Daewoo CIELO EURO III Manual page 175

decreases), the voltage signal will decrease and the
ECM will interpret the lower voltage as a warm en-
gine.
EGR Desired Position
The desired exhaust gas recirculation (EGR) position is
the commanded EGR position. The ECM calcu-
lates the desired EGR position. The higher the percent-
age, the longer the ECM is commanding the EGR
valve ON.
Engine Load
Indicates engine load based on manifold absolute pres-
sure. The higher the percentage, the more load the en-
gine is under.
Engine Run Time
The engine run time is a measure of how long the engine
has been running. When the engine stops running, the
timer resets to zero.
Engine Speed
Engine Speed is computed by the ECM from the
fuel control reference input. It should remain close to de-
sired idle under the various engine loads with the engine
idling.
Fan
The Fan Control (FC) Relay is commanded by the
ECM. The FC Relay displays the command as ON or
OFF.
Fuel Level Sensor
The Fuel Level Sensor monitors the fuel level in the
tank. The Fuel Level Sensor monitors the rate of change
of the air pressure in the EVAP system. Several of the
Enhanced EVAP System diagnostics are dependent
upon the correct fuel level.
Fuel System Status
The Closed Loop is displayed indicating that the
ECM is controlling the fuel delivery according to the Ox-
ygen Sensor (O2S 1) voltage as close to an air/fuel ratio
of 14.7 to 1 as possible.
IAC Position
The scan tool displays the ECM command for the
Idle Air Control (IAC) pintle position in counts. The high-
er the number of counts, the greater the commanded
idle speed reads. The Idle Air Control responds to
changes in the engine load in order to maintain the de-
sired idle rpm.
Ignition 1 (Voltage)
The ignition volts represent the system voltage mea-
sured by the ECM at the ignition feed circuit.
Intake Air Temperature
The ECM converts the resistance of the Intake Air
Temperature (IAT) sensor to degrees in the same man-
ner as the engine coolant temperature (ECT) sensor. In-
DAEWOO T-154 BL2,3
ENGINE CONTROLS 1F – 7
take air temperature is used by the ECM to adjust
fuel delivery and spark timing according to incoming air
density.
Knock Present
The KS Noise Channel indicates when the ECM
detects the KS signal. The ECM should display
NO at idle.
Long Term FT
The Long Term Fuel Trim (FT) is derived from the short
term fuel trim value. The Long Term FT is used for the
long term correction of the fuel delivery. A value of
128 counts (0%) indicates that the fuel delivery requires
no compensation in order to maintain a 14.7:1 air to fuel
ratio. A value below 128 counts means that the fuel sys-
tem is too rich and the fuel delivery is being reduced.
The ECM is decreasing the injector pulse width. A
value above 128 counts indicates that a lean condition
exists for which the ECM is compensating.
MAP
The Manifold Absolute Pressure (MAP) sensor mea-
sures the change in the intake manifold pressure which
results from engine load and speed changes. As the in-
take manifold pressure increases, the air density in the
intake also increases and the additional fuel is required.
Misfire History #1-4
Indicates the number of misfires that have occurred af-
ter 195 current misfires have been counted. The current
misfire counter will add its misfires to the history misfire
counter after 195 total misfires have taken place. If
1 cylinder is misfiring, the misfiring current counter will
have 195 misfires counted before adding to its history
counter. If 2 cylinders are misfiring, the misfiring current
counter will add to their history counters after 97 mis-
fires. The counter increments only after a misfire diag-
nostic trouble code (DTC) has been set.
Oxygen Sensor Bank 1 Sensor 1
The pre-converter Oxygen Sensor (O2S 1) reading rep-
resents the exhaust oxygen sensor output voltage. This
voltage will fluctuate constantly between 100 mv (lean
exhaust) and 900 mv (rich exhaust) when the system is
operating in a Closed Loop.
Oxygen Sensor Bank 1 Sensor 2
The post-converter Heated Oxygen Sensor (HO2S 2)
represents the exhaust oxygen output voltage past the
catalytic converter. This voltage remains inactive, or the
voltage will appear lazy within a range of 100 mv (lean
exhaust) and 900 mv (rich exhaust) when operating in a
Closed Loop.
Short Term FT
The Short Term FT represents a short term correction to
fuel delivery by the ECM in response to the
amount of time the oxygen sensor voltage spends
above or below the 450 mv threshold. If the oxygen sen-