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Diagnosing: Manifold Absolute Pressure (MAP) Sensor

MAP Sensor Tech Tips

Text on Screen: Helpful tips to consider when replacing a MAP Sensor

VO: A MAP Sensor is a Manifold Absolute Pressure Sensor. It is going to measure the amount of absolute pressure inside the intake manifold or the amount of vacuum.

Now, I know most engines will have between 18 and 23 inches of vacuum. As the throttle opens up, the vacuum is going to drop.

Now, the PCM is going to use inputs from the sensor to determine how much fuel needs to be added. So, this will be installed into the intake manifold.

Text on Screen: Ensure the power and ground are present, as well as an operative signal line to the PCM.

VO: And, we’ve got three terminals here, with a power ground and a return signal to the PCM. Now, if you’re going to replace one of these, make sure that power ground, and you have a good return signal line to the PCM that working.

Text on Screen: Ensure there is proper manifold vacuum to the MAP Sensor.

VO: Also, make sure that there is no vacuum leaks. And that there is no restrictions in the passage way here. All good things to remember when replacing your MAP Sensor.

Text on Screen: Motorists: If this job is beyond your skill level, visit your automotive service professional. This video is for general information purposes only. The provider makes no representations or warranties as to the information contained in this video or its usage, completeness, quality or accuracy. Any use of such information is at the user’s sole risk, and in no event shall the provider be liable for any consequential, incidental, special, punitive or direct or indirect damages arising from such use.


What does a Manifold Absolute Pressure (MAP) Sensor do?

photo of manifold absolute pressure or map sensor, NAPA Manifold Absolute Pressure Sensor CRB227024

The MAP sensor converts engine vacuum or manifold pressure to an electrical signal so the powertrain control module (PCM) knows how much load the engine is under. This data is the basis for fuel delivery and timing control.

Will a malfunctioning Manifold Absolute Pressure (MAP) Sensor affect vehicle operation?

Yes, a failing sensor can illuminate the check engine light or malfunction indicator lamp, and may cause the engine to have a rich or lean fuel mixture condition which will commonly affect engine performance.

What are the common causes of Manifold Absolute Pressure (MAP) Sensor failure?

Typically these sensors fail due to moisture entering the sensor when the engine is off and due to normal wear of the sensor element.

How to determine if the Manifold Absolute Pressure (MAP) Sensor is malfunctioning?

The Diagnostic Monitor tests for voltages outside of the normal range. The powertrain control module (PCM) also compares actual MAP output to calculated values to determine sensor performance deterioration. The calculated values are based on throttle position and various engine load factors.

Check Engine Light (CEL) OBDII Codes Potential Diagnosis
P0105 MAP/Barometric Pressure Circuit
P0106 MAP/Baro Pressure out of range
P0107 MAP/Baro Pressure Low Input
P0108 MAP/Baro Pressure High Input
P0109 MAP/Baro Pressure Circuit Intermittent


Advantages of using a NAPA Echlin Manifold Absolute Pressure (MAP) Sensor Replacement Unit are:

  1. Complete control of the manufacturing process from componentry to finished product to ensure long-life.
  2. Engineered to OE specifications and fitment to ensure a precise PCM signal and easy installation.
  3. NAPA ECHLIN MAP sensors are backed by a 3 year/36,000 mile warranty.

Read more about map sensors on our Know How Blog

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