Maf Sensor Reading Too High

Here is the data from our subject vehicle. Radiator cooling fans not shutting off. Usually, best practice dictates starting with the simplest and least expensive repair first. Mass Air Flow Sensor Description & Related Information. If voltage increase is present at the sensor output the technician needs to ensure voltage increase is also present at the computer input terminal. Fuses are ok. 26 - Mass Air Flow Sensor was greater than 0. The conditions for setting this code are:. MAF (VAF for 2. The maf says it's at like 2500 grams per second. I am attempting to scale a new MAF in romraider. Noticed I could literary take my foot of the gas pedal when doing 40 or 50 and it would not slow down. Coincidentally I'm selling a VG33E MAF on ebay right now for cheap (though again your problem doesn't sound MAF. It seems that connecting the scope to pin 5 influenced the reading, as you described that you had variations before,Keith's comment therefore NR, no offense. A leaking EGR valve is an often discovered problem. Reading Diagnostic Trouble Code (DTC) Memory Voltage at hot wire MAF sensor (B2/2) insufficient or too high, or open circuit in ground wire at hot wire MAF sensor. CEL came on, code for MAF voltage too high, and knock sensor. If a sensor stays lean or rich for a long period of time, lean or rich codes may set. A failed MAP sensor can cause your vehicle to have a few performance problems. My MAF was reading too high (out of acceptable range) when the car was on idle (my car has a noisy idle - diesel knock), but as soon as you press the accelerator the readings become normal and the engine sounds excellent!. Circuit Description. The problem is that i saw in a video that MAP sensor reading of a Ford was the exact opposite of my car!. Look for damaged, loose, or aftermarket components that may affect airflow through the MAF sensor. Ok so just put in a brand new mass air flow sensor and it still coding out po102 which is low mass air flow current. I recently cleaned my MAF sensor and also my Throttle Body. No fluctuations at all. The ECM uses the information generated by the MAF sensor to control exhaust gas recirculation (EGR). Verify the integrity of the air induction system by inspecting for the following conditions:. In these cases you are best off treating the MAF sensor alone. I wanted them to do a MAF test and a EGR valve test. The conditions for setting this code are:. MAF sensor flow straightener query will the MAF sensor read too low or too high? is there to smooth air flow over the sensor to help give a it *stable* reading. In other MAF designs, the IAT is located downstream from the MAF sensor. Diagnostic Trouble Code (DTC) P0101 will set if the actual MAF sensor signal is not within a predetermined range of the calculated MAF value. for reading Autoblog. MAF 0-5v signal wire not responding. Like the MAP sensor, if a trouble code sets for a MAF sensor error, some things must first be checked before replacing the sensor. 5 volts if grounded correctly. 5 volts at idle and 4. vauxhall corsa sri - maf sensor. (which can be calculated from. 16 is ref/signal to the intake air temperature and 94. Unfortunately this can be tough if the MAF sensor is located too close to an elbow, or the filter is too close etc, MAF sensors need very laminar streamlined flow to read correctly. Monitor the fuel trim readings at idle and at 55 MPH driving down the road. This diagnostic code must be attended to very quickly, because if it remains on for a long time, the 3-way Catalytic Converter (TWC) can get damaged. So I'm still getting those code P0401 - air mass too highcar is a 2004 330d m57n I cleaned the MAF and made sure that was ok, it's fine, and I replaced the EGR valve ( with a 2nd hand one of. A Mass Air Flow Sensor is not so cheap but it is not very expensive either. Temperature Circuit High Input - Open in IAT sensor circuit - IAT sensor (built into MAF meter) - ECM. P0108 is the code for a problem with the MAP electrical circuit sensor having too high voltage input to the Engine Control Unit (ECU). The conditions for setting this code are:. I performed a KAM reset to return the alcohol content to zero, and I left the fuel pump jumpered to high-speed mode. This is at idle. 5 maf sensor with 5 wires 2 and 4 pins both read 5v, lambda sensor turns no activity or intermitent, i changed both alrady maf and lambda sensor, maf shows signal too low, did i damage the ECU? I remember using some of the car grounds to install other accesories without removing the - pole from batery,. Even timing can affect combustion efficiency and thus BLMs. MAF sensor while doing a full throttle run in 2nd gear, as shown in Figure B. This is a "MAF TRANSLATOR BOX AND A LS1 MASS AIR FLOW SENSOR" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3. Now everything was making sense! This truck learns alcohol content by watching fuel trim, MAF readings, and injector pulse width. 