Honda NSX-T 1998 Manual page 571

Main Menu
Data
HO2S
Loop status is indicated as "open" or "closed".
Feedback
Closed: Based on the H02S output, the ECM deter-
Loop Status
mines the air/fuel ratio and controls the amount of
(Bank 1: Rear)
injected fuel.
(Bank 2: Front)
Open: Ignoring H02S output, the ECM refers to signals
from the TP, MAP, and ECT sensors to control the
amount of injected fuel.
Short Term
The air/fuel ratio correction coefficient for correcting
Fuel Trim
the amount of injected fuel when HO2S feedback is in
(Bank 1: Rear)
the closed loop status. When the signal from the HO2S
(Bank 2: Front)
is weak, short term fuel trim gets higher, and the ECM
increases the amount of injected fuel. The air/fuel ratio
gradually gets richer, causing a higher H02S output.
Consequently, the short term fuel trim is lowered, and
the ECM reduces the amount of injected fuel. This
cycle keeps the air/fuel ratio close to the stoichiometric
ratio when in closed loop status.
Long Term
Long term fuel trim in computed from short term fuel
Fuel Trim
trim and indicates changes occuring in the fuel supply
(Bank 1: Rear)
system over a long period.
(Bank 2: Front)
If long term fuel trim is higher than 1.00, the amount of
injected fuel must be increased. If it is lower than 1.00,
the amount of injected fuel must be reduced.
Intake Air
The IAT sensor converts intake air temperature into
Temperature voltage and signals the ECM. When intake air tempera-
(IAT) ture is low, the internal resistance of the sensor
increases, and the voltage signal is higher.
Throttle Based on the accelerator pedal position, the opening
Position
angle of the throttle valve is indicated.
Ignition The ignition advance angle is set by the ECM. The ECM
Timing
matches ignition timing to the driving conditions.
Calculated CLV is the engine load calculated from the MAP data.
Load Value
(CLV)
Table of Contents
Description Operating Value
At idle speed: closed
-30%-+43%
-19%-+25%
With cold engine:
Same as ambient temper-
ature and ECT
At idle: Approx. 10%
At full throttle: Approx.
90%
At idle speed: 15 ±2°
BTDC with the SCS service
connector connected.
At idle speed:
15-35%
At 2,500 rpm with no load:
12-30%
Freeze Data
YES
YES
YES
YES
YES
NO
YES