Daewoo Nubira User Manual page 516

BPW Bank 1
Indicates the base Pulse Width Modulation (PWM) or ON
time of the indicated cylinder injector in milliseconds.
When the engine load is increased, the injector pulse width
will increase.
Calculated Air Flow
The calculated air flow is a calculation based on manifold
absolute pressure. The calculation is used in several diag-
nostics to determine when to run the diagnostics.
Calculated Load
Indicates engine load based on Manifold Absolute Pres-
sure (MAP). The higher the percentage, the more load the
engine is under.
Camshaft Activity Counter
The Camshaft Position (CMP) activity counter displays
the activity sent to the PCM/ECM from the CMP sensor.
The counter will continually increment while the engine is
running. The CMP activity counter is helpful in diagnosing
DTC P0342.
Desired Idle
The PCM/ECM commands the idle speed. The PCM/ECM
compensates for various engine loads in order to maintain
the desired idle speed. The actual engine speed should re-
main close to the desired idle under the various engine
loads with the engine idling.
Engine Coolant Temperature
The Engine Coolant Temperature (ECT) sensor sends en-
gine temperature information to the PCM/ECM. The PCM/
ECM supplies 5 volts to the engine coolant temperature
sensor circuit. The sensor is a thermistor which changes
internal resistance as temperature changes. When the
sensor is cold (internal resistance high), the PCM/ECM
monitors a high voltage which it interprets as a cold en-
gine. As the sensor warms (internal resistance de-
creases), the voltage signal will decrease and the PCM/
ECM will interpret the lower voltage as a warm engine.
EGR Desired Position
The desired exhaust gas recirculation (EGR) position is
the commanded EGR position. The PCM/ECM calculates
the desired EGR position. The higher the percentage, the
longer the PCM/ECM is commanding the EGR valve ON.
Engine Run Time
The engine run time is a measure of how long the engine
has been running. When the engine stops running, the tim-
er resets to zero.
Engine Speed
Engine Speed is computed by the PCM/ECM from the fuel
control reference input. It should remain close to desired
idle under the various engine loads with the engine idling.
DAEWOO V–121 BL4
ENGINE CONTROLS 1F – 11
EVAP Purge
The Evaporative (EVAP) Emission purge valve solenoid is
a proportional signal used in order to control the EVAP
canister purge function. At 0% the valve is commanded
fully closed. 100% implies that the valve is fully open.
EVAP Purge Solenoid
When energized, the EVAP Emission Canister Purge So-
lenoid allows the fuel vapor to flow from the EVAP Canister
to the engine. The EVAP Emission Canister Purge Sole-
noid is normally closed. The EVAP Emission Canister
Purge Solenoid is pulse width modulated by the PCM/
ECM. The EVAP Emission Canister Purge Solenoid reads
0% when closed and 100% when fully opened.
EVAP Vent Solenoid
The EVAP Emission Vent Solenoid allows fresh outside air
to the EVAP Emission Canister during purge mode. The
EVAP Emission Vent Solenoid allows the diagnostic to pull
a vacuum on the fuel tank by closing the vent solenoid.
Fan
The Fan Control (FC) Relay is commanded by the PCM/
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 Emission Canister Purge Sys-
tem. Several of the Enhanced EVAP Emission Canister
Purge System diagnostics are dependent upon the correct
fuel level.
Fuel Tank Pressure Sensor
The fuel tank pressure sensor measures the difference
between the pressure or the vacuum in the fuel tank and
the outside air pressure. When the air pressure in the fuel
tank equals the outside air pressure, the output voltage of
the sensor is 1.3 to 1.7 volts.
IAC Position
The scan tool displays the PCM/ECM command for the
Idle Air Control (IAC) pintle position in counts. The higher
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 desired idle rpm.
Intake Air Temperature
The PCM/ECM converts the resistance of the Intake Air
emperature (IAT) sensor to degrees in the same manner
as the ECT sensor. Intake air temperature is used by the
PCM/ECM to adjust fuel delivery and spark timing accord-
ing to incoming air density.
Ignition 1 (Voltage)
The ignition volts represent the system voltage measured
y the PCM/ECM at the ignition feed circuit.
Knock Retard
The Knock Sensor (KS) Retard indicates the amount of
park advance the PCM/ECM is decreasing in response o
the KS signal.