P0446 = Evaporative Emission Control / System Vent Control Circuit
Malfunction.
Check it, and before you replace the Evap Canister read this:
Subject: DTC
P0446 (Restricted/Blocked EVAP Vent Path) Set, Service Engine Soon (SES)
Lamp Illuminated (Replace Hose/Evaporative Emission (EVAP) Canister
Vent Asm) #02-06-04-037A - (02/02/2005)
Models: 1999-2003 Chevrolet
Silverado Models
1999-2003 GMC Sierra Models
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This
bulletin is being revised to add model years. Please discard Corporate
Bulletin Number 02-06-04-037 (Section 06 -- Engine/Propulsion System).
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Condition
Some
customers whose vehicles are operated in dusty type environments, such
as farming or mining off-road type applications, may comment about the
illumination of the instrument panel SES light, with a DTC of P0446
(Restricted/Blocked EVAP Vent Path) being set.
Cause
Dirt
and dust intrusion into the EVAP canister vent hose assembly, resulting
in restricted air flow, may cause this condition.
Correction
After
following the Service Manual diagnostic P0446 and determining that the
EVAP canister vent valve is the cause of the SES light, replace the
existing EVAP canister vent hose assembly with a new assembly, P/N
15086429. This new assembly has an enhanced filtering capability and a
filter element that can be easily removed and cleaned. To ensure correct
installation, follow the procedure below.
Raise the vehicle.
Suitably support the vehicle.
Disconnect the EVAP canister vent
valve electrical connector.
Disconnect the vent valve pipe at the
EVAP canister.
Remove and retain the EVAP canister vent valve
bracket mounting bolt.
Disengage, from the underbody, the two vent
valve pipe clips securing the pipe to the underbody.
Remove and
discard the complete EVAP canister vent hose assembly.
Position and
secure the new assembly to the underbody using the existing hole and
mounting bolt.
Tighten
Tighten the bracket mounting bolt to 12
N·m (106 lb in).
Install the two vent valve pipe clips into the
existing underbody holes.
Connect the vent valve pipe to the EVAP
canister.
Connect the EVAP canister vent valve electrical connector.
Lower the vehicle.
When properly installed, the new EVAP
canister vent hose assembly will be positioned outboard of the original
installation location. This new location provides clearance for
accessing the filter element for cleaning purposes. To access the filter
element, disengage the filter cover to valve locking finger by gently
lifting the finger upward while simultaneously rotating the filter body
clockwise. After approximately 45 degrees of rotation, the filter can be
disengaged from the valve by gently pulling outward. The filter cover
can then be removed and the filter element and body can be washed with
soap and water. Prior to reinstalling, ensure that the body and filter
element are dry.
Parts Information
Part Number 15086429
Hose Asm-Evap Emis Cnstr Vent
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