5 volts at idle and 4. The BLM can also show a need for a change in the PCM tune; if the VE tables are set too high (low BLMs) or too low (high BLMs), or if the MAF sensor is miscalibrated. No change during throttle depression: Repeat self test procedure: 171: Lambda sensor (right) 172: Lambda sensor (right) too lean : 173: Lambda sensor (right) too rich : 174. The signal line is the signal return to the ECM. Here at Advance Auto Parts, we work with only top reliable Air Flow Meter/Mass Air product and part brands so you can shop with complete confidence. It is too high or too low'. If you've failed your emission test due to high HC readings, this post is for you. Causes of EEC-IV, OBD I Code 125: This In-Range Self-Test was designed to identify Air bypass solenoid high/stuck open (MAF may in-range concerns of the MAF sensor, TP sensor, or indicate high during this event). You can get all the readings while in park. COOLANT SENSOR TROUBLE CODES. Cel inop but had 4 codes, po100,110,171,120. Once in a while we may encounter a total failure of a MAF sensor, one that is, perhaps, short circuited or internally open. The ECM uses the information generated by the MAF sensor to control exhaust gas recirculation (EGR). Intake Air Tempature reading too high - MAF? IAT sensor (if non functional) will give a -48 deg reading in VCDS and will throw fault codes of some description. my check engine light just came on and a reading from auto zone showed that it is the mass air flow sensor. We will cover exactly what that means and potential fixes for it below. This combo may also be found in setups where a larger MAF may become too turbulent at low load, and the MAF is used at high load for more accuracy in a naturally. Throttle response will be non-existant but you should be able to get up to speed as a check of the MAF. Some manufacturers incorporate the Intake Air Temperature (IAT) sensor as part of the Mass Air Flow (MAF) sensor (Air Flow Meter). If the mass air flow sensor is faulty, the calculated load reading typically is low during a wide-open throttle acceleration. So if the maf is reading too high/too low then egr/boost fault. If you're experiencing bad MAF sensor symptoms, AutoZone is the one stop shop for all the replacement parts you need. A scantool displays manifold pressure in volts. You should put your year/model/engine info in your signature. Every month, do another one, at the same conditions. When "false" or un-metered air enters the intake system downstream of the MAF sensor, the MAF sensor will underestimate intake air and drive the fuel system too lean at idle or low engine speeds. com There are two easy ways to contribute to Caddyinfo. The air intake system from the air filter. A stored code P0127 means that the powertrain control module (PCM) has detected an input signal from the intake air temperature (IAT) sensor circuit which is indicative of the temperature or circuit voltage being too high. I can't check the wiring diagram now to be sure because I am at work. Obtain sensor specifications from a reliable source; you can send us an e-mail from the Help Link and we can assist with most information. The MAF sensor is used to measure EGR rates on a modern derv, the EGR operation is compared to the MAF readings then the ecu can work out what % of EGR is going into the cylinders. If the sensor is in error, reading too high, it can cause the fuel management system to use more fuel than is needed. Changed oil pressure sensor with oem. Tap lightly on the sensor and note the meter reading. 