APPLIES TO: This manifold absolute pressure (MAP) circuit wiring diagram applies to the following vehicles:
- 2.2L Buick Century: 1993.
Basic Operating Theory Of The MAP Sensor
The manifold absolute pressure (MAP) sensor measures the amount of pressure (or vacuum) inside the intake manifold and sends this information to the fuel injection computer as a voltage signal.
The PCM supplies the MAP sensor with a 5-Volt reference signal and Ground. As engine load changes, the pressure inside the intake manifold changes, causing the MAP sensor's voltage signal to increase or decrease.
When engine vacuum is high (such as at idle or during deceleration), the MAP sensor produces a low voltage signal. When engine vacuum drops (such as during heavy acceleration or wide-open throttle), the sensor produces a higher voltage signal.
The PCM uses this changing voltage signal to calculate engine load so it can deliver the correct amount of fuel and adjust ignition timing. It also uses the MAP sensor to determine barometric pressure at startup, allowing it to compensate for changes in altitude.
Since the MAP sensor is one of the primary engine load sensors, an incorrect voltage signal can cause driveability problems and may set diagnostic trouble code 33 or 34.
MAP SENSOR TEST: How To Test The MAP Sensor (1993-1996 2.2L Buick Century).
Other MAP Sensor Wiring Diagrams
- MAP Sensor Circuit Wiring Diagram (1994-1995 2.2L Buick Century).
- MAP Sensor Circuit Wiring Diagram (1996 2.2L Buick Century).
More 2.2L Buick Century Tutorials
You can find a complete list of 2.2L Buick Century tutorials and wiring diagrams in this index:
Here's a sample of the tutorials you'll find in the index:
- How To Test For A Blown Head Gasket (1993-1996 2.2L Buick Century).
- How To Test Engine Compression (1993-1996 2.2L Buick Century).
- How To Test The TPS With A Multimeter (1993-1996 2.2L Buick Century).
- Common Causes Of Spark Plug Failure (1993-1996 2.2L Buick Century).
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