TEST
ACTION
APPLICABILITY
3
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.
Use the Miller Tool #8404 Evaporative Emissions Leak Detector (EELD).
Connect the SMOKE supply tip (black hose) to the service port (if equipped) or
#8404-ADP service adaptor in the filter line.
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: Make sure 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 visible.
Introducing smoke into the filtered side of the canister may assist in
locating the leak.
Was a leak found?
All
Yes
→ Repair or replace the leaking component as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→ Go To 4
4
NOTE: After disconnecting the Evap Purge Solenoid vacuum connections,
inspect the lines and solenoid for any signs of contamination from the EVAP
Canister. This may indicate a faulty rollover valve. Replace/repair as
necessary.
Turn the ignition off.
Disconnect the vacuum hoses at the Evap Purge Solenoid.
Using a hand vacuum pump, apply 10 in Hg to the
9CAN9 side of the EVAP Purge
Solenoid.
NOTE: Monitor the vacuum gauge for at least 15 seconds.
Does the Evap Purge Solenoid hold vacuum?
All
Yes
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→ Replace the Evap Purge Solenoid.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
161
DRIVEABILITY - NGC
P0456-EVAP SYSTEM SMALL LEAK —
Continued