Edelbrock Pro-Tuner, User Manual

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Appendices 227
ECU Engine Control Unit : The electronic “box” that controls the
engine functions. Sometimes referred to as the PCM (Power
train Control Module) or ECS (Engine Control System). Various
manufacturers have a variety of acronyms for the controller.
The Pro-Tuner refers to the ECU specifically as "ECM" for the
48 pin ECU and "PCM" for the 80 pin ECU.
Equivalence Ratio Actual air/fuel ratio divided by the air/fuel ratio at
stoichiometry.
Example: 1.0 would be stoichiometric for the fuel being used
(~14.7:1 for gasoline). 1.1 would represent 10%
Richer, and
0.90 would represent 10% Leaner than stoichiometric.
This is the inverse of Lambda .
Even Row Highlight Feature in the Maps to turn on and off the alternating gray and
white rows. This feature makes cell location easier to
determine.
F
Fault Code The ECU continually monitors sensors and actuators for
possible faults. If you click on the "FAULT" light in the bottom
status bar, a list of fault codes and reasons will be listed.
Fault Code (Active) A fault code that is currently being detected by the ECU. Once
a fault becomes active, it will also be triggered as "Occurred".
Fault Code
(Occurred) A fault code that has occurred since the last time the ignition
key was turned on. It may not be currently Active and may
have been a momentary fault.
Fault Code
(Suspected) A fault code that is "possible" and may become active. The
ECU has detected some intermittent conditions that may be
diagnosed as a marginal or failing component.
Feedback AFR/EqR Air Fuel Ratio (or Equivalency Ratio) as calculated from
readings from the O2 sensor
Flight Recorder Capability that allows for recording chosen parameters for later
review. This differs from
Data Logging by the fact that the
parameters are saved physically in the ECU, thus allowing
recording even without a PC or laptop connected.
Forced Induction An engine that uses a device to force additional air into the
cylinders, such as a turbocharger or supercharger.
G
Gain The ratio of a system's output magnitude to its input
magnitude.
Gain (Differential) This controls the dampening affect of a system. Example:
Increasing the Differential gain for an IAC will control how
much the IAC anticipates a change and how fast it reacts to an
input. The D term deals with the "rate of change" of the
parameter. The faster the parameter is nearing or going away
from set point - the D term output will increase.