Daewoo CIELO EURO III Manual page 264

1F – 95 ENGINE CONTROLS
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INTERMITTENT HIGH
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 in the ON position, 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 the 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 and various other engine load factors. If the
ECM detects a MAP signal voltage that is intermittently
above the calculated value, DTC P1106 will set.
Conditions for Setting the DTC
No TP sensor fail conditions present.
Engine running time is greater than 10 seconds.
1.5L SOHC
The MAP is greater than 103.0 kPa.
TP sensor is less than 20% if rpm is less than 3000.
TP sensor is less than 30% if rpm is greater than
3000.
DIAGNOSTIC TROUBLE CODE (DTC) P1106
VOLTAGE
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.
Inspect the wiring harness for damage. If the harness
appears to be OK, observe the MAP display on the
scan tool while moving connectors and wiring har-
nesses related to the sensor. A change in the display
will indicate the location of the fault.
TAA1F140
DAEWOO T-154 BL2,3