16487 - Mass Air Flow Sensor (G70): Signal too High P0103 - 35-00 - - Readiness: N/A. When the low cost is for items that you'll require, it may be a good idea to utilize it. In most cases, this code is not very difficult to diagnose. Fuel trims may also be negative at idle with a bad or dirty MAF. As a result of late intake valve opening, the vacuum will be low, causing the MAP sensor to see a load adding more fuel, causing high CO. I am not sure what the 1gs reading are but the Signal wire should be around 0. On GM MAF sensors, there are a couple of quick checks you can do for vibration-related sensor problems. Fuses are ok. Scanmaster readings in high gear. Noticed I could literary take my foot of the gas pedal when doing 40 or 50 and it would not slow down. top: test the comparison of the TP sensor and MAF sensor readings are not consistent with. AutoZone Repair Guide for your Driveability And Emission Controls Electronic Engine Controls Mass Air Flow (maf) Sensor too close to high voltage wires such as. Mass Air Flow converters On a rainy Monday, when you're late for work, suddenly your TDI looses power. Oxygen messfühler analyzers could also be used to distinguish if the air- fuel mix in rich or even lean; Spend a great vacation in this particular spectacular destination and cherish the. Record your MAF sensor reading at idle, and again at various RPM ranges. I noticed that some Bosch data sheets show the negative flow reading and some just show the sensor output starting at 1 volt and don't publish the 0-1 volt data at all. LONGFT1 values that differ greatly from LONGFT2 values would rule out concerns that are common for both banks (for example, fuel pressure concerns, MAF sensor, etc. p0105-inlet pressure sensor signal voltage too high p0105-inlet pressure sensor signal voltage too low. Now, in case you wondering if this test applies to your specific vehicle, this article covers the MAF sensor on 1996 thru' 2005 3. This one is more for a hunting or erratic idle, the original speech was for a 'shaking' or 'rough' idle. have disconnected vac pipe at sensor still reads 118mb, tried new map sensor reads same. However the MAF reading was off using this same test. The amplifier buffers the MAF output signal and has a resistor that is laser trimmed to provide an output range compatible with the computer's load tables. Attach an analog voltmeter to the appropriate MAF sensor output terminal. At idle, my MAf reading is 4, sometimes 5. When refitting make sure the rubber seal on the throttle body is intact and flat. p0101-maf sensor signal positive deviation. A mass air flow (MAF) sensor responds to the amount of air flowing through a chamber containing the sensor. The MAF sensor works by outputting a frequency signal that is proportional to the airflow through the meter. Troubleshooting and Diagnosis of Toyota Tacoma Pickup Stumble and Driveability Problems. If you test the other leads associated with the MAF and you see another 5V reference and a return voltage those will be for the intake air temp. What would cause the mass air flow sensor constantly put out low input 43 Answers. Common Symptoms Of A BAD Ford MAF Sensor. Mass Airflow Sensors. The MAF I will fit tomorrow as its a 5 min job to replace and reset adaptations. 7 lost the right side manifold bolts on the back cylinder a few weeks ago. Intake Air Tempature reading too high - MAF? IAT sensor (if non functional) will give a -48 deg reading in VCDS and will throw fault codes of some description. A good sensor should show no change. The other problem with high o2 levels is that they can cause the o2 (lambda) sensor to see this air as a weak mixture, which in turn can cause the engine management system to add lots of excessive fuel to be added, which will show up as high carbon monoxide readings and possibly even high hydrocarbon levels. A difference of more than a few degrees indicates a problem. )sensor is unplugged,or the vacuum (some had a vacuum line) to it is lost,the engine will not. The OBD-II code P0101 is set when the signal from the mass air flow sensor is out of expected range, or in other words, the MAF sensor doesn't work properly. It s an AUM engine with a stage 1 map, jetex filter from bill, and a 3 DP/decat. Lack of power on acceleration. Your engine’s Manifold Absolute Pressure (MAP) sensor could be the culprit if you're still getting lousy gas mileage after a tune up. P0103: Mass Air Flow (MAF) Sensor Circuit High Input. A Mass Air Flow Sensor is not so cheap but it is not very expensive either. A reading of 128 +/- 10 is considered normal readings. relacion de codigos ECM, diagnostico mecanica automotriz. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. Before you replace your (MAF) sensor there might be a chance a cleaning is all you need. Leaks in the air induction system or intake manifold can cause the MAF sensor to produce false readings, so can faulty wiring. In most cases, this code is not very difficult to diagnose. If the intake air ducts are faulty, replace them first and see if the problem you are having is remedied. P2073 Manifold Absolute Pressure/Mass Air Flow – Throttle Position Correlation at Idle. As such they lack a mechanical carburetor and instead split the function of the carburetor into three parts, namely the Air Flow Meter in the air cleaner box, the throttle body and the fuel injector. In this video i am diagnosing fuel trim numbers along with a dirty MAF Sensor. Today, I got a check engine light, being far from home, I took it to the nearest place I could find that would read the trouble code (which ended up being the Midas next to my work). 