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These are the vane meter and the hot wire. A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. Determine the cause of the restricted oil line. Component identification on the C13 and C15 engine. Not all HFM systems output a frequency. Verify that the CGI flow is within the acceptable range during the test. Install a tee at both ports of the actuator. Run the "Air System Verification Test". Some VAF sensors include an additional intake air temperature sensor (IAT sensor) to allow the engines ECU to calculate the density of the air, and the fuel delivery accordingly. A Kármán vortex sensor works by disrupting the air stream with a perpendicular bow. Look for cuts or other damage. Carefully follow this procedure in order to identify the root cause of an intermittent wiring problem. This code indicates that the current flow through the electrical circuit for the control group is excessive. This sensor uses a hot film-grid instead of a hot wire. In situations where owners use oiled-gauze air filters, it is possible for excess oil to coat the MAF sensor and skew its readings. A snapshot is triggered. Adjustments to the fuel mixture are necessary to keep a vehicle running smoothly. Inspect the small rubber hoses near the sensors for the CGI system. CGI Absolute Pressure - This is the absolute pressure of the clean gas in the duct. Replace valve assembly (4) if the flapper rotates smoothly. The ECM continues to attempt to control the actuator.    , CGI Actuator Shaft Position : Current Above Normal    , This code can be activated only when the ECM is sending a command to the control group. Also see manifold absolute pressure sensor (MAP sensor). The ECM creates a pulse width modulated signal (PWM) that indicates the amount of clean gas that is desired. Two pressure taps on the venturi provide connection points for tubing. Note: Troubleshoot a -5 code or a -6 code first if more than one code for the CGI system is logged. The inlet pressure is significantly less than the engine oil pressure reading on Cat ET. The use of an oscilloscope is strongly recommended to check the output frequency of these sensors. Verify that the CGI flow is within the acceptable range during the test. The best way to track it down is to follow the small CGI lines from under the turbos that connect to the big CGI line. This is achieved by heating a wire suspended in the engine’s air stream, like a toaster wire, by applying a constant voltage over the wire. Run the "Air System Verification Test". Repair: Carefully clean the venturi. The clean gas induction (CGI) system routes clean gas from the outlet of the Diesel Particulate Filter (DPF) to the inlet of the turbocharger. The original -5 code was caused by a poor electrical connection. Some of the benefits of a hot-wire MAF compared to the older style vane meter are: The GM LS engine series (as well as others) use a coldwire MAF system (produced by AC Delco) that works similarly to the hot-wire MAF system; however, it uses an additional "cold" resistor to measure the ambient air and provide a reference for the "hot" resistor element used to measure the air flow.[4]. Technological progress allows this kind of sensor to be manufactured on the microscopic scale as microsensors using microelectromechanical systems technology. Or a leak or restricted in the small lines that connect to the big CGI line near what is called the Venturi. During normal engine operation, the ECM commands the flapper to a position that results in the desired flow of clean gas. The wire's electrical resistance increases as the wire’s temperature increases, which varies the electrical current flowing through the circuit, according to Ohm's law. in some manufacturers fuel pump control was also part on the VAF internal wiring. It consists of a tubular housing with flow straightener, sensor protection, and sensor module. 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Run the "Air System Verification Test". The current increase or decrease is proportional to the mass of air flowing past the wire. Carefully inspect the terminals in each connector for proper installation. Test Step 3. Inspect the piping between the outlet of the DPF and the venturi. Actuator - The actuator uses pressurized engine oil to convert the coil's magnetic field to rotation of a shaft. MASS AIR-FLOW SENSOR, MERCEDES E-CLASS -13 ; E 350 350 CGI/276.952 AUT/722906 4DR SEDAN BENSIN ; BENSIN BOSCH ; Atracco AB - Helsingborg, 042-158840 ; A2760940148; 350 CGI/276.952; OK; Utan anmärkning (A) 2009 - 2017; 5.808; 1.245 SEK ; Read more; W842015; Begagnad; Save part The thin-film and membrane technologies incorporate highly accurate temperature sensors and heaters as core elements on the sensors. Verify that each socket grips the pin firmly. As can be seen clearly, the specified air flow is much higher than the actual (measured) air flow. However, a traditional mass flow meter is expensive to purchase and install. Figure 5.23: Impact-based mass flow yield monitor performance in uncontrolled data ..... 