Manifold Absolute Pressure Check - Daewoo CIELO EURO III Manual

1F – 60 ENGINE CONTROLS
Circuit Description
The Manifold Absolute Pressure (MAP) sensor mea-
sures the changes in the intake manifold pressure which
result from engine load (intake manifold vacuum) and
rpm changes. The MAP sensor converts these changes
into a voltage output. The engine control module
(ECM) sends a 5-volt reference voltage to the
MAP sensor. As the intake manifold pressure changes,
the output voltage of the MAP sensor also changes.
A low voltage (high vacuum) output of 1 to 2 volts is
present at idle. A high voltage (low vacuum)
output of 4.0 to 4.8 volts is present at wide
open throttle. The MAP sensor is also used under cer-
tain conditions to measure barometric pressure. This al-
lows the ECM to make adjustments for altitude

MANIFOLD ABSOLUTE PRESSURE CHECK

changes. The ECM uses the MAP sensor for fuel
delivery and ignition timing changes.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
2. Applying 34 kPa (10 inches Hg) of vacuum to the
MAP sensor should cause the voltage to change.
Subtract the second voltage reading from the first.
That voltage value should be more than 1.5 volts.
When applying vacuum to the MAP sensor, the
change in the voltage should happen instantly. A
slow voltage change indicates a faulty MAP sensor.
3. Disconnect the MAP sensor from the bracket and
twist the MAP sensor. Output changes more than
0.1 volt indicate a faulty connector or connection.
TAA1F140
DAEWOO T-154 BL2,3