1v is signal, which should increase to almost 4 v at 4000 rpm,5. I'll also change the fuel filter to see if it helps. Buy AIP Electronics Premium Mass Air Flow Sensor MAF AFM Compatible Replacement For 1994-2005 Buick Cadillac Chevrolet GMC Oldsmobile Honda and Pontiac 3. Codes that may indicate a problem with the sensor include: GM: Code 33 (too high frequency) and Code 34 (too low frequency) on engines with multiport fuel injection only, and Code 36 on 5. Still having the problem of it not wanting to start up the second time I try to crank it, have to keep giving it gas and eventually it will run and idle in MAF mode. Fuses are ok. vwautotech. A mass air flow above specifications at idle can be caused by too little exhaust flowing through the EGR valve. just replaced the maf sensor (genuine bosch) fault code on maf gone! maf is about 14. Coincidentally I'm selling a VG33E MAF on ebay right now for cheap (though again your problem doesn't sound MAF. Checked the resistence of the N75 vale and it was around 28. Temperature Circuit High Input - Open in IAT sensor circuit - IAT sensor (built into MAF meter) - ECM. This is a "MAF TRANSLATOR BOX AND A LS1 MASS AIR FLOW SENSOR" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3. However, some vehicles that have both types of sensor respond better treating the MAP, so if your vehicle has both sensor types, and your treatment of the MAF hasn't gotten you results, try the treating the MAP instead. So I finally had a chance to dig into this issue, and come to the conclusion of it being the ECM. Now everything was making sense! This truck learns alcohol content by watching fuel trim, MAF readings, and injector pulse width. Some MAF sensors also include an intake air temperature (IAT) sensor that helps the PCM calculate air density. Because the metering capability of the sensor is dictated by the maximum airflow reading it can report, having it report a value that is artificially high reduces the metering capability of the system. A MAF sensor that behaves like this will require replacement. Verify the integrity of the air induction system by inspecting for the following conditions:. Solving Honda Idle Issues (hunting idle) was created by EricTheCarGuy This forum is flooded with questions about Honda idle issues so I've put together this 'revised' idle speech. Hi everyone, So The replacement MAF sensor arrived today and I just fitted it (a genuine expensive one from Island 4x4) Started the car and starts perfectly but now there is a huge flat spot at low end RPM, Engine doesn't stall or anything but with the MAF plugged in even when you floor it in 1st gear the RPM creeps up so slowly. Rough idle or stalls. Throttle response will be non-existant but you should be able to get up to speed as a check of the MAF. With the Dodge Caravan, P0101 means the the Mass Air Flow (MAF) sensor has a Range/Performance problem. The signal from the sensor is shown and can be downloaded. My car is a Peugeot. Denso 197-6020 Mass Air Flow Sensor. 5 volts with engine running (R). Speedometer reading MUCH too high. Symptoms of a bad sensor would include the oil temperature gauge jumping all around or a trouble code coming and going rapidly for engine oil temperature being too high. Analog MAF sensors produce a variable voltage output, whereas digital sensors send a frequency output. When i open the throttle, the reading DROPS (for example at 2500 RPM it shows around 260 mbar) With the engine OFF and ignition ON it reads exactly the barometric (atmospheric) pressure of our city which is about 870 mbar. Megasquirt Support Forum (MSEXTRA) with the MAF sensor my required fuel was 7. 8 conversion it gives 455 hp, my car was dynoed at 461 hp few months ago, "experts" said it should be at around 430 real hp. The mass air flow sensor is a critical piece of equipment on your air filter. 