Dtc Pl456: Evap Control System Leakage (Fuel Tank System); Fuel Fill Cap Check; Evap Canister Purge Valve Test - Honda S2000 Service Manual

DTC Pl456: EVAP Control System
(Fuel Tank Svstem)
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 failure.
Special Tools Required
V a c u u m P u m p / G a u g e , 0 - 3 0 i n . H g A 9 7 3 X - 0 4 1 - X X X X X
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 ECM will
complate the system checks. additional test drives may
still not meet the specific conditions needed to
reproduce the code. lf necessary. use the test drive
procedures for setting the readiness code (see page l1-
3 8 ) .
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 that will create
greater pressure/vacuum. The optimum condition for
testing is fresh fuel, and must be less than a full tank of
gas. lf possible, to assist in leak detection, add 1 gallon
of fresh fuel to the tank {as long as it will not fill the
tank), just before starting these procedures.
Fuel Fill Cap Check
1 . C h e c k t h e f u e l f i l l c a p ( t h e c a p m u s t s a y " l f n o t
tightened 3 clicks check engine light may come
o n " ) .
ls the proper tuel fill cap installed and properly
tightened?
YES Go to step 2.
NO Replace or tighten the cap.l
2 . C h e c k t h e f u e l f i l l c a p s e a l .
Is the fuel fill cap seal missing or damaged?
YES Replace the fuel fill cap (gray or black
c o l o r e d c a p ) . 1
N O T h e f u e l f i l l c a p i s O K . G o t o s t e p 3 ,
5 .
7 .
EVAP Canister Purge Valve Test
3. Disconnect the vacuum hose from the EVAP purge
joint (A), and connect a vacuum pump to the hose.
A973X-041-XXXXX
Turn the ignition switch ON (ll).
Apply vacuum to the hose.
Does the valve hold vacuum?
YES-The EVAP canister purge valve is OK. Go to
s t e p 1 2 .
NO Go to step 6.
Turn the ignition switch OFF.
Disconnect the EVAP canister purge valve 2P
conneclor.
(cont'd)
1 1 - 1 3 5