Equus 3150 - ABS/SRS + OBD2 Diagnostic Tool - Manual (Page 34)

Preparation for Testing
BEFORE YOU BEGIN
32 OBD2
BEFORE YOU BEGIN
The Enhanced OBD2 Code
Reader aids in monitoring elec-
tronic- and emissions-related
faults in your vehicle and retriev-
ing fault codes related to mal-
functions in these systems.
Mechanical problems such as
low oil level or damaged hoses, wiring or electrical connectors can
cause poor engine performance and may also cause a fault code to set.
Fix any known mechanical 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 connected. 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
corrosion or broken connections. Check for proper battery and
charging 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.