5 volts means the DPF is blocked beyond a regeneration this is why the PCM is constantly trying to regenerate the DPF. I should clean the IAT and the MAF?. The best part is, our Toyota Highlander Air Flow Meter/Mass Air products start from as little as $81. When it happens the car stutters and shuts off. The air intake system from the air filter assembly may have a large leak like a bad vacuum hose, air intake hose, loose hose clamps or other intake leak before the MAF sensor. Mass Air Flow Sensor Symptoms And What Should You Do Signs of failing sensor. Is Your Sensor Still Not Working? If these steps have not helped you identify and isolate the problem, there may well be a problem with your sensor. You really should not have to clean your MAF sensor unless you have gone through a lot of dusty trails and too much oil from the K&N filter has muck up the sensor. The wiring or MAF sensor may be too close to higher voltage consumption components, alternators, ignition wires, etc. That seems too high. I let the car cool overnight with the hood open and then compared IAT, ambient temp. Especially as the MAF has been changed to no effect. The fuel-flow is directly proportional to the MAF reading reported to the Engine Electronics, so if the Fuel-flow is correct, the MAFs are most likely correct too. On a properly functioning sensor, the reading is 0 ohms. The computer may be using the MAP sensor to measure only the positive air pressure coming from a turbocharger or supercharger. The BLM can also show a need for a change in the PCM tune; if the VE tables are set too high (low BLMs) or too low (high BLMs), or if the MAF sensor is miscalibrated. Opinions vary on how often you should clean the mass airflow sensor. The mass air flow sensor is a critical piece of equipment on your air filter. Pro-M EFI Engine Management System for 1979 - 1985 Fox Body Mustang The all new Pro-M EFI Engine Management System for the 79-85 Fox Body Mustang includes our new fully programmable Pro-M EFI processor, tuning software and Fox body Mustang specific engine. 9 when I get really heavy footed. 8/s at idle, increases with revs). The factory maf I still dont' think is good (maybe a bit off and a big slow?), but it reports pretty much flat readings across all the ranges. Spoke to the local Subaru service department and was told this is within the variance. edjack is correct that ambient air temp, barometric pressure, engine speed, engine temp, etc. Sensor Replacement (EEC IV) When any engine sensor is renewed (Ford o/e) it will have gold plated terminals. The sensor directly measures how much air is passing into the engine. The computer tried to compensate, but since resolution is impossible, it sets the code. Reading Diagnostic Trouble Code (DTC) Memory Voltage at hot wire MAF sensor (B2/2) insufficient or too high, or open circuit in ground wire at hot wire MAF sensor. The invention claimed is: 1. Cleaned out throttle body,no vacuum leak. Since the oxygen sensors are telling the computer that less fuel is needed, this causes confusion in the computer because the Mass Air Flow Sensor is still saying there is too much air and the Oxygen Sensor is reporting that the mixture is still too rich. I have ordered a replacement MAF and pre cat O2 sensor. Started to idle high at 2000 to 3000. Scanmaster readings in high gear. 7L engines that use the Bosch hot-wire MAF, if the burn-off cycle after shut-down fails to occur. but from what i gather, you are telling me the new maf i had on my car, the readings were too high, but in reality the car ran perfect with good power and great fuel economy. This one is more for a hunting or erratic idle, the original speech was for a 'shaking' or 'rough' idle. A bad MAF sensor will tend to have positive fuel trims at load. The grams per second at idle should be about 1. The mass air flow sensor should read about 4-7 gm/s at idle to 100 gm/s or more at the time of the 1-2 shift. The codes I initially got were 17535/p1127, 17537/p1129, and 17549/p1141- all rich codes. CEL came on, code for MAF voltage too high, and knock sensor. Intake Air Temp reading 6°F too high. Mass Air Flow Circuit Malfunction Open or short in mass air flow meter circuit with engine speed 4,000 rpm or less. Fuel trims may also be negative at idle with a bad or dirty MAF. If a MAP sensor is not sending the correct signals to the engine computer, an imbalance of pressure may result in rough engine performance. com 1) Caddyinfo Discussion Forum Contribution or Subcription click here. The coolant sensor monitors engine temperature. /Hg shows very high engine vacuum, which jibes with the reported TPS PID. I noticed that some Bosch data sheets show the negative flow reading and some just show the sensor output starting at 1 volt and don't publish the 0-1 volt data at all. A false reading could cause too much or too little fuel to be delivered to the engine. 