97 Figure 5.24: Average impact-based mass flow sensor response in uncontrolled data..... 98 Figure 5.25: DEM analysis of the modified fountain auger with simulated grain Connect the coil to the harness. It indicates a low cgi gas supply. (See stoichiometry.). The frequency of the resulting pattern is proportional to the air velocity. Mass flow is a dynamic mass per time unit measured in grams per minute (g/min). Check the Wiring for Problems. Note: The communications adapter must be communicating on both data links in order to perform this procedure. Indeed, General Motors has issued a Technical Service Bulletin, indicating problems from rough idle all the way to possible transmission damage resulting from the contaminated sensors. At the heart of every mass flow sensor is a MEMS based calorimetric microsensor, which measures the gas flow using the thermal measurement principle. They will run around the back of the engine. Mass airflow sensors (MAF) have no expiration date. JDMON Compatible with Mass Air Flow Sensor Meter MAF Nissan Infiniti Altima Frontie G37 G35, Xterra 05-15/ Sentra 07-13 3.7L 09-15 /Rogue 2.5L 2008-2015 Replaces 22680-7S000 3.5 out of … [3] It is commonly found in late 1980s and early 1990s fuel-injected vehicles. Observe the pressure readings on the gauges. Repair: Replace the damaged parts. Inspect the wiring between the P2 connector and the harness connector for the coil. Troubleshooting Mass Air Flow (MAF) Sensors Because calibration errors tend to be “gray-area” types of problems, we will begin by looking at the basics of how a “hot-wire” MAF sensor measures airflow through an engine running at various speeds and loads. Remove any debris from the inlet screen. Test Step 9. The tricky thing with some of these types of faults is that you can have a mass air flow sensor concern without triggering the check engine light. A vehicle’s mass airflow sensor, or MAF, is the component that measures the flow and density of the air flowing into the combustion chamber. The vane moves because of the drag force of the air flow against it; it does not measure volume or mass directly. Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. It is mounted in the intake pipe between the air filter housing and the intake manifold. CGI Differential Pressure - This is the pressure drop across the venturi. Sensors - Three sensors sense the parameters of the clean gas. Determine if the CGI flow is high. by Alibaster Smith. This code indicates that the current flow through the electrical circuit for the control group is low. CGI Absolute Pressure - This is the absolute pressure of the clean gas in the duct. Run the "Air System Verification Test". Tubing - Tubing connects the venturi's pressure taps to two pressure sensors.    . 100-1 Engine Oil Pressure : Low - Most Severe (3), 100-17 Engine Oil Pressure : Low - Least Severe (1). Unlike the vane meter's paddle sensing element, the hot wire responds directly to air density. This system then controls the amount of fuel that is injected into the cylinders, so that the ideal fuel-to-air ratio is achieved. Verify that the CGI flow is within the acceptable range during the test. This screw controls the air-fuel mixture by letting a metered amount of air flow past the air flap, thereby leaning or richening the mixture. This condition may cause other problems with the CGI system. Test Step 4. The ECM uses the signals to determine the mass of the clean gas that is flowing into the turbocharger. The air-mass sensor is used to measure the intake air mass. Additionally, one of the following codes is active: 3473-31 Aftertreatment #1 Failed to Ignite It’s a critical engine performance component, so if it fails or begins to … Since around 2012, some MAF sensors include a humidity sensor.[1]. Determine if either of the following codes are logged: Test Step 6. Components : (1) Mass Air Flow Sensor, and (1) Mass Air Flow Sensor Boot Configuration : 3-Prong Blade Male Terminal; 1 Female Connector Quantity Sold : Set of 2 Warranty : 1-year DriveWire unlimited-mileage warranty Prop 65 Warning : . The vane meter approach has some drawbacks: A hot wire mass airflow sensor determines the mass of air flowing into the engine’s air intake system. Such a microsensor reaches a significantly higher speed and sensitivity compared with macroscopic approaches. The drag force depends on air density (air density in turn depends on air temperature), air velocity and the shape of the vane, see drag equation. However, for two-phase flow inlet conditions, the resulting RMS of 1.0 g/s for the 8-PI correlation is sufficiently small to use the approach for estimating the refrigerant mass flow and using the EXV as a virtual flow sensor. The vane moves in proportion to the airflow. They can remain in service indefinitely as long as they continue to function correctly. Instead, the liquid phase of MAF sensor cleaners and electronics cleaners is typically based on hexanes or heptanes with little to no alcohol content and use either carbon dioxide or HFC-152a as aerosol propellants. The Innovative Sensor Technology IST AG thin-film mass flow sensors offer solutions for a wide variety of flow applications. The code is logged. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced … The sensors should be gently sprayed from a careful distance to avoid physically damaging them and then allowed to thoroughly dry before reinstalling. CGI Mass Flow Rate : High - Least Severe (1) The flow of clean gas is consistently excessive. The flapper is connected to the actuator's shaft. Engine power is derated. The ECM uses the signals to determine the mass of the clean gas that is flowing into the turbocharger. Refrigerant mass flow rate is an important measurement for monitoring equipment performance and enabling fault detection and diagnostics. Determine the logged code for the CGI system. It is not used for measuring the air flow per se. Check for a Code for Low Oil Pressure. Verify that the engine is OFF and that the keyswitch is ON. In some cases, this sensor works by outputting a regular varying voltage signal. The sensor is on the drivers side of the engine under the crankcase breather canister. Repair: Repair the wiring, when possible. The code is logged. Mass air flow sensors are one of the essential components of an electronic fuel injection systems. A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. The mass air flow sensor (MAF) is used to measure the amount and temperature of air that is entering the engine at any one time. Run the "Air System Verification Test". Yes the engine will be derated when this code is active. TE Connectivity (TE) manufactures reliable and accurate mass air flow (MAF) sensors for a variety of automotive, medical and industrial gas flow … Electrical wiring sends the signals from the