2000 HONDA CIVIC Gauge

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

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)

\
EVAP CONTROLCANISTER VENT SHUTVALVE 2P CONNECTOR IC141I
Wire side of temale terminals
ECM,/PCM CONNECTORS
tG1IBLK/WHT}
A973X -
0/r1 - XXXXX
Wire side of femaletermrnats
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fl
VACUUMPUMP/GAUGE, 0 -30 in.Hg
\(cont'd)
11-289
{From page l1 288}
{To page 11-290)
Ch€ck the vac[um when cold:1, Disconnect the vacuum hoseshown from the EVAP controlcanister and connect a vacuumgauge to the hose.2. Start the engine and allow it
to idle.NOTEi Engine coolant temperature must be below 154"F(68'C) or Ay'C switch OFF.3. Ouickly raise the engine speedto 3,000 rpm.
(From page 11-288)
Check for an open in tha wire(lGt linol:1. Turn the ignition switch OFF.2. Disconnect the 2P connectorfrom the EVAP control canis-ter vent shut valve.3. Turn the ignition switch ON lll).4. Measure voltage between theEVAP control canister vent shut
valve 2P connector terminalNo.2 and bodyground.
Repair open in the wire betweenthe EVAP control canister ventshut valve .nd the No. 15 ALTER-NATOR SP SENSOR {7.5 A)fu3e.
ls there battery voltage?
Ch€d( for an op€n in the wiie IVSVlinel:1. Turn the ignition switch OFF.
2. R€connect the 2P connectorto the EVAP control canistervent shut valve,3. Turn the ignition switch ON (ll).
4. Measure vo ltage betweenECM/PCM connector termi-nals A4 and 82.
Repair open in the wire bctweenthe EVAP control canistor ventshut valve and lhe ECM/PCM{44t.
ls there battery voltage?
Rcolaco tho EVAP control canis.t6r vent shut valvo.
a t32P)
-

IECM/PCM CONNECTOR
I
EVAP TWO WAYVALVE
Wire side oftemaleterminals
FUELTANK
(cont'd)
11-291
tn
VACUUMPUMP/GAUGE,0 - 30 in Hs
A973X - 041 -
xxxxx
(From page l1 290)
Check the EVAP two way valve:
See EVAP two way valve test (see
page 11-295).
Roplace the EVAP two way valve
Check the EVAP bypa$ solenoid
1. Remove the fuel tank (see
page 11-242J.2. LiIt up the fuel tank with a
transmission iack, and connect
the fuel tank pressure sensor
sub harness 6P connector to
the access panel side connec_
tor,3. Disconnect the vacuum hosefrom the EVAP two way valveand connect a vacuum PumPto the hose,4. Turn the ignition switch ON (ll)
5. Apply vacuum to the hose.
(To page 11 292)
(From page 11-290)
Check for an open in the wire
{PCS lin6):1. Turn the ignition switch OFF
2. Reconnect the 2P connector to
the EVAP purge control sole-
3. Turn the ignition switch ON {ll).4. Measu re voltage betweenEClr/PCM connector terminals
A6 and 82.
Ropair open in the wire betweenthe EVAP purge Gontrol solenoidvrlve and th6 ECM/PCM lA6lls there battery voltage?
Substitute a known-good ECM/
PCM rnd re{61. lf symptom/indi'
cation goes away, rePlace the
oiiginal ECM/PCM.

Emission Control System
Evaporative Emission (EVAPI Controls (cont'd)
Evaporative Emission (EVAPI Two Way Valve Testing
l'96 DIGYS engine lcoupel,'97 Dl6Y7 engine (coupe: KL
model, sedan: KL (LX) modoll,'97 Dl6Y8 engine {coup€:
alt models, sedan: KL model, '98-all modelsll:
1. Remove the fuel fill cap.
2. Remove the vapor line from the EVAP two way
valve. and connect it to a T-fitting from a vacuum
gauge and a vacuum pump as shown.
VACUUM/PRESSURE
IJ
f96 D16Y5 engine,'96 D16Y7 engine,'96 D16Y8 ongine
(sedanl,'97 D16Y5 engine,'97 Dl6Y7 engine {coupe: KA,
KC models, sedan: KA, KC, KL {DX} models, hatchback:
all modsls),'97 D16Y8 engine {sedan: KA, KC models}l:
1. Remove the fuel fill cap,
2. Remove the vapor line from the EVAP two way
valve on the fuel tank, and connect it to a T-fitting
from a vacuum gauge and a vacuum pump as
snown.
VACUUM/PRESSURE GAUGE,0 - 4 in.Hg07JAZ - 0010008VACUUMPUMP/GAUGE.0 -30 in.HgA973X-041 -XXXXX
Apply vacuum slowly and continuously while watch-
ing the gauge. The vacuum should stabilize momen-
tarily at 0.8 - 2.1 kPa (6 - 16 mmHg, 0.2 - 0.6 in.Hg).
lf the vacuum stabilizes (valve opens) below
0.8 kPa {6 mmHg, 0.2 in.Hg) or above 2.1 kPa
(16 mmHg, 0.6 in.Hg), install a new valve and retest.
Move the vacuum pump hose from the vacuum fit-
ting to the pressure fitting, and move the vacuum
gauge hose from the vacuum side to the pressure
side as shown.
Slowlv pressurize the vapor line while watching the
gauge. The pressure should be stabilize momentari
ly above 1.0 kPa (8 mmHg. 0.3 in.Hg).
. lf the pressure momentarily stabilizes (valve
opens) above '1.0 kPa (8 mmHg, 0.3 in.Hg), the
valve is OK.
. lf the pressure stabilizes below 1.0 kPa (8 mmHg,
0.3 in.Hg), install a new valve and retest.
Apply vacuum slowly and continuously while
watching the gauge. The vacuum should stabilize
momentarily at 0.7 - 2.0 kPa (5 - 15 mmHg, 0.2 - 0.6
in.Hg ).
lf the vacuum stabilizes (valve opens) below
0.7 kPa (5 mmHg,0.2 in.Hg) or above 2.0 kPa
(15 mmHg, 0.6 in.Hg), install a new valve and retest.
Move the vacuum pump hose from the vacuum fit-
'l'
4.
5.
ting to the pressure fitting, and move the
gauge hose from the vacuum side to the
side as shown.
PRESSURESIDE
Slowly pressurize the vapor line while watching the
gauge. The pressure should stabilize at 1.3 - 4.7 kPa
(0 - 35 mmHg, 0.4 - 1.4 in.Hg).
. It the pressure momentarily stabilizes (valve
opens) at 1.3 - 4.7 kPa (10 - 35 mmHg, 0.4 - 1.4
in. Hg), the valve is OK.
. lf the pressure stabilizes below 1.3 kPa (10 mmHg,
0.4 in.Hg) or above 4.7 kPa (35 mmHg. 1.4 in.Hg),
install a new valve and retest.
vacuum
pressure
GAUGE0- 4 in.Hg
T-FITTINGT-FITTING
11-294
\,