6 shows fuel trim and volumetric efficiency charts related to the MAF sensor. I had to keep tapping on the gas just to keep if from stalling. Also, I couldn't find any 'fuel temperature reading' so I don't know if that it important or not. This document and the associated downloadable files are meant as an aid to assist you in diagnosing how your Air/Fuel (AF) mixture delivery is performing, and how to use Autotap and a MAF Translator to adjust various parameters. This solenoid is controlled by the logic module. Thing is it must have a low voltage threshold to pick up on the maf. O2 sensor were at like. Intake Air Temperature TOO HIGH. I'll try again tonight. the difference in MAF reading. Some drivers may never notice the loss of engine performance, but those who do notice might come to your shop asking for a "tune-up. Typical changes I have seen from such modification rarely exceed 4 hp at the wheels even on modified V-8 engines. 23 Throttle sensor out of range or throttle set too high 24 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) sensor out of range 25 Knock sensor not tested (ignore if not pinging) 26 Mass Air Flow (MAF) or Vane Air Flow (VAF) out of range Transmission Oil Temperature (TOT) sensor out of range 27 Vehicle Speed Sensor problem. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. You may be right then, perhaps the MAF is getting weak. 6 16v z16xe engine fitted, the problem im having is it idles erratic now and then and sometimes cuts out, it started doing it about every 1000 mile then its got worse until it was about every 30 mile and i got fault code 0130 - low voltage on front lambda, i looked at the live data from the sensor and it was showing very low, i was lucky to have a new sensor so i fitted it. Fitted a new exchange MAF and reset the ECU by disconnecting the battery, and the car ran great had a read of 2. As such they lack a mechanical carburetor and instead split the function of the carburetor into three parts, namely the Air Flow Meter in the air cleaner box, the throttle body and the fuel injector. This is at idle. To be able to compare your fuel-flow readings with other people´s readings, you need to correct the data for temperature, barometric pressure and altitude. Is Your Sensor Still Not Working? If these steps have not helped you identify and isolate the problem, there may well be a problem with your sensor. MAF Sensor Replacement If the sensor is faulty and reading too high, the fan will run at high speed. 0 w/ 117,000 miles. A few miles of that and then it would die at every stop. I checked my readings and at 2800 RPM, I am reading 3-4 lbs/min. Here the PCM/ECM is basing fuel delivery on feedback from the MAF sensor and assumes the reading is accurate. I got a Check Engine Light, which the code was the MAP Sensor. P0104 - Mass or Volume Air Flow A Circuit Intermittent/Erratic. Your car has a lot of sensors, and this is just one that helps your car run properly. Found air cleaner plugged and maf very dirty. 5-3 g/s in VAG COM whilst logging the MAF at Idle. gives me a code that signal is too high. I was trying to figure why the ambient is reading hotter than the outside air, is there a sensor or does the pcm figure it some how. The most widely recognized is the mass air flow sensor (MAS or MAF). 2 to 6 is correct MAF reading for warmed up idle, remember it's calculated PCM looks at IAT and MAS (sensor frequency) to calculate the weight of the air in grams per/sec. With the engine not even running, it reads 3. For Figure B. 5 volts with engine running (R). And this damn code just started popping up at the same time that she's been running wierd on cold starts. Page 1 of 6: Symptoms of a BAD IAT Sensor. Basically, it indicates that the Oxygen Sensor (O2) reading is above the normal range, This sensor for a long time has had too high a voltage and does not switch over again. i have a 2002 gmc duramax lb7 setting dtc p0101 code at idle. Someone else thinks maybe the MAF is getting condensation The dealer thinks the MAF is OK. When found in NAR (North American Region) 2011-2013 Jetta, Golf, Passat and New Beetle vehicles with 2. If you have a backflow issues (high backpressure) or even a timing issue where the valves are not opening and closing at the correct time (slack chains, jumped timing), your MAF sensor readings will reflect this as well. Check sensor output wire for possible grounding. Mechanics measure and the mass air flow sensor readings at different RPMs. They should match within. This time more conventional but with a twist. In this article, I'll show you how to test the mass air flow (MAF) sensor