Q: What value should the MAF signal be at idle?
I'm testing the mass air flow sensor, what is the known good spec for the signal to the ECU at idle?
My car has 212000 miles.
My car has an automatic transmission.
Here is a breakdown of the wiring color codes, and the associated voltages on each, for engine running and ignition on. The signal from the mass airflow sensor should steadily sweep from 1.9 to 5 volts as you press and release the gas pedal.
TERMINAL
B/Y (Power supply) G/O (Burn-off) G/B (Air flow mass) G/Y (Ground) B/O (Ground)
IGNITION ON
B/Y - Approx. 12V G/O - 0V G/B - 1.0 - 2.0V G/Y - Approx. 0V B/O - Approx. 0V
ENGINE RUNNING
B/Y - Approx. 12V G/O - 0V G/B - 1.9 - 5.0V G/Y - Approx. 0V B/O - Approx. 0V
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
The Check Engine light is on. I know the vehicle needs a new catalytic converter.
If someone has already diagnosed that the catalytic converter is faulty on your vehicle and you know they are correct, that is the cause of your check engine light. Your oxygen sensors pick up more fuel in the exhaust when...
A fuse blows when power seats are used
The power seat motors on your 2004 Kia Amanti have only one fuse, and it is a 30 amp fuse. If you replace this fuse (https://www.yourmechanic.com/services/fuse-replacement), and it blows when you try and operate the seat then there is a...
My car key is stuck in the ignition
Hi there: There are a few things you should try. First, try to wiggle the steering wheel slightly as you try to push the key forward or all the way back. It's possible the steering wheel is locked which is...
Some one put sugar in my 2000 Ford Taurus and I didn't know I ran my car for a little while until it started to turnLike when r u
The first thing to do is to remove the fuel tank and fill tube. Have the tank and tube flushed out. Replace the fuel filter and disconnect all the lines and flush all the lines out with water and then...
Warranty information from Your Mechanic
Question sent to CS about extended warranty honored.
How long does it take to install a block heater?
Hi there. Installing a block heater for your vehicle depends on what type of heater you are installing. Some heaters are externally mounted to the bottom of the engine oil pan and other heaters are inside the engine oil pan....
Rough idle when cold
Hello, As a general rule, car engines do not like cold weather and will generally require more fuel in cold operating temperatures. When you start your car in the morning and turn the key to on, the coolant temperature sensor...
i think my gear shift is broken because it is very loose. and car won't start
It's possible the linkage, or cable, is faulty which could explain the no start because if the linkage is not in the proper position the neutral start safety switch might not work. To determine the exact problem, please request a...
I asked yesterday with no response vfrom Your Mechanic. I too have the intermittent Airbag light on. I'd like a quote.
The warning light signifies a fault in the air bag control system. The recall that you are referring to addresses a circumstance where the Occupant Restraint Control (OCR) module on the recalled vehicles (your model year is included, but check...
Related articles
Can a Bad Sensor Prevent a Car From Starting?
If your car isn't starting or has a hard time starting, a faulty sensor may be to blame. Car sensors monitor data to keep your car running smoothly.
What Does the Mass Airflow Sensor Do?
How How often does the mass airflow sensor need to be replaced? Mass airflow sensors (MAF) have no expiration date. They are not included on the manufacturer’s scheduled maintenance list of things to replace based on mileage, like spark plugs...
How Are Sensors Used to Improve a Car’s Performance?
Modern vehicles utilize a series of car sensors to improve performance and reduce emissions. The oxygen sensor helps reduce tailpipe emissions.
Browse other content
Estimates
Maintenance
Cities