2003 HONDA CIVIC evap

EVAP System
DTC Troubleshooting (cont'd)
8. Check for continuity between EVAP canister purge
valve 2P connenctor terminal No. 2 and body
grou no.
EVAP CANISTER PURGEVALVE 2P CONNECTOR
Wire side of female terminals
ls there continuity?
YES Go to step 9.
NO Replace the EVAP canister purge valve.l
Disconnect ECM connector B (24P).
Check for continuity between EVAP canister purge
valve 2P connector terminal No. 2 and body ground.
EVAP CANISTER PURGEVALVE 2P CONNECTOR
PCS{YEL/BLU)
Wire side of female terminals
ls there continuity?
YES Repair short in the wire between the EVAP
canister purge valve and the ECI\4 {821).1
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
9.
10.
12
'.\'
11-176
v
F-
A973X-041-XXXXX
EVAP Bypass Solenoid Valve Test
1 1 , Disconnect both vacuum hoses from the EVAP two
way valve (A), and connect a vacuum pump to the
canister port on the EVAP two way valve.
Turn the EVAP bypass solenoid valve on with the
Honda PGM Tester, or connect ECM connecter
terminal E20 to body ground with a jumper wire.
ECM CONNECTOR E 131P)
12345617l 189
456/ 1182C21
22t2?24z7l./29
JUMPERWIRE
2WBS(BLU/RED}
13.
14.
Wire side of female terminals
Turn the ignition switch ON (ll).
Apply vacuum to the hose.
Does the valve hold vacuum?
YES-Go to step 15,
NO Go to step 20.

15.
to.
Turn the ignition switch OFF.
Disconnect the EVAP bypass solenoid valve 2P
connecror.
Check for continuity between EVAP bypass
solenoid valve 2P connector terminal No. 2 and
body ground.
17.
EVAP BYPASS SOLENOIDVALVE 2P CONNECTOR
'18.
Wire side oI Iemale terminals
ls there continuity?
YES Go to step 18.
NO-Repair open in the wire bet\iveen the EVAP
bypass solenoid valve and the ECM (E20).1
Turn the ignition switch ON (ll).
2
tG'l
'19. Measure voltage between EVAP bypass solenoid
valve 2P connector terminal No. 1 and body ground.
EVAP BYPASS SOLENOIDVALVE 2P CONNECTOR
{BLK/ORN)
Wire side ol lemale terminals
ls there battery voltage?
YES Replace the EVAP two way/bypass solenoid
valve (A).1
NO-Repair open in the wire between the EVAP
bypass solenoid valve and the No. 4 ACG (10A)
fuse.l
{cont'd)
11-177

EVAP System
DTC Troubleshooting (cont'dl
20. Plug the fueltank port (A) oftheEVAPtwoway
valve,
While monitoring FTP sensor voltage with the
Honda PGM Tester, or measuring the voltage
between ECM connector terminals E4 and E 14,
slowly pump the vacuum pump until the voitage
droDS to about 1.5 volts.
ECM CONNECTOR E {31PI
Wire side of female terminals
Does the voltage dtop to 1.5 V and hold fot at
Ieast 20 seconds?
YES-The EVAP bypass solenoid valve/EVAP two
way valve is OK. Go to step 22.
NO Repair the leak from the EVAP bypass
solenoid valve, EVAP two way valve. or
FTP sensor.l
11-178
Wire side of female terminals
EVAP Canister Vent Shut Valve Test
22. Disconnect the vacuum hose from the EVAP
canister vent filter (A), and connect a vacuum pump
to the hose.
Turn the ignitlon switch ON (ll).
Apply vacuum to the hose with five strokes of the
pump.
Does the valve hold vacuum?
YES Go to step 25.
NO The EVAP canister vent shut valve is OK. Go
to step 30.
Turn the ignition switch OFF.
Disconnect the EVAP canister vent shut valve 2P
conneclor.
Check for continuity between EVAP canister vent
shut valve 2P connector terminal No. 2 and body
ground.
EVAP CANISTEB VENT SHUTVALVE 2P CONNECTOR
{LT GRN/REOI
\
25.
26.
21.