on your GM 3. Here the PCM/ECM is basing fuel delivery on feedback from the MAF sensor and assumes the reading is accurate. The grams per second at idle should be about 1. Buy a 2007 Volkswagen Jetta Air Mass Sensor at discount prices. A constantly under reading EGR (MAF) value may be due to a faulty AMM (MAF) or the EGR valve is. 9 AFN engine (1996). P0102 MAF Signal Low Input to PCM. Therefore, on average you are expected to pay $200 to $400 in total for a mass air flow sensor replacement. This table is used to lookup the Airflow (g/sec) value for a given frequency and ultimately calculate the Airmass (g/cyl. Verify the integrity of the air induction system by inspecting for the following conditions:. at higher RPMs is an indication of a contaminated MAF sensor. Unfortunately this can be tough if the MAF sensor is located too close to an elbow, or the filter is too close etc, MAF sensors need very laminar streamlined flow to read correctly. code still coming up after eras. A difference of more than a few degrees indicates a problem. This combo may also be found in setups where a larger MAF may become too turbulent at low load, and the MAF is used at high load for more accuracy in a naturally. If the sensor is connected properly, both electrically and to the intake manifold, use a scan tool or voltage meter and vacuum gun to check MAP sensor output. Have you looked at the MAF reading in the. In either case, the sensor may be at fault. Spoke to the local Subaru service department and was told this is within the variance. For Figure B. How to clean mass air flow sensor video. 9 when I get really heavy footed. If it is a sensor, I'm not sure what you have, as the IAT sensor is embedded inside the MAF sensor, which is sold as a whole part and is located in the air filter assembly. Basically, the MAF sensor—also known as airflow meter—measures the amount of air flowing into the engine through the air cleaner assembly, which contains the air filter and connects to the throttle body. 8L (3800) vehicle without a scan tool. However, it can only deliver these qualities because of the refinement and sophistication of its turbodiesel engine engine and control systems. On GM MAF sensors, there are a couple of quick checks you can do for vibration-related sensor problems. Voltage to Mass Air Flow sensor on 99 V70XC. 7 volts is considered too high, 1 volt would certainly need regenerating and anything more than 1. When you have a bad oxygen sensor, your vehicle will run less efficiently, it can sometimes have a poor idle, erratic jerking at steady throttle, hard starting problems, cause the check engine light to come on, and will cause high fuel consumption. 8 liter turbo V6. The MAF sensor may need to be cleaned to achieve the proper reading. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. Too little exhaust causes more air to be ingested by the engine due to lack of exhaust gas dilution, and the MAF sensor is measuring this increased air flow. Causes of EEC-IV, OBD I Code 125: This In-Range Self-Test was designed to identify Air bypass solenoid high/stuck open (MAF may in-range concerns of the MAF sensor, TP sensor, or indicate high during this event). Voltage to Mass Air Flow sensor on 99 V70XC. Check the fuel pressure. This article applies to the Chevrolet Silverado GMT800 (1999-2006). DTC stored. 8L (3800) vehicle without a scan tool. Which seems way too high but I cant find anywhere on what it should be at. Diagnostic Codes P0171 Confirmed Fix 225 - Mass Air Flow (MAF) Sensor 9 - Engine Air Filter, Mass Air Flow (MAF) Sensor 4 - Oxygen (O2) Sensor(s) 2 - Fuel Pump. p0105-inlet pressure sensor signal plausibility. I performed a KAM reset to return the alcohol content to zero, and I left the fuel pump jumpered to high-speed mode. Malfunction leads to increased levels of hydrocarbons and carbon monoxide. Gday guys after adjusting boost, fitting new exhaust, intercooler, EGR block and a whole bunch of other mods I have been getting issues with my MAF sensor voltage Spiking slightly too high causing the car to go into a momentary limp mode, usually at the worst times(up a hill or overtaking). It is a good idea to log your engine when it is healthy so that you have something to use for comparison when your car is not healthy. I got a diagnostic at autozone and got the code p0171 system too lean bank 1. However, some vehicles that have both types of sensor respond better treating the MAP, so if your vehicle has both sensor types, and your treatment of the MAF hasn't gotten you results, try the treating the MAP instead.