sensors to the Engine Control Module (ECM). Laminar flow elements are usually constructed from a large number of parallel pipes to achieve the required flow rating. The code is logged. Your Mass Air Flow Sensor (MAF Sensor) is a piece of technology within your engine which tells your car’s computer how much air is entering the engine. The air mass details are required in order to balance correct amount of fuel mass to the vehicle engine. Verify that the -5 code does not return. The first type can only be used in pull-thru air (prior to a turbo- or supercharger), while the second type could theoretically be used push- or pull-thru air (before or after a forced induction application like the previously mentioned super- or turbocharger). This is important as it allows your engine to regulate its performance and change the intake of air to keep your engine running in its best condition. Refer to Troubleshooting, "Oil Pressure Is Low". It helps the car’s computer regulate the ratio of air to fuel. Frequency distortion is also common when the sensor starts to fail. The mesh on the MAF is used to smooth out airflow to ensure the sensors have the best chance of a steady reading. Run the "Air System Verification Test". To clean the delicate MAF sensor components, a specific MAF sensor cleaner or electronics cleaner should be used, not carburetor or brake cleaners, which can be too aggressive chemically. The sensor group produces electrical signals that indicate the values of the following parameters: CGI Temperature - This is the temperature of the clean gas in the duct. Mass Air Flow Sensor Description & Related Information Check engine light faults relating to the Mass Air Flow Sensor are becoming less common, but do occur. Remove the jumper wire. The code is logged. Unbolt the actuator from the valve assembly. How a Mass Airflow Sensor Works Mass Air Flow Sensor Diagram . Establish communication between the Caterpillar Electronic Technician (ET) and the engine ECM. The flow of clean gas is consistently excessive. There are several sensors there. Air changes its density with temperature and pressure. Run the "Air System Verification Test". For effective flow energy management applications, like compressed air and natural gas measurement, thermal mass flow meters give you the answers with the highest accuracy +/- 0.5% of reading, stable Dry Sense sensor technology, in situ field calibration, and software app to … Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post on-board diagnostics (OBDII) vehicles. Replace actuator (6) if the flapper does not rotate smoothly. This type of MAF can be found on all DSMs (Mitsubishi Eclipse, Eagle Talon, Plymouth Laser), many Mitsubishis, some Toyotas and Lexus, and some BMWs, among others.[6]. When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The actuator's shaft does not rotate smoothly during the test. Laminar flow elements measure the volumetric flow of gases directly. The outlet pressure is less than 35 kPa (5 psi). cgi mass flow rate low on c7 no leaks were found and sensors are working but no air detected at the venturi at the tubing The code is logged. All names, descriptions, numbers and symbols are used for reference purposes only. Look for these problems: Disconnect the connectors for the coil. The names Caterpillar, John Deere, JD, JCB, Hyundai Then, perform the "Air System Verification Test". The membrane has a thin film temperature sensor printed on the upstream side, and one on the downstream side. By turning the screw clockwise the mixture is enriched and counterclockwise the mixture is leaned. Replace the venturi, if necessary. responds very quickly to changes in air flow, less sensitive to mounting location and orientation. [2], If air density increases due to pressure increase or temperature drop, but the air volume remains constant, the denser air will remove more heat from the wire indicating a higher mass airflow. Verify that the CGI flow is within the acceptable range during the test. They are not included on the manufacturer’s scheduled maintenance list of things to replace based on mileage, like spark plugs or filters. The shaft is connected to the valve assembly. They are extremly reliable and long-term stable and are free from zero-point drift. Continue with this procedure after the low oil pressure condition is resolved. A snapshot is triggered. The sensor pictured on the right, converts air flowing past a heat sensing element into an electrical signal. The flapper moves in order to vary the amount of clean gas that flows into the turbocharger. The viscosity of the fluid must be compensated for in the result. Check the Wiring for a Short Circuit, Test Step 5. conditions in the open literature. An example is 1994 Infiniti Q45. A snapshot is triggered. Replace parts, if necessary. The coil creates a magnetic field that is detected by the actuator. Run the "Air System Verification Test". A mass flow sensor is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. Also, you may also want to inspect all of the cgi lines for leaks. Connect an oil pressure gauge to each tee. Verify that the problem is resolved. Carefully inspect inlet screen (9). Although types and designs of sensor may differ to enhance engine performance under particular conditions, the mass air flow sensor is a critical component in the supply of information to the on-board computer establishing the proper fuel levels to … The hot film MAF sensor works somewhat similar to the hot wire MAF sensor, but instead it usually outputs a frequency signal. However, with additional sensors and inputs, an engine's ECU can determine the mass flow rate of intake air. Check the Operation of the Actuator. These sensors tend to cause intermittent problems due to internal electrical failures. Our mass flow meters ensure fast, accurate and economical measurements of gas flow over a wide dynamic range.

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