Table of Contents
Advertisement
EVAP System
DTC Pl457: EVAP Control
(EVAP Canister Svstem)
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 failure.
Special Tools Bequired
. Vacuum pump/gauge,0 30 in.Hg A973X-041-XXXXX
. V a c u u m / p r e s s u r e g a u g e , 0 4 i n . H g 0 7 J A Z - 0 0 1 0 0 0 8
This is a two-trip code; once cleared, it cannot be
reproduced in one trip. Also, certain specific driving
a n d a m b i e n t c o n d i t i o n s m u s t o c c u r b e f o r e t h e E C M w i l l
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 11
3 8 ) .
Follow these troubleshooting procedures carefully to
ensure the integrity of the system and to confirm the
cause of the Droblem or code.
NOTE: Fresh fuel has a higher volatility that will create
greater pressure/vacuum. The optimum condition for
testing is fresh fuel, at least half. but less than a full tank.
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.
EVAP Canister Pu.ge Valve Test
1. Disconnect the vacuum hose from the EVAP purge
joint (A), and connect a vacuum pump to the hose.
DTC Troubleshooting (cont'dl
11-140
A973X.041-XXXXX
2. Connect ECM connector terminal 46 to bodv
g r o u n d w i t h a j u m p e r w i r e .
ECM CONNECTOR A I32P)
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
T u r n t h e i g n i t i o n s w i t c h O N { l l ) .
A p p l y v a c u u m t o t h e h o s e .
Does the valve hold vacuum?
YES Go to step 5.
NO-The EVAP canister purge valve is OK. Go to
s t e p 1 0 .
Turn the ignition switch OFF.
Disconnect the EVAP canister purge valve 2P
connector.
Check for continuity between EVAP canister purge
v a l v e 2 P c o n n e c t o r t e r m i n a l N o . 2 a n d b o d y g r o u n d .
3 .
4 .
5.
7 .
6.
EVAPCANISTER PURGE
VALVE 2P CONNECfOR
2
o
PCS {RED/YEL}
W i r e s i d e o f i e m a l e t e r m i n a l s
ls there continuity?
YES Go to step 8.
NO Repair open in the wire between the EVAP
c a n i s t e r p u r g e v a l v e a n d t h e E C M ( 4 6 ) . I
Advertisement
Table of Contents
Troubleshooting
