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DRIVEABILITY - NGC
P0440-GENERAL EVAP SYSTEM FAILURE —
TEST
7
NOTE: A thorough visual inspection of the Evap system hoses, tubes, and
connections may save time in your diagnosis. Look for any physical damage
or signs of wetness at connections. The strong smell of fuel vapors may aid
diagnosis also.
To continue testing, you will need Miller Tool #8404 Evaporative Emissions Leak
Detector (EELD).
Remove the Air supply hose from the service port.
Connect the SMOKE supply tip (black hose) to the service port.
Set the smoke/air control switch to SMOKE.
NOTE: The flow meter indicator ball will not move at this point.
Press the remote smoke/air start button.
NOTE: Ensure that smoke has filled the EVAP system by continuing to press
the remote smoke/air start button, remove the vehicle fuel cap, and wait for
the smoke to exit. Once smoke is indicated reinstall the fuel cap.
NOTE: For optimal performance, introduce smoke into the system for an
additional 60 seconds; continue introducing smoke at 15 second intervals,
as necessary.
While still holding the remote smoke/air start button, use the white light (#8404-
CLL) to follow the EVAP system path, and look for the source of the leak indicated by
exiting smoke.
If a leak is concealed from view (i.e., top of fuel tank), release the remote smoke/air
start button, and use the ultraviolet (UV) black light #8404-UVL and the yellow
goggles 8404-20 to look for residual traces of dye that are left behind by the smoke.
The exiting smoke deposits a residual fluid that is either bright green or bright
yellow in color when viewed with a UV light.
NOTE: Carefully inspect the vent side of the EVAP Canister. Due to the
filtering system in the canister the smoke or dye may or may not be visual.
Introducing smoke into the filtered side of the canister may assist in
locating the leak.
Was a leak found?
Yes → Repair or replace the leaking component as necessary.
→ NOTE: Before continuing, check the PCM harness connector
No
8
Turn the ignition off.
Disconnect the NVLD electrical harness connector.
Check connectors - Clean/repair as necessary.
Using a jumper wire, jumper across the (K107) NVLD Switch Sense circuit and the
(Z1) Ground circuit in the NVLD electrical harness connector.
Monitor the NVLD Switch state on the DRBIII .
Does the Switch change from OPEN to CLOSED.
Yes → Replace the NVLD Assembly.
→ Go To 9
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 6 - NGC.
terminals for corrosion, damage or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Continued
164
APPLICABILITY
All
All
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