Map Sensor Testing?
 

Would really appreciate info on how to test the map sensor in my truck. Thanks

Test it for what?

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To see if it's working properly

hook up a scangauge and read what it is showing for boost via obdII

or check for codes. bad map usually throws codes.

Thats a bit of a loaded question. Why do you suspect theres a fault.
Theres 3 types of failure, loss of ground, loss of vref or the failure of the variable resistance portion of the sensor. Testing each portion is fairly simple.
Theres two modes of failure, constant and intermittent. Constant is pretty easy to determine the type and cause of failure. Intermittent failures are often frustrating with little data to aid in repair. Intermittent issues are often the cause of disagreements between shops and vehicle owners.
But this just covers testing the sensor, its inputs and its output (signal). Theres always the possibilty of a module failure. Typically the module would receive the correct voltage but would fail to see the voltage or wouldn't correctly interpret the voltage. Wiring issues could also be an issue. Typically to correctly test it you'll need a scan tool and a dvom and a paper clip. The issue will need to be present while testing.
The method of driving and watching the boost is not actually testing the sensor. We can see if the resistance changes indicating higher or lower boost and see if those numbers correlate to the actual produced numbers (requires a manual boost gauge) but this is only one small portion of the testing required to condem a component. While many may have luck testing this way or just replacing parts from a professionals stand point its never a good idea!
Hope this helps.


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