Evap Control System Leakage (Fuel Tank System) - Honda 2002 Accord Manual

DTC PI456; EVAP Control System Leakage
(Fuel Tank System)
1 NOTICE 1
The fuel system is designed to allow specified
m a x i m u m vacuum and pressure conditions. Do not
deviate f r o m the v a c u u m and pressure tests as
indicated in these procedures. Excessive pressure/
v a c u u m w o u l d damage the EVAP components or cause
eventual fuel tank failure
Special Tools Required
V a c u u m 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 ECM/
PCM w i l l complete the system checks. Additional test
drives may still not meet the specific conditions needed
t o reproduce the code.
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 w i l l create
greater pressure/vacuum. The o p t i m u m condition f o r
testing is fresh fuel and less than a full tank of fuel. If
possible, to assist in leak detection, add one 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. Check the fuel fill cap. It must be a gray or black
OEM cap and be tightened at least 3 " c l i c k s " to
properly seal the system.
Is the correct fuel fill cap installed and properly
tightened ?
Y E S G o t o step 2.
NO Replace or tighten the c a p . B
2. Check the fuel fill cap seal.
Is the fuel fill cap seal missing or damaged?
Y E S Replace the fuel fill cap (gray or black
colored cap).B
NO The fuel fill cap is OK. Go t o step 3.
EVAP Bypass Solenoid Valve Test
3. Disconnect the v a c u u m hose f r o m the EVAP t w o -
way valve (A), and connect a vacuum p u m p t o the
hose.
A 9 7 3 X - 0 4 1 - X X X X X
4. With the Honda PGM Tester in the EVAP test m o d e ,
turn on the bypass solenoid, or connect ECM
connector terminal A3 t o body ground w i t h a
jumper w i r e .
E C M / P C M C O N N E C T O R A (32P)
/
2 3 4 5 6
/
8
9 10
12 13 1 4 15
/
17 18 19 20 21 23 24
2 5 26 27 28 29 30 32
2 W B S ( B L U )
J U M P E R W I R E
W i r e s i d e o f f e m a l e t e r m i n a l s
(cont'd)
11-149