2006 DODGE RAM SRT-10 sensor

REMOVAL
3.7L V-6
The intake manifold air temperature (IAT) sensor is
installed into the left side of intake manifold plenum.
1. Disconnect electrical connector from IAT sensor.
2. Clean dirt from intake manifold at sensor base.
3. Gently lift on small plastic release tab (3) and
rotate sensor about 1/4 turn counterclockwise for
removal.
4. Check condition of sensor O-ring.

4.7L V-8
The intake manifold air temperature (IAT) sensor (3) is
installed into the left side of intake manifold plenum.
1. Disconnect electrical connector from IAT sensor.
2. Clean dirt from intake manifold at sensor base.
3. Gently lift on small plastic release tab (3) and
rotate sensor about 1/4 turn counterclockwise for
removal.
4. Check condition of sensor O-ring.

5.7L V-8
The intake manifold air temperature (IAT) sensor (2) is
installed into the front of the intake manifold air box
plenum.
1. Disconnect electrical connector (2) from IAT sensor.
2. Clean dirt from intake manifold at sensor base.

3. Gently lift on small plastic release tab (3) and
rotate sensor about 1/4 turn counterclockwise for
removal.
4. Check condition of sensor O-ring.
INSTALLATION
3.7L V-6
The intake manifold air temperature (IAT) sensor (1) is
installed into the left side of intake manifold plenum.
1. Check condition of sensor O-ring.
2. Clean sensor mounting hole in intake manifold.
3. Position sensor into intake manifold and rotate
clockwise until past release tab (2).
4. Install electrical connector.

4.7L V-8
The intake manifold air temperature (IAT) sensor (3) is
installed into the left side of intake manifold plenum.
1. Check condition of sensor O-ring.
2. Clean sensor mounting hole in intake manifold.
3. Position sensor into intake manifold and rotate
clockwise until past release tab.
4. Install electrical connector.
5.7L V-8
The intake manifold air temperature (IAT) sensor (2) is
installed into the front of the intake manifold air box
plenum.
1. Check condition of sensor O-ring.
2. Clean sensor mounting hole in intake manifold.
3. Position sensor into intake manifold and rotate
clockwise until past release tab.
4. Install electrical connector.

SENSOR-MAP
DESCRIPTION
3.7L V-6
The Manifold Absolute Pressure (MAP) sensor (2) is
mounted into the front of the intake manifold with 2
screws.
4.7L V-8
The Manifold Absolute Pressure (MAP) sensor (1) is
mounted into the front of the intake manifold with 2
screws.

5.7L V-8
The Manifold Absolute Pressure (MAP) sensor is
mounted to the front of the intake manifold air plenum
box.
8.3L - SRT-10
The MAP sensor (2) mounts to the drivers side intake
manifold plenum.
OPERATION
The MAP sensor is used as an input to the Powertrain Control Module (PCM). Itcontains a silicon based sensing
unit to provide data on the manifold vacuum that draws the air/fuel mixtureinto the combustion chamber. The PCM
requires this information to determine injector pulse width and spark advance. When manifold absolute pressure
(MAP) equals Barometric pressure, the pulse width will be at maximum.
A 5 volt reference is supplied from the PCM and returns a voltage signal to the PCM that reflects manifold pressure.
The zero pressure reading is 0.5V and full scale is 4.5V. For a pressure swing of 0–15 psi, the voltage changes
4.0V. To operate the sensor, it is supplied a regulated 4.8 to 5.1 volts. Ground is provided through the low-noise,
sensor return circuit at the PCM.
The MAP sensor input is the number one contributor to fuel injector pulse width. The most important function of the
MAP sensor is to determine barometric pressure. The PCM needs to know if thevehicle is at sea level or at a

higher altitude, because the air density changes with altitude. It will also help to correct for varying barometric pres-
sure. Barometric pressure and altitude have a direct inverse correlation; as altitude goes up, barometric goes down.
At key-on, the PCM powers up and looks at MAP voltage, and based upon the voltage it sees, it knows the current
barometric pressure (relative to altitude). Once the engine starts, the PCM looks at the voltage again, continuously
every 12 milliseconds, and compares the current voltage to what it was at key-on. The difference between current
voltage and what it was at key-on, is manifold vacuum.
During key-on (engine not running) the sensor reads (updates) barometricpressure. A normal range can be
obtained by monitoring a known good sensor.
As the altitude increases, the air becomes thinner (less oxygen). If a vehicleisstartedanddriventoaverydifferent
altitude than where it was at key-on, the barometric pressure needs to be updated. Any time the PCM sees Wide
Open Throttle (WOT), based upon Throttle Position Sensor (TPS) angle and RPM, it will update barometric pressure
in the MAP memory cell. With periodic updates, the PCM can make its calculations more effectively.
The PCM uses the MAP sensor input to aid in calculating the following:
Manifold pressure
Barometric pressure
Engine load
Injector pulse-width
Spark-advance programs
Shift-point strategies (certain automatic transmissions only)
Idle speed
Decel fuel shutoff
The MAP sensor signal is provided from asingle piezoresistive element located in the center of a diaphragm. The
element and diaphragm are both made ofsilicone. As manifold pressure changes, the diaphragm moves causing
the element to deflect, which stresses the silicone. When silicone is exposed to stress, its resistance changes. As
manifold vacuum increases, the MAP sensor input voltage decreases proportionally. The sensor also contains elec-
tronics that condition the signal and provide temperature compensation.
The PCM recognizes a decrease in manifold pressure by monitoring a decrease in voltage from the reading stored
in the barometric pressure memory cell. The MAP sensor is a linear sensor; meaning as pressure changes, voltage
changes proportionately. The range of voltage output from the sensor is usually between 4.6 volts at sea level to as
low as 0.3 volts at 26 in. of Hg. Barometric pressure is the pressure exertedby the atmosphere upon an object. At
sea level on a standard day, no storm, barometric pressure is approximately 29.92 in Hg. For every 100 feet of
altitude, barometric pressure drops 0.10 in. Hg. If a storm goes through, it can change barometric pressure from
what should be present for that altitude. You should know what the average pressure and corresponding barometric
pressure is for your area.