\
Evaporative Emission (EvAPl Two Way Valve T6ting
'99 - 00 modols:
'L Remove the fuel tank (see page 11-242).
2. Remove the vapor line {rom the EVAP two way
valve (located above the EVAP control canister), and
connect it to a T-fitting from vacuum gauge and
vacuum pumo as snown,
VACUUM/PRESSUREGAUGE0 - il in.Hg07JAZ - 001(x)08
ry(L
"*'"""_,";f1
T.FITTING
Apply vacuum slowly and continuously while watch-
ing the gauge.
The vacuum should stabilize momentarily at 0.8 -
2.1 kPa {6 - 16 mmHg, 0.2 - 0.6 in.Hg).
lf the vacuum stabilizes (valve opens) below
0.8 kPa (6 mmHg, 0.2 in.Hg) or above 2.1 kPa
(16 mmHg, 0.6 in.Hg), install a nsw valve and retest.
Move the vacuum pump hose from the vacuum fit-
ting to the pressure fitting, and move the vacuum
gauge hose from the vacuum side to the pressure
side as shown.
GAUGE,0 - 30 in.Hg4973X - (Xl -
xxxxx
J.
5. Slowly pressurize the vapor lin€ while watching the
gauge.
The pressure should be stabilize momentarily
above 1.0 kPa (8 mmHg, 0.3 in.Hg).
. lf the pressure momentarily stabilizes (valve
opens) above 1.0 kPa (8 mmHg, 0.3 in.Hg), the
valve is OK.
. ll the pressure stabilizes below 1.0 kPa (8 mmH9,
0,3 in,Hg), install a new valve and retsst.
(cont'd)
11-295

Emission Gontrol System
Evaporative Emission (EVAP) Controls (cont'dl
ORVR Vent Shut Valve Test
Float Test
1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap to relieve the fuel tank pres-
sure, then reinstall the cap.
3. Remove the fuel hose joint protector. Disconnect
the ORVR vapor recirculation hose, and connect a
vacuum pump to the vapor recirculation hose.
ORVR VAPOERECIRCULATION
VACUUM PUMP/GAUGE,0 - 30 in.H9A973X - 041 -
xxxxx
Plug the hose port.
Apply vacuum to the ORVR vapor recirculation
nose.
. lf the vacuum holds, replace the ORVR vent shut
valve {see page 11-297).
. lf the vacuum does not hold, the float is OK.
4.
11-296
Vatve Tcst
1. Make sure the fueltank is lessthan halffull.
2. Remove the fuel fill cap.
3. Remove the fuel hose joint protector. Disconnect the
ORVR signal hose.
ORVRSIGNALHOSE
Disconnect the vacuum hose from the EVAP control
canister. and then plug the port with a plug.
VACUUMPUMP/GAUGE,0 - 30 in,HgA973X-041-XXXXX
CONTROLCANISTERVENT SHUTVALVE
Disconnect the vacuum hose from the EVAP control
canister vent shut valve, and connect a vacuum pump
to the vacuum hose,
Pump the vacuum pump 80 times.. lf the vacuum holds, go to step 7,. lf thevacuum does not hold, goto step9.

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7. Connect a second vacuum pump to the OBVR signal
nose.
VACUUM PUMP/GAUGE.0 - 30 in.HgA973X - 041 -
xxxxx
Apply vacuum (1 pump) to the ORVR signal hose,
then check the vacuum on the pump in step 6.
. lf the vacuum holds, replace the ORVR vent shut
valve.
. lf the vacuum is released, the ORVR vent shut
valve is OK.
Disconnect the ORVR quick disconnect from the EVAP
canister, then plug the port on the canister.
Reapply vacuum (80 pumps).
. lf the vacuum holds, reDlace the ORVR vent shut
valve,
. lf the vacuum does not hold, inspect the EVAP can-
ister vent shut valve O-ring. lf the O-ring is OK,
replace the EVAP canister and repeat step 4.
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I
11-297
ORVR Vent Shut Valve Replacement
1. Remove the fuel tank (see page 1 1-242).
2. Remove the ORVR vent shut valve from the fuel tank.
3. lnstall oarts in the reverse order of removal.