The fuel system on your 4.7L Dodge Durango (Dakota) is a speed density type, this means that it relies heavily on the info the MAP sensor provides to calculate fuel injection.
So, when the manifold pressure (MAP) sensor fails... your 4.7L Durango (Dakota) is gonna' resent it in a major way! Thankfully, testing the manifold absolute pressure (MAP) sensor can be accurately and easily be done using only a multimeter and a vacuum pump.
This article will show you how to bench test it (although you'll be leaving the MAP sensor connected to its electrical connector) to be able to either condemn the MAP as bad or eliminate it as the source of the diagnostic trouble code or drive-ability issue your 4.7L Dakota (Durango) is going through.
Since the manifold absolute pressure (MAP) sensor is such a critical component of your Dakota's (Durango's) fuel injection system... when this bad boy fails your pick-up (SUV) is going to feel it!
The two most obvious symptoms of a bad MAP sensor is that the check engine light will be shining nice and bright and that the engine is going to idle very rough.
Here are a couple more symptoms of a bad MAP sensor:
- The check engine light (CEL) will be on with a MAP diagnostic trouble code (DTC) stored in the computer's memory.
- Diagnostic trouble codes (DTCs):
- P0107: MAP Sensor Signal Voltage Low.
- P0108: MAP Sensor Signal Voltage High.
- Your Durango (Dakota) won't start or will have a long cranking time before it starts.
- Black smoke coming out of the tailpipe along with really bad gas mileage.
- The engine idles rough when running and has a lack of power when accelerated.