Originally Posted by
zip439
from the manual this is for the NA:
OPERATION
The MAP Sensor monitors the pressure in the intake manifold. The pressure in the manifold moves a diaphragm connected to piezo resistors which alter their resistance values. The output voltage of the resistors serves as infor- mation to the PCM about the pressure in the intake manifold.
OPERATION - SRT
On the Supercharged 3.2L engine, the MAP serves as a PCM input, using a silicon based sensing unit, to provide data on the manifold vacuum/pressure that draws/pushes the air/fuel mixture into the combustion chambers. The PCM use the map data combined with the intake air temperature to determine the volume of air entering the engine.
REMOVAL
REMOVAL
1. Disconnect the negative battery cable.
2. Remove the engine cover. Grasp both corners of the engine cover, and pull up firmly.
3. Disconnect the Manifold Absolute Pressure (MAP) sensor harness connector.
4. Remove the retaining bolt (1).
5. Remove the MAP sensor.
That instruction from the naturally aspirated manual is a gross over simplification.
The MAP sensor on an SRT6 is beneath and slightly forward and to the left of the throttle body. After removing the air cleaners and the throttle body, the temperature sensor, and the rubber Y on the intercooler, you can barely get a 1/4" wrench on the rear bolt, and turn it 1/4 turn at a time, then you must have a 1/4" drive universal joint, long extension, and a 1/4" socket to loosen the front bolt. It is much easier to remove the MAP sensor, then remove the connector. Don't break the small retaning clip on the connector. Then pull straight up on the MAP sensor, to remove it. The plastic nipple will most likely break off in the hole, and to remove it, you should get a long, slender screw driver and push it down through the hole, into the intercooler, where you can retrieve it with your fingers. There is nowhere for it to go when it falls into the intercooler, so don't worry about it getting lost in the bowels of your engine. You should have a telescopic magnet to remove the front bolt, because you can't get your fingers on it. When inserting the new MAP sensor, take great care to make sure the plastic nipple is inserted in the hole on the intercooler. To start the front bolt, you need one of those flexible, three fingered pick up tools, or a piece of plastic tubing that will fit snugly over the head of the bolt and allow you to reach in and start the bolt. It is very, very, very easy to break off the plastic nipple on the new MAP sensor, so be very careful and don't force it. When you replace the temperature sensor, clean it with some spray MAP sensor cleaner, not carburetor cleaner. It's available at your auto parts supplier. If I didn't already mention it, it is very, very, very easy to break off the nipple, thereby ruining your new MAP sensor. The job can be done in 3-4 hours if everything goes smoothly, but in my world it never goes smoothly. This is a frustrating job, but not incredibly technical.
Everyone suggests that you use only a Bosch, or OEM Mercedes sensors in our engines.