25aA
ILT GRN/W{T) I JUMPER WIRE
Wire side of femll terminals
(To page 11-284i(To page 11 284)
11-283

Emission Control System
Evaporative Emission (EVAPI Controls (cont'dl
1
EVAP CONTROLCANISTER VENT SHUTVALVE 2P CONNECTOR IC141}
lltrt+ rcl
o) (8LK/YErl
I
temale terminalsWire side ot
ECM/PCM CONNECTOR A (32PI
VSV ILT GRN/WHT}
'l'
Wiro side of lemaletgrminals
VACUUMPUMP/GAUGE,0 - 30 in.Hg4973X -
041 - XXXXX
(From page 1l-283)
{To page 1l-285}
Check the vacuum whon cold:1. Disconnect the vacuum hoseshown from the EVAP controlcanrster and connect a vacuumgauge to the hose,2. Start the engine and allow itto idle.NOTE: Engine coolant tem-perature must be below 154oF(68'C) or lVC switch OFF.3. Ouickly raise the engine speedto 3,000 rpm.
(From page l1-283)
Check for an open in tho wire(lGl line):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 controlcanister vent shutvalve 2P connector terminalNo. 2 and body ground.
Repair open in the wire betwe€nthe EVAP control c.ni3tei ventshut valve and th6 No. 15 ALTER-NATOR SP SENSOR 17.5 Al fuse.
Cfisck tor an opon in the wire (VSVline):1. Turn the ignition switch OFF.2. Beconnect the 2P connectorto the EVAP control canistervent shut valve.3. Turn the ignition switch ON (ll).4. Measure voltage betweenECM/PCM connector termi-nals A29 and Al0.
Rep.ir open in the wire betwoonthe EVAP control canister ventshut valve and th€ ECM/PCMtA29t.
ls there battery voltage?
Replace th6 EVAP control canis-ter vent 3hut valve.
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25
11-284

\
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(From page 11-284)
\(cont'd)
11-285
EVAP PURGE CONTROL SOI.INOID
VALVE 2P CONNECTOR IC114I
Wire side otfemaleterminals
?,
I,l,lil?"",,,u
EL,TWYEL)
Check the EVAP pirrge controlsolenoid valvei1. Disconnect the 2P connector
lrom the EVAP purge control
solenoid valve.
2. Ouickly raise the engine speed
to 3,000 rpm.
ls there vacuum?
InsDect vacuum ho56 routing.ll OK, replace the EVAP Purgecontrol solenoid valve.
Chock for a short in the wire(PCS linel:1. Turn the ignition switch OFF
2. Disconnect ECM/PCM connec'
tor A (32Pi.
3. Check for continuity between
the EVAP PUrge control sole
noid valve 2P connector termi
nal No.2 and body ground.
Check the vacuum when hot:
1. Turn the ignition switch OFF
2. Block the rear wheels and set
the parking brake.3. Jack up the front o{ the vehi-
cle and support it with safety
stands,4. Start the engine. Hold the
engine al 3,000 rpm wlth no
load (in Park or neutral) until
the radiator fan comes on, then
let it idle.5, Check for vacuum at the vac-
uum hose with transmissaonin gear (A/T in B Position,M/T in lst gear) after starting
the engrne.6. Ouickly raise the engine speed
to 3,000 rpm.
Reoair short in the wire botween
the EVAP purg€ cor|t]ol solenoid
valve and the ECM/pcM lA15l.ls there continuity?
Substitute a known-good ECM/
PCM and recheck. lf sYmPtom/indication goes eway. repl.c€ the
original ECM/PCM.
Check the EVAP Purg€ control
solenoid valve:1. Turn the ignition switch OFF
2. Disconnect the 2P connector
from the EVAP Purge control
solenoid valve and warm lt
up to normal operating tem_perature again if necessary
3. Stan the engine.4. At the harness side, measure
voltage between the EVAP
Purge control solenoid valve
2P connector terminal No. 1
and No. 2 with the transmission in gear (A,/T in E Posi-tion, M/T in 1st gear).
In3pect vacuum ho3€ touting.
ll OK, replace EVAP Purge con-
lrol aolenoid vtlv€.
Check lo. an open in the wire
llGl linel:At the harness side, measure volt
age between the EVAP Purge con-
trol solenoid valve 2P connectorterminal No. 1 and body groundRepeir open in tho wire between
EVAP purge conttol solenoid valv€
and the No. 15 ALTERNATOR SP
SENSOR (7.5 A fu3e
IBLK/YELI
lTo page 11 286i(To page 11-286)

Emission Control System
(From page 11 285)
Check lor an op€n in the wire{PCS line}:1. Turn the ignition switch OFF.2, Reconnect the 2P connector lothe EVAP purge control sole-noid valve.3. Turn the ignition switch ON (lll.4. Measure vo ltage betweenECM/PCM connector terminals415 and A]0.
Repai. op€n in the wire bGtweenthe EVAP purge control solenoidvalve and the ECM/PCM {A151.
Substitute a known-good ECM/PCM and retest. tf sympiom/indi-cation goes away, replac6 theoriginal ECM/PCM.
Evaporative Emission (EVAPI Controls (cont'd)
(From page 11'285)
(To page 'l1 287)
\.
ECM/PCM CONNECTOR A {32P}
PCS{RED/YEL)
PGl
{BLK)
Wire side oftemaleterminals
EVAP BYPASSSOLENOID VALVE
O.RINGBeplace.
PUMP/GAUGE,0 - 30 in.HgA973X -
041 -
xxxxx
EVAP TWO WAY VALVE
EVAP IWO WAY
Check the EVAP two way valvo:See EVAP two way valve test (seepage 11'294).
Replace tho EVAP two way valve.
Check the EVAP bypr$ 3olenoid
1. Disconnect the vacuum hosefrom the EVAP two way valveand connect a vacuum pumpto the hose.2. Turn the ignition switch ON lll).3. Apply vacuum to the hose.Check tor a short in the wire{2WBS linel:Disconnect the 2P connector fromthe EVAP bypass solenoid valve.Does the valve hold vacuum?
Repair short in the wire betwe€nEVAP bypass sol€noid valve andrhe ECM/PCM lA28).
Does the valve hold vacuum?
11-286

