Q: What value should the MAF signal be at idle?

asked by on

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

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What value should the MAF signal be at idle?

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

Get a quote

What others are asking

Q: Car cannot pick up fuel

The first step is to check fuel pressure at the fuel rail. For your vehicle, pressure should be 30 to 40 PSI while running and 35 to 45 PSI with the engine off. Since you've already replaced the pump, if...

Q: How to change from 2lt engine to a V8 please?

Basically, you will have to change just about everything in the drivetrain and there will be quite a few places to reinforce since the vehicle was designed to handle the torque output from a 4 cylinder engine. This swap is...

Q: Can I used an ignition coil with the primary resistance per spec but the secondary with lower resistance.

Hi there. To properly repair your vehicle you need to use the correct ignition coil. If you do not use the right coil then it either will not work or it can damage the circuit and the computer. The resistance...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.