NGS Mach II User Guide v1.1
EVAP Testing
29
5. Select
PRESELECT FOR EVAP TEST
then
press
TRIGGER
.
PRESELECT FOR PATS
PRESELECT FOR POWER BA/CYL KILL
PRESELECT FOR EVAP TEST
SELECT ITEM AND PRESS TRIGGER TO START
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6. When prompted reselect the following
(press
TRIGGER
after each selection):
• SELECT NEW VEHICLE YEAR & MODEL
• Select model year
• Select vehicle and engine
• Confirm selection
4. Select
EVAP TEST
then press
TRIGGER
.
EVAP TEST
SELECT ITEM AND PRESS TRIGGER TO START
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NGS Mach II displays this screen:
-START ENGINE, DO NOT PRESS THROTTLE
-FUEL LEVEL MUST BE BETWEEN 15% & 85%
-CLEAR DTCS AT END OF TEST. FOR MANUAL
-TRANSMISSION VEH: IF TEST ABORTS,
-HOLD CLUTCH PEDAL DOWN DURING TEST
TRIGGER TO CONTINUE
5. After starting the vehicle, press
TRIGGER
to continue.
6. NGS runs a series of checks on the vehicle
before beginning the test. Press
TRIGGER
when prompted to continue to the test
.
7. NGS runs the following tests:
Bleed down test
—Creates a vacuum in
the system and then pulls it down to a
preset level. If the EVAP system cannot
pull a vacuum down to the preset level, it
indicates a leak is present.
Bleed up test
—Seals the system under
vacuum and monitors the system for any
bleed up or vacuum decay. If the system
bleeds up too quickly, a vapor generation
test is started to determine if fuel vapor
expansion is the cause of the bleed up.
Canister vent valve test
—Tests the valve
to see if it will vent the vacuum.
NGS displays the results as a PASS or a
FAIL.
8. When the tests are completed, press
CANCEL
to exit the test.
9. After completing the test, check and clear
any DTCs that may have been generated.
