As I said in my E-Manage post, Craig (Arnjolt) came over today so we could try and tackle his MAP P0107 Low Voltage code that was happening on his Ecotec. Turns out, the same 330 Ohm resistor on my car for my E-Manage has corrected the problem. Here's a picture of what we did:
Please keep in mind the black wire that you don't touch is actually a red wire with a black line on the Ecotecs. We took his car out onto Woodward and wound it up to 70mph into a deacceleration to produce vacuum (this is what throws the code. The MAP reads a horribly low voltage due to vacuum). From the time we were out there (20 minutes or so), we didn't get a code like he usually does. Craig is on his way home now and I'll have him post an update once he gets there.
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omg if you have did this i will love you forever i toothought i had it fixed ha im going to radio shack right now muah i love you
is the $shiznit
"dude, thats a girls car"
No code.
I beat on my car big time on the way home. Got it up to 90+ in 4th gear, then let off the gas letting it coast while still in gear down to 65, did this several times. No code.
I started off with two different map sensor codes. 0107 Map sensor low voltage and another one (can't recall the number) Barometric pressure sensor low voltage. The Baro pressure low voltage would not go away at all, while the Map sensor would be able to get cleared and then would come back. I swapped out my map sensor for a map sensor out of an Aztek and that caused the Baro pressure low voltage to disappear and that didn't return.
After the driving I did on the way home, I'd say it's fixed. It's running quite happily.
the bearded wonder works his magic!!! thanks andy this should help alot
hehe i just did it too no code i got sick of running the soldering iron outside with an extension cord so i bought on of those butane soldering irons 19.99$ that thing rocks
did you check on your a/f when i let off the throttle it stays pretty rich it didnt lean out at all like it usually does
lemme go chec my safc though brb
"dude, thats a girls car"
i also reccomend making this a sticky cause i know alot of people have had this problem
"dude, thats a girls car"
I'll most definately do this tomorrow and see what happens. If i get time i'll even strap it to the dyno and see what i get.
It will richen you up a little bit because you're effectively shifting your map voltage up a couple tenths of a volt.
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got it, check it out though i was pretty rich on deceleration another question
arnjolt&mr. pute what are your settings im on 5 in 5 out plus how low do you go on the fuel maps and what do you set your low and high throttle to (the menu where it looks like { low25% high75%})
"dude, thats a girls car"
I don't have an SAFC. I'm an E-Manage guy
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oh fine then... get arnjolts settings then
"dude, thats a girls car"
oh @!#$ you have a 2 bar i have a 1 bar map sensor i think i found the rich problem hmm they put out the same voltages right??? or would i have to go lower or higher on the resistor?
"dude, thats a girls car"
Regardless of which resistor you put in, you will no mattter what richen your mixture. Why? Because you are shifting your map voltage up!
Why are you so concerned about your car being rich? Here's the problem you're trying to fix. Without using a resistor to compensate for the low voltage, your car will trip a P0107 OBD code. Doing so causes the car to go in limp mode and will put the car in open loop at idle. Why are you trying to fix this problem? Because it's annoying and you just added a A/F mixture computer to your car. Now that you've got the problem corrected with a resistor, mearly adjust your map down a couple notches to compensate for the rich situation. Simple as that.
Craig's car has a 1 bar map on it. Granted, it's an Aztek sensor, but it's still a 1 bar. Both of our cars are using a 330 Ohm resistor.
Higher resistor means less voltage will be added. Lower means more.
Here's the P0107 info:
CIRCUIT DESCRIPTION
The PCM uses the Manifold Absolute Pressure (MAP) sensor to control the fuel delivery and the ignition timing. The MAP sensor measures the changes in the intake manifold pressure which results from engine load (intake manifold vacuum) and the RPM changes; and converts these into a voltage outputs. The Powertrain Control Module (PCM) sends a 5 volt reference voltage to the MAP sensor. As the manifold pressure changes, the output voltage of the MAP sensor also changes. By monitoring the MAP sensor output voltage, the PCM knows the manifold pressure. A lower pressure (low voltage) output voltage will be about 1.0 to 1.5 volts at idle. While higher pressures (high voltage) output voltage will be about 4.5 to 4.8 volts at Wide Open Throttle (WOT) . The MAP sensor is also used, under certain conditions, to measure barometric pressure, allowing the PCM to make adjustments for different altitudes.
CONDITIONS FOR RUNNING THE DTC
DTC P0122 or P0123 is not set.
The engine speed is less than 1000 RPM . Or
The engine speed is more than 1000 RPM and the Throttle Position (TP) sensor is more than 15 percent .
CONDITIONS FOR SETTING THE DTC
The MAP is less than 11.8 kPa .
The above conditions are met for at least 6.25 seconds .
ACTION TAKEN WHEN THE DTC SETS
The Malfunction Indicator Lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.
The Powertrain Control Module (PCM) will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.
Coolant fan turns ON.
The PCM will substitute a fixed MAP value and use Throttle Position (TP) to control the fuel delivery (scan tool will not show defaulted value.)
The vehicle will operate in Open Loop when the vehicle is under 8 km/h (5 mph ). The vehicle will operate in Closed Loop when the vehicle is over 8 km/h (5 mph ).
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you are the man MR. PUTE
"dude, thats a girls car"
No I'm not. All the thanks should go to Protomec. He suggested the fix for my E-Manage. I just carried it over from that.
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well much obliged then thank you both you have no idea how f-in much that f-in light bothered me
"dude, thats a girls car"
i just went and drove some more just doesnt seem right for some reason if i rev up the motor a little and let off it kinda sticks per say at 2000 rpm and its real rich then after about 2 seconds of this it goes lean and drops down to idle about 950rpm i think im gonna go with a bigger resistor, the voltage from the map sensor when i let it decelerate in gear(causing real low vaccum) is 1.47v at idle its around 1.57 (w/resistor) im gonna go get a bigger resistor tommorow oh yes being that rich will kill you i hit my n20 and couldnt even feel it i thought i was out i checked and had plenty of liquid n20 i turned my safc down to -15% and it made an ungodly difference (i smoked the @!#$ outta a new sunfire hehe) but it still does the sticky thing i want this thing running perfect cause the turbos on the way and im sure this would complicate everything ten fold for me im let you know tommorow how it works out ive had this thing for 8 months and this is the first time its actually worked half a$$ right for this long 7 hours now and now low map sensor voltage code so you deffinetely got me pointed in the right direction
"dude, thats a girls car"
Yeah, try a lower resistor. Under a high rpm deacceleration (high vacuum) in Craig's car, we were getting around .5 volts. Idle was high like a mofo (1.90volts) due to the fact that he's gotta get the car tuned at the dyno.
Try 470 ohm. If that doesn't work, step up to the next logical resistance of 680 ohm.
What kind of voltages were you getting before you added the resistor?
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.478v w/out the resistor at idle i never though to check this so i dont know what it was on deceleration ill check it all out tommorow
"dude, thats a girls car"
Try and get it to bump up to .75 volts at idle. That's where my car sits happily with the E-Manage.
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