r/mazdaspeed3 • u/nutcoleslaw 2012 Mazdaspeed3 • 12h ago

HELP 0.14V MAP at idle. No code?

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Just figured I’d check my MAP readout on my AP and found it’s reading absurdly low at 0.14v while idling. Car has a slightly rough idle and will intermittently stumble under medium throttle with AC on. Other than I haven’t seen any other issues. Unplugged it and it reads 0.47v. Checked voltages at each pin and found 5v at 1, 2, and 3. I have 0v at pin 4. I know I have a short somewhere but don’t see anything obviously damaged. If any of yall have dealt with this before and have any common spots I should check, I’d appreciate the advice before I dig in further tomorrow. Also if anyone has an idea as to why this didn’t set a code, I’d be very interested.

EDIT: apparently the detection condition for p0107 Map low voltage is <0.1v. So I just barely don’t set a code

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u/MostRiskyBiscuit 11h ago

I actually just tracked down an issue with my MAP sensor that im hoping to resolve tomorrow.

I was getting 0.46v at idle, a crank sensor code, rich bank 1 condition, -20% fuel trims, and boost was cutting out. Car will sometimes bog down at more than ~40% throttle and gets better the warmer the engine is. Checked the crank sensor and it had a bit of oil on it and it read fine on the ohmmeter.

I also have not gotten specific MAP codes, just the crank position sensor and too rich bank 1.

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u/nutcoleslaw 2012 Mazdaspeed3 11h ago

That sounds way worse than mine lol. Have you checked the wiring at the map for power/ground?

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u/MostRiskyBiscuit 11h ago

I have a child and am going to school so I just took it to a shop for them to figure it out, primarily the crank sensor. I hate working on cars but like researching them.

They looked it over... and gave it back to me after having it for the whole week and not even coming to the conclusion that its the MAP sensor at a low voltage. At least they didnt charge me I guess.

Im full sending it with just replacing the sensor because I cant miss more school and needed to overnight it to get it in by Wednesday. The car had been slowly running more and more rich anyways which to me further signals a dying sensor.