On board diagnostics (OBD-II)
Your vehicle is equipped with a computer that monitors the engine’s
emission control system. This system is commonly known as the On
Board Diagnostics System (OBD-II). This OBD-II system protects the
environment by ensuring that your vehicle continues to meet
government emission standards. The OBD-II system also assists your
authorized dealer in properly servicing your vehicle. When the
indicator illuminates, the OBD-II system has detected a malfunction.
Temporary malfunctions may cause your
indicator to illuminate.
Examples are:
1. The vehicle has run out of fuel—the engine may misfire or run poorly.
2. Poor fuel quality or water in the fuel.
3. The fuel cap may not have been securely tightened. SeeFuel filler
capin this chapter.
These temporary malfunctions can be corrected by filling the fuel tank
with good quality fuel and/or properly tightening the fuel cap. After three
driving cycles without these or any other temporary malfunctions
present, the
indicator should turn off—A driving cycle consists of a
cold engine startup followed by mixed city/highway driving. No additional
vehicle service is required.
If the
indicator remains on, have your vehicle serviced at the first
available opportunity.
Readiness for Inspection/Maintenance (I/M) testing
In some localities, it may be a legal requirement to pass an I/M test of
the on-board diagnostics system. If your
indicator is on, refer to
the description in theWarning lights and chimessection of the
Instrument Clusterchapter. Your vehicle may not pass the I/M test with
the
indicator on.
If the vehicle’s powertrain system or its battery has just been serviced,
the on-board diagnostics system is reset to a “not ready for I/M test”
condition. To ready the on-board diagnostics system for I/M testing, a
minimum of 30 minutes of city and highway driving is necessary as
described below:
•First, at least 10 minutes of driving on an expressway or highway.
•Next, at least 20 minutes driving in stop-and-go, city-type traffic with
at least four idle periods.
2006 Expedition(exd)
Owners Guide (post-2002-fmt)
USA(fus)
Maintenance and Specifications
334
recommendations ...................315
refill capacities ........................340
specifications ..................343, 345
Exhaust fumes ..........................237
F
Fail safe cooling ........................323
Floor mats .................................136
Fluid capacities .........................340
Foglamps .....................................94
Four-Wheel Drive vehicles .......253
control trac .............................254
description ..............................254
driving off road .......................257
indicator light .........................254
preparing to drive your
vehicle .....................................247
Fuel ............................................325
calculating fuel
economy ..........................128, 329
cap ...........................................327
capacity ...................................340
choosing the right fuel ...........328
comparisons with EPA fuel
economy estimates .................332
detergent in fuel .....................329
filling your vehicle
with fuel ..................325, 327, 329
filter, specifications ........324, 339
fuel pump shut-off switch .....266
improving fuel economy ........329
octane rating ...........328, 345–346
quality ......................................328
running out of fuel .................329
safety information relating
to automotive fuels ................325
Fuses ..................................268–269G
Garage Door Opener
(see Homelink wireless
control system) .........................119
Gas cap (see Fuel cap) ............327
Gas mileage
(see Fuel economy) .................329
Gauges .........................................16
H
Hazard flashers .........................266
Headlamps ...................................93
aiming ........................................95
autolamp system .......................93
bulb specifications ....................98
daytime running lights .............94
flash to pass ..............................94
high beam .................................93
replacing bulbs .........................99
turning on and off ....................93
Heating
heating and air
conditioning system ...........83, 87
Homelink wireless control
system ........................................119
Hood ..........................................309
I
Ignition .......................235, 345–346
Infant seats
(see Safety seats) .....................191
Inspection/maintenance
(I/M) testing ..............................334
Instrument panel
cleaning ...................................304
cluster ........................................12
2006 Expedition(exd)
Owners Guide (post-2002-fmt)
USA(fus)
Index
355
