MAF sensor

[Finkle]

today i got a dtc code it was 0102 MAF sensor voltage signal is low, now what does that mean, how can i correct it?
any help would be great

[Sparky2263]

CIRCUIT DESCRIPTION
The Mass Air Flow (MAF) sensor is an air flow meter. The control module supplies the MAF sensor a signal circuit. An ignition positive voltage circuit and a ground circuit are supplied to the MAF sensor by independent circuits. The MAF sensor heats a wire element, or grid, within the MAF sensor in order to maintain a calculated temperature. As inlet air flows across and cools the grid, the MAF sensor increases current flow to the grid in order to maintain the constant grid temperature. The MAF sensor converts the grid current flow into a frequency signal. The control module converts the MAF signal frequency into a grams per second value. During low air flow rates, such as at engine idle, the MAF sensor produces a low frequency signal. During high air flow rates, such as at wide open throttle-road load, the MAF sensor increases the frequency signal. The control module monitors the MAF sensor signal frequency in order to calculate the flow and mass of the air entering the engine.

This DTC is designed to detect an unusually low MAF sensor signal frequency. If a MAF sensor frequency is detected by the VCM below the possible range of a normally operating MAF sensor, this DTC will be set.

CONDITIONS FOR RUNNING THE DTC


The engine is running.
The engine speed is more than 300 RPM .
The system voltage is more than 8 volts .
CONDITIONS FOR SETTING THE DTC
The MAF frequency is 10 Hz or less for more than 1 second .

ACTION TAKEN WHEN THE DTC SETS


The control module illuminates the Malfunction Indicator Lamp (MIL) if a failure is detected during 2 consecutive key cycles.
The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool Freeze Frame and Failure Records.
CONDITIONS FOR CLEARING THE MIL OR DTC


The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.
Use a scan tool in order to clear the DTCs.
DIAGNOSTIC AIDS
Check for the following conditions:


A misrouted harness - Inspect the MAF sensor harness in order to ensure that it is not routed too close to high voltage wires such as spark plug leads.
A damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving the connectors and the wiring harnesses related to the MAF sensor. A change in the display indicates the location of the fault.
A plugged intake air duct or filter element. A wide open throttle acceleration from a stop should cause the mass air flow (MAF) displayed on a scan tool to increase from about 4-7 g/s at idle to 100 g/s or more at the time of the 1-2 shift. If not, check for a restriction.
An intermittent may be caused by any of the following conditions:


A poor connection
Rubbed through wire insulation
A broken wire inside the insulation

[Sparky2263]

Most likely a very dirty sensor. K&N filters are famous for causing this code.

Make sure the pink wire has 12v and the Blk/Wht wire has a good ground.

[Finkle]

so how would i go about cleanin the sensor

[Sparky2263]

Electronics cleaner from Radio Shack seems to be the cleaner of choice. I use carb clean but lots of people seem to have an issue with this.

[Finkle]

so i just spray it all over the coils inside, do i wipe it off or just let it air dry???
dont need anything else to screw up

[Sparky2263]

Yes, you want to shoot it over the wires in order to clean accumulated oil and debris off them. It dries very quickly and will be completely dry by the time you start the truck up.

Did you ck. for good power and ground? First thing I'd do.

[slowzq8]

you don't want to touch the "element" (i don't know what else to call it). you will do more harm than good if you touch it.

[Finkle]

awesome well i haven't checked the power or grounds yet, i was gonna do that today. But i was driving by a construction site and the stupid b*tch lady that was in charge of putting all the signs up never put up any big bump sign or anything, so i was driving behind this big f-150 not being able to see anything doin about 30km/h and i nailed this bump in the road and blew out 3 of 4 tires possibly all 4.
gotta look after all that first

[Sparky2263]

jeez.........That was a helluva bump!

[dtl379]

And I thought our roads and construction crews were bad in Rochester NY! Check your suspension while your at it, make sure nothing else blew. My brother launched my dads car once and did 350 in damages just to the front end.

[Finkle]

its still gotta go to the shop and get the suspension and everything looked at. Now i just cant wait to hear the lady's excuse to why my tires popped

[dtl379]

Let us know how it goes. The lady will probably tell you that she doesn't know why they tires popped. Or that your tire pressure was not right for the weight of the truck, or they are not ment to be driven on that type of pavement. People have come up with some interesting answers when they don't want to admit fault.