Daewoo CIELO EURO III Manual page 270

1F – 101 ENGINE CONTROLS
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INTERMITTENT LOW
Circuit Description
The Manifold Absolute Pressure (MAP) sensor re-
sponds to changes in intake manifold pressure (vacu-
um). The MAP signal voltage to the
engine control module (ECM) varies
from below 2 volts at idle (high vacuum) to above 4 volts
with the key ON, engine not running or at wide–open
throttle (WOT) (low vacuum).
A "speed density" method of determining engine load is
used. This is calculated using inputs from the MAP sen-
sor, the rpm (58X), and the Intake Air Temperature (IAT)
sensor. The MAP sensor is the main sensor used in this
calculation, and measuring engine load is its main func-
tion.
The MAP sensor is also used to determine manifold
pressure changes while the linear Exhaust Gas Recir-
culation (EGR) flow test diagnostic is being run (refer to
DTC P0401). This determines engine vacuum level for
some other diagnostics and determines Barometric
Pressure (BARO). The ECM compares the MAP
sensor signal to calculated MAP based on Throttle Posi-
tion (TP) and various other engine load factors. If the
ECM detects a MAP signal voltage that is intermit-
tently below the calculated value, DTC P1107 will set.
Conditions for Setting the DTC
No TP sensor fail conditions present.
System voltage is greater than 11 volts.
1.5L SOHC
The MAP is less than 12.0 kPa.
TP sensor is greater than or equal to 0% if rpm is less
than or equal to 1500.
DIAGNOSTIC TROUBLE CODE (DTC) P1107
VOLTAGE
TP sensor is greater than 10.0% if rpm is greater than
1500.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will not illumi-
nate.
The ECM will store conditions which were pres-
ent when the DTC was set as Failure Records data
only. This information will not be stored in the Freeze
Frame data.
A history DTC is stored.
Conditions for Clearing the MIL/DTC
A history DTC will clear after 40 consecutive warm up
cycles without a fault.
DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
Check for the following conditions:
Leaking or plugged vacuum supply line to the MAP
sensor.
Inspect ECM harness connectors for backed-
out terminals, improper mating, broken locks, improp-
erly formed or damaged terminals, and poor
terminal-to-wire connection.
TAA1F140
DAEWOO T-154 BL2,3