Equus 3130 - Scan Tool – OBD2 - Manual (Page 22)

20 OBD2
E
Preparation for Testing
BEFORE YOU BEGIN
BEFORE YOU BEGIN
The OBD2 Scan Tool aids in
monitoring electronic- and
emissions-related faults in
your vehicle and retrieving
fault codes related to malfunc-
tions in these systems.
Mechanical problems such as
low oil level or damaged
hoses, wiring or electrical connectors can cause poor engine perform-
ance and may also cause a fault code to set. Fix any known mechan-
ical problems before performing any test. See your vehicle’s service
manual or a mechanic for more information.
Check the following areas before starting any test:
■ Check the engine oil, power steering fluid, transmission fluid (if
applicable), engine coolant and other fluids for proper levels. Top off
low fluid levels if needed.
■ Make sure the air filter is clean and in good condition. Make sure all
air filter ducts are properly connected. Check the air filter ducts for
holes, rips or cracks.
■ Make sure all engine belts are in good condition. Check for cracked,
torn, brittle, loose or missing belts.
■ Make sure mechanical linkages to engine sensors (throttle,
gearshift position, transmission, etc.) are secure and properly con-
nected. See your vehicle’s service manual for locations.
■ Check all rubber hoses (radiator) and steel hoses (vacuum/fuel) for
leaks, cracks, blockage or other damage. Make sure all hoses are
routed and connected properly.
■ Make sure all spark plugs are clean and in good condition. Check
for damaged, loose, disconnected or missing spark plug wires.
■ Make sure the battery terminals are clean and tight. Check for cor-
rosion or broken connections. Check for proper battery and charg-
ing system voltages.
■ Check all electrical wiring and harnesses for proper connection.
Make sure wire insulation is in good condition, and there are no
bare wires.
■ Make sure the engine is mechanically sound. If needed, perform a
compression check, engine vacuum check, timing check (if applica-
ble), etc.