The manifold absolute push (MAP) sensor have the right to be accurately tested with a multimeter and a vacuum pump and in this write-up I"ll show you how.

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When the MAP sensor walk bad, you"ll usually see one of the complying with diagnostic problem codes save on computer in your Dodge"s computer"s memory: P0106, P0107, or P0108. If this is the case, this is the post for you.

NOTE: This tutorial only covers the MAP sensor check on 1997 thru" 2003 ram pickups/vans. Because that the MAP sensor check on 1994 thru" 1996 lamb pickups/vans, see the adhering to tutorial:


Contents of this tutorial:


The adhering to wiring diagram short article may come in handy:

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girlfriend can uncover this indict in Spanish here: Cómo Probar El Sensor MAP (Dodge 3.9L, 5.2L, 5.9L) (at: autotecnico-online.com).

Symptoms the A bad MAP Sensor

When the manifold absolute pressure (MAP) sensor fails, the examine engine light (CEL) will revolve on and you"ll see among the complying with diagnostic problem codes:

P0107: MAP Sensor Voltage also Low.P0108: MAP Sensor Voltage as well High.

Besides the diagnostic problem codes, her Dodge pickup, valve or SUV will suffer one or several of the complying with symptoms:

Rough idle.Black acting coming the end of the tail-pipe.Engine stalls under load.Engine die as shortly as the starts.Lack the power once you accelerate the vehicle down the road.

It"s rarely for the MAP sensor come go poor but the doesn"t typical they don"t. What typically happens is that some other condition (affecting engine performance) stupid the PCM (Powertrain regulate Module = fuel injection computer) into thinking the the MAP sensor is bad. Therefore it"s always a an excellent idea to test it before replacing it.

In mine experience, the pure best method to check the MAP sensor is come bench test it (and this is just how I"m gonna" present you just how to tested in this article). Through bench testing it, friend can get rid of the various other possibles that might be fooling the MAP sensor right into sending a bad signal to the PCM.

If after ~ doing the MAP sensor test and also the MAP sensor is good, climate take a look at the section: MAP Sensor password Won"t go Away.

How The MAP Sensor Works

The fuel system on her 3.9L, 5.2L, 5.9L is a ‘Speed Density’ type. I beg your pardon in place man"s terms way that it doesn"t usage a fixed air circulation (MAF) sensor to recognize the quantity of air the enters the engine.

In a ‘Speed Density’ fuel system, the PCM relies heavily on MAP sensor and also engine RPM entry to find out how much waiting the engine is breathing. When it has calculated the quantity of incoming air, it have the right to then calculation the correct amount of fuel come inject (among several things).

OK, in a nutshell, reason I recognize you"re most likely itching to obtain testing, as soon as you revolve the key and crank the engine:


The PCM gives voltage come the MAP sensor. This power is the in type of 5 Volts.This voltage is detailed thru" the cable labeled v the number 1.The PCM also provides Ground to the MAP sensorThis ground is detailed thru" the cable labeled with the number 3.Once the MAP sensor gets power and Ground, it currently starts to measure the lot of vacuum the engine is producing.With both the MAP sensor signal info and crank sensor signal info, the PCM now calculates the approximate amount of air entering the engine and:Adjusts fuel injection pulse broad and...Ignition timing.

See more: Solved Arrange The Following In Order From Largest To Smallest.

Since the MAP sensor plays together a an essential role in the performance and also efficient operation of the engine in your pickup (van, SUV), when it goes bad, your automobile is gonna" be in a people of hurt.