Table of Contents
Advertisement
I
l
1l
I
il
Emission Control SYstem
EVAP
rHREE
WAY
VALVE
tFi4s6l
fPf 45? I
Evaporative Emission {EVAP) Controls
(cont'd)
Possible Csuse
. Fuel fill cap
. Vacuum Connections
. F u e l T a n k
. EVAP Control Canister Vent Shut Valve
. EVAP Control Canister Vent Shut Valve Circuit
. EVAP Purge control Solenoid Valve
. EVAP Purge Control Solenoid Valve Circuit
. EVAP Bypass Solenoid Valve
. EVAP Bypass Solenoid Valve Circuit
o FuelTank Pressure Sensor
. Fuel Tank Pressure Sensor Circuit
. EVAP Control Canister
. Throftle Body
Troubloshooling Flowchart
The scan tool indicates Diagnostic Trouble Code {DTC)
P1456: Evaporative Emission (EVAP) control system
leak
detected (fuel tank system).
T h e s c a n t o o l i n d i c a t e s D i a g n o s t i c T r o u b l e C o d e ( D T C ) P ' t 4 5 7 : E v a p o r a t i v e E m i s s i o n ( E V A P ) c o n t r o l s y s t e m l e a
detected (EVAP control canister system)'
VACUUM
PUMP/GAUGE,0
- 30 in.Bs
A973X - 041 -
xxxxx
EVAP
CANISTER
EVAP
CONTROL
CANISTER
VENT
SHUT
VALVE
O-RING
Replace.
ECM CONNECTOR A I32P)
( T o p a g e 1 1 - 1 4 7 )
-
Tho MIL ha3 bcan t6po.tod
on.
-
DTC P1,t56 or P1457 i! 3toLd.
Chcck the EVAP contiol canittc.
vont shut valva:
1. Disconnect the vacuum hose
I r o m t h e E V A P t h r e e w a y
valve and conned a vacuum
pump to the hose
2 . R e m o v e t h e E V A P c o n t r o l
canister vent shut valve {rom
the canister.
3. Turn the ignition switch ON lll)
4. Apply vacuum to the hose
Chack tor a lhort in tho wire
lVSv linol:
Disconnect the 2P conn€ctor from
the EVAP control canister vent
Does the valve hold vacuum?
Rcp.i. ahoft in thc wir. bctw.cn
th6 EVAP conlrol caniator v.nt
3hut valve snd the ECM lA29).
Does the valve hold vacuum?
Check tha EVAP coitlol canittcr
vent 3hut valvo:
1. Turn the ignition switch OFF
2. Connect ECM connoctor ter'
m i n a l A 2 9 t o b o d Y g r o u n d
whh a iumPer wlre
3. Turn the ignition switch ON (ll).
4. Apply vacuum to the hose.
Baplaca tha EVAP control c!ni!'
td vant 3hul Yalvc.
Does the valve hold vacuum?
3
8
t 0
t l
12
1 5 [ 6
'ta
t 9
2A
u
23
2a
2t
27
a
22
VSV {LT GRN)
I
JUMPER WIRE
Wire side o{ {emale terminals
1 1 -1 4 6
{To page 11'147)
Advertisement
Table of Contents
Troubleshooting
