ONBOARD DIAGNOSTIC SYSTEM — OBD II
Your vehicle is equipped with a sophisticated Onboard
Diagnostic system called OBD II. This system monitors
the performance of the emissions, engine, and trans-
mission control systems. When these systems are oper-
ating properly, your vehicle will provide excellent perfor-
mance and fuel economy, as well as engine emissions
well within current government regulations.
If any of these systems require service, the OBD II system
will turn on the Malfunction Indicator Light (MIL). It will
also store diagnostic codes and other information to
assist your service technician in making repairs. Although
your vehicle will usually be drivable and not need towing,
see an authorized dealer for service as soon as possible.
CAUTION!
•
Prolonged driving with the MIL on could cause fur-
ther damage to the emission control system. It
could also affect fuel economy and driveability. The
vehicle must be serviced before any emissions
tests can be performed.
•
If the MIL is flashing while the vehicle is running,
severe catalytic converter damage and power loss
will soon occur. Immediate service is required.
ONBOARD DIAGNOSTIC SYSTEM
(OBD II) CYBERSECURITY
Your vehicle is required to have OBD II and a connection
port to allow access to information related to the perfor-
mance of your emissions controls. Authorized service
technicians may need to access this information to
assist with the diagnosis and service of your vehicle
and emissions system
page 95.
WARNING!
•
ONLY an authorized service technician should con-
nect equipment to the OBD II connection port in
order to read the VIN, diagnose, or service your
vehicle.
•
If unauthorized equipment is connected to the
OBD II connection port, such as a driver-behavior
tracking device, it may:
○
Be possible that vehicle systems, including safety
related systems, could be impaired or a loss of
vehicle control could occur that may result in an
accident involving serious injury or death.
○ Access, or allow others to access, information
stored in your vehicle systems, including per-
sonal information.
EMISSIONS INSPECTION AND
MAINTENANCE PROGRAMS
In some localities, it may be a legal requirement to pass
an inspection of your vehicle's emissions control sys-
tem. Failure to pass could prevent vehicle registration.
For states that require an Inspection and
Maintenance (I/M), this check verifies the
Malfunction Indicator Light (MIL) is function-
ing and is not on when the engine is running,
and that the OBD II system is ready for testing.
Normally, the OBD II system will be ready. The OBD II sys-
tem may not
be ready if your vehicle was recently ser-
viced, recently had a dead battery or a battery replace-
ment. If the OBD II system should be determined not
ready for the I/M test, your vehicle may fail the test.
Your vehicle has a simple ignition actuated test, which
you can use prior to going to the test station.
To check if your vehicle's OBD II system is ready, you
must do the following:
1. Cycle the ignition switch to the ON position, but do
not crank or start the engine.
NOTE:
If you crank or start the engine, you will have to start
this test over.
2.
As soon as you cycle the ignition switch to the ON
position, you will see the Malfunction Indicator Light
(MIL) symbol come on as part of a normal bulb check.
3. Approximately 15 seconds later, one of two things
will happen:
○
The MIL will flash for about 10 seconds and then
return to being fully illuminated until you turn OFF
the ignition or start the engine. This means that
your vehicle's OBD II system is not ready
and you
should not proceed to the I/M station.
○
The MIL will not flash at all and will remain fully
illuminated until you place the ignition in the off
position or start the engine. This means that
your vehicle's OBD II system is ready and you
can proceed to the I/M station.
If your OBD II system is not ready, you should see an
authorized dealer or repair facility. If your vehicle was
recently serviced or had a battery failure or replace-
ment, you may need to do nothing more than drive your
vehicle as you normally would in order for your OBD II
system to update. A recheck with the previously men-
tioned test routine may then indicate that the system is
now ready.
Regardless of whether your vehicle's OBD II system is ready
or not, if the MIL is illuminated during normal vehicle
operation you should have your vehicle serviced before
going to the I/M station. The I/M station can fail your
vehicle because the MIL is on with the engine running.
GETTING TO KNOW YOUR INSTRUMENT PANEL 63
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