Hello I have a stored code P0106 Bad MAP/BARO sensor?
i have a 2005 F150 with the 4.6.
it idles really low and dies when stopping or engaging into any gear.
I just replaced a O2 sensor after having that issue, now this one. My question is, where the hell is a MAP or BARO sensor on this thing?

 

part of the air intake system ... you can remove the MAF sensor and try cleaning it with some CRC MAF cleaner which you can buy at walmart. disconnect neg on battery...remove and clean ...let dry... re-install.. fired it up.. if code remains .. replace the MAF sensor.

 

The MAP sensor is not part of the MAF sensor, it's integrated into the ESR on this engine. Do not do anything with the MAF sensor.

The DTC does not say that the sensor is bad, it says the output of the sensor, as seen by the PCM, is outside of allowable limits. You have to do the diagnostics to determine if it's due to a faulty sensor, a wiring problem, or some other concern. Failure to follow the diagnostics too often results in wasted money and time.

 

'ESR' on this engine ??? I (for one) do not have a clue what that is.

I readily admit I'm not a Master Tech, engineer or Ford Service Mechanic with years of experience, but as well seasoned owner of a one of these self-maintained trucks for 16 years, I figure I my knowledge of the workings on them is at least average. Cmmunity statistics indicates the Forum has 325,470 members - suggesting very possibly there's 162,735 members who also do not have a clue what you are talking about or WHAT @Chasinglyons should go look for to find the ESR on this engine.

I know the truck don't have a MAP sensor (hence consider the DTC description as STUPID as the ones for P0340 and P0345). I also know that many of the non-Einstein forum members on here tend to convict the messenger and replace the sensor rather than considering mechanical cause for its unacceptable 'output' to PCM.

But the truck does not have a BARO sensor. That is calculated by the PCM from some inputs (unknown to me fully). But the truck has an MAF sensor and an Idle Control Valve - either of which could result in low idle, screw up O2 output readings, and possibly effect volumetric efficiency --- and thus calculations of BARO. Could that play into the factors producing the DTC?

 

[QUOTE=F150Torqued;6476062]'ESR' on this engine ??? I (for one) do not have a clue what that is.

I readily admit I'm not a Master Tech, engineer or Ford Service Mechanic with years of experience, but as well seasoned owner of a one of these self-maintained trucks for 16 years, I figure I my knowledge of the workings on them is at least average. Cmmunity statistics indicates the Forum has 325,470 members - suggesting very possibly there's 162,735 members who also do not have a clue what you are talking about or WHAT @Chasinglyons should go look for to find the ESR on this engine.

I know the truck don't have a MAP sensor (hence consider the DTC description as STUPID as the ones for P0340 and P0345). I also know that many of the non-Einstein forum members on here tend to convict the messenger and replace the sensor rather than considering mechanical cause for its unacceptable 'output' to PCM.

But the truck does not have a BARO sensor. That is calculated by the PCM from some inputs (unknown to me fully). But the truck has an MAF sensor and an Idle Control Valve - either of which could result in low idle, screw up O2 output readings, and possibly effect volumetric efficiency --- and thus calculations of BARO. Could that play into the factors producing the DTC?[/QUOTE

Torque,

Your awesome! Lol

 

Oops, that should have read ESM for EGR System Module. Early Monday morning typing....





Yes, it does have MAP sensor. IIRC, the BARO value is either a calculated value (based on other sensors) or there's actually a sensor internal to the PCM. I forget which variant this one is. Edit: See below...]

This engine doesn't have an IAC valve, it's a electronic throttle body.

Okay did some more poking around. The BARO value comes from the MAP sensor at key-on. Since there is no EGR or exhaust flow at that time, MAP=BARO initially. BARO can then be further updated based on calculations using data from various other sensors. TSB 05-03-01 has some good info regarding this.

Cheers!

 

No problem. You can count on my vote that a one word typo before the first Monday morning cup of coffee is NOT AN IMPEACHABLE OFFENSE - no matter what Adam Schiff says.

Besides that fact - It wouldn't have made any difference anyway as I wouldn't have known what an ESM was either. But that's no longer the case.

I knew my 5.4L 3v didn't have an EGR or IAC - but thought the 4.6 still did in 2005. Proof positive - RockAuto is no better than the New York Times (damn fake news). They list 2005 4.6 part numbers (even Motorcraft) for Idle air Control (IAC) Valve Connector, Idle Speed Control Motor Connector, Idle air Control Valve gasket -- but I couldn't find an IAC valve. Imagine that.

But you have, through the above diagram and TSB reference, nudged me one more micron further above the average shadetree mechanic in these matters. I had NO idea (but by all counts should have realized) the DPFE has NOT ONE, but TWO 'pressure sensors' to derive Differential Pressure. I would not have naturally guessed they would be called "MAP" (Manifol Air Pressure) sensors, but they are, so I give up. Even though the fake news still reports part numbers for MAF for that truck. ???

You're correct. BOTH DPFE pressure sensors at Key On before engine starts should read the same and equal to present barometric pressure. If they didn't read the same ------ Might reasonably be reported as P0106. And the PCM then factors readings from those two pressure sensors by some geographic data and ambient air temperature sensor to 'fine tune' BARO() reading. Kinda clever! Now I gotta worry about how that happens on my 5.4L 3v since it ain't got no DFPE sensor at all.

The OP might look into the physical / mechanical inputs, and corresponding outputs of those three sensors on his truck and verify proper and reasonable outputs from them.

 

guess i was way... wrong, I thought the op made a typo on MAP

 

Ok, so,

Trying to interpret all this correctly.

On the 5.4 3v, the BARO is calculated by the MAF correct? I guess maybe infers some data from the AATS as well?

Its something iv researcresearched in the past and ended up getting a new MAF but was still not ABSOLUTELY EDUCATED on the matter enough to understand the logic completely.
I have however, verified the BARO with two separate instruments to ensure the readings were accurate as it seems an inaccurate reporting of the BARO can cause lots of issues with fuel trims ect.

I'd say, please correct me if I am wrong but, I'm sure some will!

 

Correct: I think you have it interpreted correctly. [M]*** Air Flow, engine displacement, RPM, adjusted for density by input from Ambient Air Temperature Sensor (AATS) is the initial basis for determining BARO on the 5.4 3v. Although I have _NEVER_ been able to get my "Volumetric Efficiency" formula in Torque Pro to work correctly. Formulas get hairy sensitive when most elements are on orders of negative six to ten power. (( I believe this --- relates somehow --- to the signal output from the Charge Motion Control Valve that I have been trying for some time to unravel.)) I still haven't figured THAT out: https://www.f150forum.com/f4/f150tor...-valve-432520/