I
ECM/PCM CONNECTOR A (32P)
2WBS(BLUIWiro side olIemaleterminalsJUMPER _
WIRE
EVAP BYPASS SOLENOIDVALVE 2P CONNECTOR {C793I
Wire side of
femal€terminals
\
ECM/P,CM CONNECTOR a l32Pl
Wir€ side of femaleterminals
(cont'dl
11-2A7
(From page 11-286)
Check the EVAP bypa3s 3olenoid
1. Turn the ignition switch OFF.
2. Connect ECM/PCM connectorterminal A28 and body ground
with a jumper wire.3. Turn the ignition switch ON (ll).ChGck tor an opon in lho wite(lGl lin6l:1. Turn the ignition switch OFF
2. Disconnect the 2P connectortrom the EVAP bypass sole-noid valve.3. Turn the ignition switch ON (ll).
4. Measure voltage between the
EVAP bypass solenoid valve
2P connector terminal No- 1
and body ground.
R.pair open in tha wil€ botwoonEVAP purg. cor|trol 3olenoid valve
.nd tho No. 15 ALTERNATOR SP
SENSOR 17.5 Al tu3e.
Check lor an open in the wire
{2WBS line):l. Turn the ignition switch OFF.
2. Reconnsct the 2P connectorto the EVAP bypass solenoid
3. Turn the ignition switch ON (ll)
4. Measure voltage between
ECM/rcM connector terminalsA28 and Al0.
Ch6ck the following P..ts for
l6akage to atmosPhere, and
roplir or rephco if neca3aary:' fuel fill c.D. tu6l t.nk. tuel vapor pipe. EVAP two way v3lvo. EVAP bypa3! solanoid vtlY., fuel tlnk pra63uro 3on3or. EVAP control canBte.. EVAP control crnistor vent
shut vtlvo. EVAP purgo control lolonoid
. vscuum hoseS and connoction3
Roprir opon in tho wiro betwoen
th. EVAP byp.$ 3ol6noid valve
rnd tho EcM/PcM lA28l.ls there battery voltage?
I2578t011'12tt15t6t8t9202321
2726293o
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Ent ll4al*l 4 l,-'l
2WaS {BLUI
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Emission Control System
Evaporative Emission {EVAP) Controls (cont'dl
\J
tF1456-l
tP14sz-l
EVAPCONTROLCANISTERVENTSHUTVALVE
O.RINGReplace.
EVAPCONTROLCANISTER
ECM/PCM CONNECTOR A I32PI
(To page 11'289)
'99 - 00 modols except Dl6Y5 engine with M/T:
The scan tool indicates Diagnostic Trouble Code (DTC) P1456: Evaporative Emission (EVAP) control system leak
detected (fuel tank svstem).
The scan tool indicates Diagnostic Trouble Code (DTC) P1457: Evaporative Emission (EVAP) control system leak
detected (EVAP control canister system).
Possible Cause
. Fuel fill cap
. Vacuum Connections
. FuelTank
. EVAP Control Canister Vent Shut Valve
. EVAP Control Canister Vent Shut Valve Circuit
. EVAP Purge Control Solenoid Valve
o EVAP Purge Control Solenoid Valve Circuit
. EVAP Bypass Solenoid Valve
0 -30 in,Hg
. EVAP Bypass Solenoid Valve Circuit
. Fuel Tank Pressure Sensor
. Fuel Tank Pressure Sensor Circuir
. EVAP Control Canister
. ORVR vent shut valve
. ORVR vapor recirculation valve
. Throttle Body
Troubleshooting Flowchart
VACUUMPUMP/GAUGE,A973X - oal -
xxxxx
T-t
t\
The MIL has been reported on.DTC P1456 o. P1457 is stored.
Check the EVAP cont.ol canistervent shul valve:1. Disconnect the vacuum hosefrom the EVAP three wayvalve and connect a vacuumpump to the hose.2. Remove the EVAP controlcanister vent shut valve fromtne canrster.3. Turn the ignition switch ON (ll).
4. Apply vacuum to the hose.Check for a short in the wiro(VSV linel:Disconnect the 2P connector fromthe EVAP control canister ventDoes the vaive hold vacuum?
RoDair 3hort in the wire botwe€nthe EVAP control canilter ventshut valve and the ECM/PCM{A4t.
Does the valve hold vacuum?Check the EVAP cont.ol canisterv€nl shut valve:1. Turn the ignition switch OFF.2. Connect ECM/PCM connectorterminal A4 to body groundwith a jumper wire.3. Turn the ignition switch ON (ll).
4. Apply vacuum to the hose.
Reolace the EVAP control canis-ter veni shut valve.
Does the valve hold vacuum?
Wire side of female terminals
11-288
lTo page 11-289)