28.
29.
ls thete continuity?
YES-Go to step 28.
NO-Replace the EVAP canister vent shut valve (A)
and o-ring (B).1
Disconnect ECM connector E (31P).
Check for continuity between EVAP canister vent
solenoid valve 2P connector terminal No. 2 and
body ground.
EVAP CANISTER VENT SHUTVALVE 2P CONNECTOR
Wire side o{ female terminals
ls there continuity?
YES-Repair short in the wire between the EVAP
canister vent shut valve and the ECM (E21).1
NO Update the ECM if it does not have the latest
soflware, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
30.
Vacuum Hoses and Connections Test
Do the fuel tank vapor control valve test (see page
1 1-187).
ls the fuel tank vapot control valve OK?
YES-Go to step 31.
NO Replace the fueltank vapor control valve.l
Tighten the fuel cap 3 "clicks", then monitorthe
FTP sensor readings with the Honda PGM Tester.
Start the engine. and let it idle for 5 minutes.
Check the FTP sensor readings.
ls the reading above 0.5 kpa (4 mm Hg, 0.16 in.
Hg) pressure, or about 3 V?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck {see page 1 1-6). lf the symptom/indication
goes away with a known-good ECfvl, replace the
original ECM.t
NO Check the following parts for leaks:l
. Fueltank (A)
. Fuel fill cap (B)
. Fuel fill pipe (C)
. Fueltank vapor control valve(D). Fueltank vapor recirculation valve (E)
. Fueltank vapor recirculation tube (F)
. Fueltank vapor signaltube (G)
. Fueltank vapor control venttube(H). FTP sensor (J)
- Repair or replace any leaking parts.
5t.
11-179

EVAP System
DTC Troubleshooting (cont'd)
DTC Pl457: EVAP Control System(EVAP Canister System)
Leakage
The fuel system is designed to allow specified
maximum vacuum and pressure conditions. Do not
deviate from the vacuum and pressure tests as
indicated in these procedures. Excessive pressure/
vacuum would damage the EVAP components or
cause eventual fuel tank system failure.
SpecialTools Required
Vacuum pump/gauge, 0-30 in.Hg A973X-041-XXXXX
This is a two-trip code. Once cleared, it cannot be
reproduced in one trip. Also, certain specific driving
and ambient conditions must occur before the ECfM will
complete the system checks, Additional test drives may
still not meet the specific conditions needed to16^r^.1' '^6 rh6 ^^.16
Follow these troubleshooting procedures carefully to
ensure the integrity of the system and to confirm the
cause of the problem or code.
NOTE: Fresh fuel has a higher volatility lhat creates
greater pressure/vacuum. The optimum condition for
testing is fresh fuel, and there must be less than a full
tank. lf possible, to assist in leak detection, add I gallon
of fresh fuel to the tank (as long as it will not fill the
tank), just before starting these procedures.
EVAP Canister Purge Valve Test
1. Disconnect the vacuum hose from the EVAP
canister purge valve (A), and connect a vacuumpump to the hose.
11-180
4973X-041-XXXXX
ECM CONNECTOR A I24P'
Wire side of lemale terminals
4.
7.
2. Turn the EVAP canister purge valve on with the
Honda PGM Tester, or connect ECM connector
terminal 821 to body ground with a jumper wire.
Turn the ignition switch ON (ll).
Apply vacuum to the hose.
Does the valve hold vacuum?
YES-Go to step 5.
NO-The EVAP canister purge valve is OK. Go to
step 10.
Turn the ignition switch OFF.
Disconnect the EVAP canister purge valve 2P
conneclor,
Check for continuity between EVAP canister purge
valve 2P connector terminal No. 2 and body ground.
EVAPCANISTEN PURG€VALVE 2P CONNECTOR
-4-
lll2l-fircs
IYEL/8Lu)(f])
I
Wire side offemale lerminals
ls there continuity?
YES-Go to step 8.
NO Repair open in the wire between the EVAP
canister purge valve and the ECM/PCM (821).I
Turn the ignition switch ON (ll).
t
b.
8.

