The car: 2000 Legacy GT EJ25 SOHC

 

So on my sisters car, in 2010, she started getting a code to replace the MAP sensor, easy enough - Replace it. But now the code came are these sensors crappy or something? i've never replaced one on any of my cars and now her's has gone through 3?

 

Only thing i'm seeing is maybe some dirt contaminants getting around the air filter and clogging it? (i saw some dust around the sensor)

 

edit: code is p0107

 

 

-Justin

Edited June 23, 201312 yr by crazyman03

When you replace the MAP sensor how long does the code go away?

Have you done any checks on the wiring or tested the MAP sensor with a multimeter to see if it checks out ok?

I had some fun with a repeat MAP sensor code, check for proper voltage to the sensor. Should be 5 V with the sensor plugged in. If not there is either a connection issue or the ECU is bad.

Is the sensor supposed to read 3.28 Volta at a sitting state? If I give it vacuume it shows less and pressure shows more volts but at a rest state it shows 3 on the first wire. The reference shows +5 as expected..

That sounds about right for atmospheric state. Under vacuum (engine running) I think it should be something like 1.9v. There isn't any reason it should have to be under pressure on a N/A car.

 

Did you check reference with the sensor plugged in?

Have you checked ground resistance?

Error code P0107 means that the ECU is seeing a low input from the sensor for some reason. This doesn't necessarily mean that the sensor itself is faulty. After replacing so many sensors this really seems to indicate the problem isn't with the sensor but very well could be with the wire connection to the ECU or the ECU itself could be faulty. Check the resistance from end to end on the sensor output wire to the ECU. Also check for possible connections to ground or power on that wire.

I found was two types of codes one for senser falure and one for wire contanuity faliure is important to know witch is going on probly a wire harness problem never asume that a code for a part means the part is a problem .

Or mabee engine has low vacume and it just thinks the map is bad it can only blame what it thinks is wrong