User Manual

NexLink NL102PLUS User Manual

repairs are completed or the condition no longer exists.

DTC

-- Diagnostic Trouble Codes (DTC) that identifies which section of the

emission control system has malfunctioned.

Enabling Criteria

-- Also termed Enabling Conditions. They are the

vehicle-specific events or conditions that must occur within the engine before

the various monitors will set, or run. Some monitors require the vehicle to follow

a prescribed “drive cycle” routine as part of the enabling criteria. Drive cycles

vary among vehicles and for each monitor in any particular vehicle. Please refer

to the vehicle’s factory service manual for specific enabling procedures.

OBD II 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 its onboard 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 service manual.

Freeze Frame Data

-- When an emissions related fault occurs, the OBD II

system not only sets a code but also records a snapshot of the vehicle

operating parameters to help in identifying 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.

2.5 DPF Reset/Regen.

DPF Reset/Regen.

– Regeneration is the process of removing the

accumulated soot from the filter. This is done either passively (from the engine’s