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I got a static 'signal' on the ground pin of 2.7V which didn't change when air blew past it. I later found the right pinout here. That pinout is different; 12V, signal, and ground from left to right. So i formerly had the MAF hooked up with signal pulled to ground, while measuring the ground pin. Nov 24, 2020 · The engine needs an air/fuel mixture of 14.7:1 for the best engine performance and fuel mileage. The mass air flow (MAF) sensor and oxygen (O2) sensors measure this ratio. If air manages to get into the intake and pass the MAF sensor without a reading, it will throw the ratio off and trigger a check engine light. Here is a video on how you can test your MAF Sensor using a basic $5 Multimeter. I also show you how you can figure out the wires without a wiring diagram.I am trying to use an 05 GTO maf with my 98 wiring harness. Does anyone know where I can find a wiring diagram? A YEL 492 Mass Air Flow (MAF) Sensor Signal B BLK/WHT 451 Ground C PNK 539 Ignition Feed.Toyota / Lexus - The hot-wire MAF sensor is notoriously susceptible to oil contamination and aftermarket air filter contamination. Cleaning may work, but replacement of the MAF sensor and an OEM (original equipment manufacturer) air filter are a sure fix.J4: MAP Sensor Selection When this jumper is installed in the default location, the internal 4-bar MAP sensor will be used. If the jumper is moved to the location labelled "EXT", an external MAP sensor wired into the rear option connector will be used. Sep 10, 2013 · 240SX Wiring Diagram ( ZENKI – Automatic – F4 Plug ) Let’s take a look at the F4 body plug found on your 1995-1997 S14 Nissan 240SX, and there are 3 sections to this body harness, which will will review. You will see the 2 ground wires to the left on this diagram for the ground wires leading to your LS1 sensors. Measuring a hot wire mass air flow (MAF) sensor. Sensor information. Type: Hot wire. Power supply: 12 V from system relay and ground. The Mass Air Flow (MAF) sensor measures the amount of passing air going through the air intake system.Of course, backprobing the MAF sensor connector for voltage drops at both the power and ground terminals KOER is a required step before any final condemnation. A bad Bosch hot-wire MAF sensor may be the result of a failed burn-off circuit.A firewall sensor mounting with a down-facing port is recommended. This simply connects to the plenum via a hose after the throttle body or blower. The MAP sensor should sense the pressure the intake ports “see.” 9. The air temperature sensing in the stock applications was primarily done in conjunction with the MAF sensor, but i have my power wire tapped into a switched 12v and the 2 ground wires to the chassis/frame. at idle and cruise the AFR fluctuates back and forth 14.7 as it should but as i increase the gas pedal and get into PE/WPT the readout then goes to 16.00 and stays there. the vehicle is a 01 camaro z28. the sensor’s in the passenger side B1S1 O2 bung. 3-Wire GM Mass Air Flow (MAF), Crank and Camshaft Sensor Connector (Metri-Pack 150 Series) 1988 and Newer. Replaces GM #12085495, #15305987, #15306120, #88986451 and AC-Delco #PT117, #PT1120, #PT1281 and #PT1604. Connected to the MAF Sensor Burn-off Relay terminal B (Design 1) or F (Design 2). The MAF Sensor uses a hot-wire to determine air flow by measuring the current required to maintain this thin wire at a constant temperature as intake air flow passes over it. Due to contaminants which are always present in the atmosphere, a residue may build up on ... The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases.