MAF Sensor Circuit Wiring Diagram (1994-1995 3.1L V6 Buick Century)

APPLIES TO: This MAF sensor circuit wiring diagram applies to the following vehicles:

• 3.1L V6 Buick Century: 1994, 1995.

MAF Sensor Connector Pinout

Terminal	Wire Color	Circuit Function
A	Yellow (YEL)	MAF Signal Output To PCM
B	Black with white stripe (BLK/WHT)	Chassis Ground
C	Pink (PNK)	12 Volts From The ECM (15A) Fuse

Basic Operating Theory Of The MAF Sensor

The mass airflow (MAF) sensor measures the amount of air entering the engine. The fuel injection computer (PCM) uses this information to calculate how much fuel the engine needs under every operating condition.

Inside the MAF sensor are two heated wires. As air flows through the sensor, it cools these wires. The greater the amount of airflow, the more the wires are cooled.

The MAF sensor continuously monitors this cooling effect and converts it into a digital frequency (Hertz) signal that it sends to the PCM. As engine airflow increases, the frequency of the signal increases. As airflow decreases, the frequency decreases.

On the 1994-1995 3.1L V6 Buick Century, the PCM uses this MAF signal as one of its primary inputs for calculating fuel injector pulse width. An inaccurate or missing MAF signal can cause a variety of driveability problems, including poor acceleration, rough idle, hard starting, increased fuel consumption, and an illuminated check engine light.

One of the nice things about this MAF sensor is that you don't need an expensive scan tool to verify that it's working. Since it produces a frequency (Hz) signal, you can test its output with a digital multimeter that has a Hertz (Hz) function. As you accelerate the engine, the frequency reading should increase. As the engine returns to idle, the frequency should decrease.

MAF SENSOR TEST: How To Test The MAF Sensor (1994-1995 3.1L V6 Buick Century).

More 3.1L V6 Buick Century Tutorials

You can find a complete list of 3.1L V6 Buick Century tutorials and wiring diagrams in this index:

• 3.1L V6 Buick Century Index of Articles.

Here's a sample of the tutorials you'll find in the index:

• How To Test The TPS With A Multimeter (1997-2005 3.1L V6 Buick Century).
• Common Causes Of Spark Plug Failure (1994-2005 3.1L V6 Buick Century).
• How To Test For A Blown Head Gasket (1994-2005 3.1L V6 Buick Century).
• How To Test Engine Compression (1994-2005 3.1L V6 Buick Century).