8
Please refer to the vehicle’s factory service manual for specific enabling
procedures.
OBDII Drive Cycle
- A specific mode of vehicle operation that provides
conditions required to set all the readiness monitors applicable to the
vehicle to the “ready” condition. The purpose of completing an OBD
II drive cycle is to force the vehicle to run it’s on-board diagnostics.
Some form of a drive cycle needs to be performed after DTCs have
been erased from the PCM’s memory or after the battery has been
disconnected. Running through a vehicle’s complete drive cycle will “set”
the readiness monitors so that future faults can be detected. Drive
cycles vary depending on the vehicle and the monitor that needs
to be reset. For vehicle specific drive cycle, consult the vehicle’s
owner’s manual.
Freeze Frame Data
– When an emissions related fault occurs, the
OBDII system not only sets a code but also records a snapshot of the
vehicle operating parameters to help identify the problem. This set of
values is referred to as Freeze Frame data and may include important
engine parameters such as engine RPM, vehicle speed, air flow, engine
load, fuel pressure, fuel trim value, engine coolant temperature, ignition
timing advance, or closed loop status.
Fuel Trim (FT) -
Feedback adjustments to the base fuel schedule.
Short-term fuel trim refers to dynamic or instantaneous adjustments.
Long-term fuel trim refers to much more gradual adjustments to the fuel
calibration schedule than short-term trim adjustments. These long-term
adjustments compensate for vehicle differences and gradual changes
that occur over time.
2.7 Vehicle Coverage
The code reader is specially designed to work with all OBD II compliant
vehicles, including Control Area Network (CAN). It is required by EPA
that all 1996 and newer vehicles (cars and light trucks) sold in the United
States must be OBD II compliant and this includes all American, Asian
and European vehicles.
A small number of 1994 and 1995 model year gasoline vehicles are
OBD II compliant. To verify if a 1994 or 1995 vehicle is OBD II
compliant, check the Vehicle Emissions Control Information (VECI)
Label, which is located in the engine bay, (typically, by the radiator) of
most vehicles. If the vehicle is OBD II compliant, the label will designate
“OBD II Certified regulations mandate”. For the vehicle to be OBD II
compliant it must have a 16-pin DLC (Data Link Connector) under the
dash and the Vehicle Emission Control Information Label must state that
the vehicle is OBD II compliant.
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