2006 DODGE RAM SRT-10 Service Repair Manual

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Page 2313 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 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)

Page 2314 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 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.

Page 2315 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 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 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.

Page 2316 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual REMOVAL
3.7L V-6
The Manifold Absolute Pressure (MAP) sensor is
mounted into the front of the intake manifold
An O-ring (2) is used to seal the sensor to the intake
manifold.
1. Disconnect electrical

Page 2317 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 4.7L V-8
The MAP sensor (3) is located on the front of the
intake manifold. An O-ring seals the sensor to the
intake manifold.
1. Disconnect electrical connector at sensor.
2. Clean area around MAP se

Page 2318 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 1. Disconnect electrical connector at sensor by sliding
release lock out. Press down on lock tab for
removal.
2. Rotate sensor (3) 1/4 turn counterclockwise for
removal.
3. Check condition of sensor O

Page 2319 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual An O-ring (2) is used to seal the sensor to the intake
manifold.
1. Clean MAP sensor mounting hole at intake mani-
fold.
2. Check MAP sensor O-ring seal for cuts or tears.
3. Position sensor into mani

Page 2320 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual An O-ring (2) seals the sensor to the intake manifold.
1. Clean MAP sensor mounting hole at intake mani-
fold.
2. Check MAP sensor O-ring seal for cuts or tears.
3. Position sensor into manifold.
4. I

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