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P0442-EVAP SYSTEM MEDIUM LEAK —
TEST
4
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 in the smoke mode.
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 is 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 may not be as thick. 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.
No
5
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 CAN of the EVAP Purge
Solenoid.
NOTE: Monitor the vacuum gauge for at least 15 seconds.
Does the EVAP Purge Solenoid hold vacuum?
Yes → Go To 6
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 6 - NGC.
→ Go To 5
→ Replace the Evap Purge Solenoid.
Perform POWERTRAIN VERIFICATION TEST VER - 6 - NGC.
DRIVEABILITY - NGC
Continued
171
APPLICABILITY
All
All
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