P0101 OBD-II Trouble Code
Technical DescriptionMass Air Flow (MAF) Circuit Range/Performance Problem
What does that mean?Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.
SymptomsYou will likely not notice any serious drivability problems, although there may be symptoms.
Possible SolutionsThe simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Inspect for the following conditions:
An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor.
A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON.
When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
A high resistance on the ground circuit of the MAP sensor can cause this DTC to set.
Any loss of vacuum to the MAP sensor can cause this DTC to set.
Seem there are many factors...must figure out soon.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Well, now I have clean the MAF again. But not know if it is better or not because the engine run the same.
I try disconnect the air duct before the MAF and run the engine. At idle I feel air pressure from the air duct that run from the Kompressor.
At this point I would like to know that is normal or not..? I understand that at idle, the Kompressor should by pass the air from the air filter. And will start compress the air when rev 1500 RPM up. This will call boost right..?
So I am confuse now.....and thinking to install a boost gauge to see how the engine perform with boost and vacuum....
And could you please let me know the normal boost pressure of Kompressure.
So I would buy the correct range of boost gauge.
If it boost all the time, may be the by pass valve should be a problem.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Update : Today just add a ground wires set. Not notice any improvements yet but seem that throttle response more quicker slightly. And engine vibrate less when idle.
I run the ground wires to throttle body, engine block, left group of wires that run to ground . And a wire from the wire distributer to the negative terminal of battery.
Also I have order boost gauge already. After install completed, will post pictures here.
This should reveal some info about Kompressor's behavier.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Today, after long trip the engine sign light up again. I have clear the light by scan tool recently without fixing anything and this is second time light up.
I have not scan the fault code yet. Tomorrow I will find out. May be the same code...I think.
Have connect a scanner to the car' OBDII port. Got the code P0101 Mass Air Flow range/performance problem. I will try cleaning the MAF again. If no improvement may be a new MAF should solve the problem of running too rich.
I would just get the new MAF, since you tried cleaning it and still no luck. The money you save on gas from the new MAF is going to cover the MAF eventually anyways. I wouldn't wait.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Quote:
Originally Posted by DACHIGGA
I would just get the new MAF, since you tried cleaning it and still no luck. The money you save on gas from the new MAF is going to cover the MAF eventually anyways. I wouldn't wait.
Yes, DACHIGGA. I think so. However with my scanner I see live data of MAF when working is looking good. I see nice response in time and g/s...
But may be the MAP sensor is going bad. I see small change in value of MAP sensor, but not too much sure of, I will study more about the MAP sensor.
At this time I know there is something wrong. Calculated value of MAP sensor, baro sensor not match with MAF value.
Tomorrow I will pull out the freez frame data that logged when DTC is set.
About the wheel is fine because the car just have change all four new tires few months ago. I suspect that the wheel bearing may be the cause of vibration. Will check at the tire shop again soon.
It may or may not be the bearing. If the bearing is going bad you would hear a tramming sound or humming from whatever side was going bad. It can also be a ball joint as those can go bad from rough roads again you would hear very slight thumping. Take it back to the tire shop that did the install. They may have incorrectly balanced the wheels or if they add'd weights on the inside of the rims one could have fallen off that happens.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Quote:
Originally Posted by MelloC230
It may or may not be the bearing. If the bearing is going bad you would hear a tramming sound or humming from whatever side was going bad. It can also be a ball joint as those can go bad from rough roads again you would hear very slight thumping. Take it back to the tire shop that did the install. They may have incorrectly balanced the wheels or if they add'd weights on the inside of the rims one could have fallen off that happens.
Thank you Sir Mello, I will check for the wheel balance again.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Quote:
Originally Posted by DangTH
Yes, DACHIGGA. I think so. However with my scanner I see live data of MAF when working is looking good. I see nice response in time and g/s...
But may be the MAP sensor is going bad. I see small change in value of MAP sensor, but not too much sure of, I will study more about the MAP sensor.
At this time I know there is something wrong. Calculated value of MAP sensor, baro sensor not match with MAF value.
Tomorrow I will pull out the freez frame data that logged when DTC is set.
Let discuss together.
Regards,
Hook the scanner and got the code P0119 engine coolant temp circuit intermittent. Not the same of the first code P0101
So headache now...many problems.
I think it may be the temp sensor is going bad or the wiring harness concern.
I have freez frame data recently is :
Load Value 15%
Coolant temp 69 degree C.
Short term fuel trim 7.0 %
Long term fuel trim 4.7 %
Engine RPM 2909
------------------------------------------------------ Also I got live data when engine off
Load Value 0%
Coolant temp 30 degree C.
STFT 0.0 %
LTFT 7.0 %
Manifold absolute pressure 98 Kpa
Engine RPM 0
Intake air temp 35 degree C.
Intake air flow 0 g/s
------------------------------------------------------ And this data when engine running at idle for 3 min.
Load Value 18%
Coolant temp 44 degree C.
STFT -1.6 %
LTFT 7.0 %
Manifold absolute pressure 39 Kpa
Engine RPM 816
Intake air temp 32 degree C.
Intake air flow 3.74 g/s
------------------------------------------------------
Now I did not clear the fault code yet and the car run fine with engine sign light up.
What should be wrong or should be replaced....please advice.
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 130
Two things I did not check yet, the PCV valve-hose and air flap at the Kompressor.
Did anyone have done on this..? I always hear a strange sound near the kompressor when rev pass 1500 RPM up and down.
Linear Mode