9. Measure voltage between EVAP canister purge
valve 2P connector terminal No. 1 and body ground.
EVAP CANISTER PURGEVALVE 2P CONNECTOR
Wire side oI lemale terminals
ls thete battery voltage?
YES- Replace the EVAP canister purge valve.l
NO Repair open in the wire between the EVAP
canister purge valve and the No.4 ACG (10A)
fuse.I
EVAP Bypass Solenoid Valve Test
10. Disconnect both vacuum hoses from the EVAP two
way valve {A), and connect a vacuum pump to the
canister port on the two way valve.
Turn the ignition switch ON (ll).
Apply vacuum to the hose.
Does the valve hold vacuum?
YES The EVAP two way/bypass solenoid valveis
OK. Go to step 18.
NO-Go to step 13.
Turn the ignition switch OFF.
Disconnect the EVAP bypass solenoid valve 2P
connector.
Check for continuity between EVAP bypass
solenoid valve 2P connector terminal No. 2 and
body ground.
EVAP BYPASS SOLENOIDVALVE 2P CONNECTOR
11.
'It
14.
(cont'd)
11-181
Wire side of female terminals

EVAP System
to.
't7.
DTC Troubleshooting (cont'd)
ls there continuity?
YES Go to step 16.
NO- Replace the EVAP two waylbypass solenoidvalve (A).1
Disconnect ECM connector E {31P).
Check for continuity between EVAP bypass
solenoid valve 2P connector terminal No. 2 and
body ground.
ls there continuity?
YES Repair the short in the wire between theEVAP bypass solenoid valve and the ECM {E20). f
NO Update the ECI\4 if it does not have the latest
software. or substitute a known-good EClvl, thenrecheck (see page 11-6). lf the symptom/indlcationgoes away with a known-good ECM, replace theoriginal ECM.I
EVAP BYPASS SOLENOIDVALVE 2P CONNECTOR
\,
lll2lI t-l2WBS
-[BLU/REo)())
I
Wire side of female terminals
11-182
EVAP Canisler Vent Shut Valve Test
18. Disconnect the vacuum hose from the EVAP
canister vent filter (A), and connect a vacuum pump
to the hose.
19. Turn the EVAP canister vent shut valve on with theHonda PGM Tester, or connect ECM connector
terminal E21 to body ground with a jumper wire.
ECM CONNECTOR E (3TP)
112134589vsv{LT (1/15tal/la2A21
z3lz4zil./m31
JUMPERWIRE
Wire side ol lemale terminals
Turn the ignition switch ON (ll)
Apply vacuum to the hose.
Does the valve hold vacuum?
YES-The EVAP canister vent shut valve is OK. Goto step 27.
NO Go to step 22.
Turn the ignition switch OFF.
Disconnect the EVAP canister vent shut valve 2Pconnector.
GBN/RED)
20.
21.
22.
23.

25.
26.
24. Check for continuity between EVAP canister vent
shutvalve 2Pconnectorterminal No.2 and body
ground.
VATVE 2P CONNECTOR
-4-
lr 2l-T_*u
ILTGFN/REDI
@
wn€ s de ol l€ma1e terminals
ls therc continuity?
YES Go to step 25.
NO Repair open in the wire between the EVAP
canister vent shut valve and the ECIVI (E21).1
Turn the ignition switch oN (ll).
Measure voltage between EVAP canister vent shut
valve 2P connector terminal No. 1 and body ground.
EVAPCANISTER VENT SHUTVALVE 2PCONNECTOR
Wlreside oflem. € rerm na s
ls there battery voltage?
YES Replace the EVAP canister vent shut valve
(A) and the o-ring (B).I
NO Repair open in the wire between the EVAP
canister vent shut valve and the No. 4 ACG (10A)
fuse.I
Canister System Leak Test
27. Turn the ignition switch oFF.
28, Connecttwo, three-way T-fittings (A) intothehose
from the EVAP canister to the EVAP two way valve.
Connect the FTP sensor to one of the T-fittings and
the vacuum pump to the othel
29. Remove the vent hose from the EVAP canister vent
shut valve (A), and cap the port (B) to seal the fresh
air vent of the EVAP canister.
30. Turn the ignition switch ON (ll).
(cont'd)
11-183