When idling, intake pressure usually ranges from 16-22 in. Hg. Because this is lower than atmospheric pressure, air rushes into the intake. When the driver uses the engine to brake, pressure can go as low as 10 in. Hg. Upon accelerating, however, the open throttle body allows air to rush in faster, increasing pressure in the intake. The MAP sensor, or the manifold absolute pressure sensor, is an essential component of the engine management system in the Honda Accord. Also, a MAP sensor is found in fuel-injected vehicles, and its primary function is to provide information about intake manifold pressure to the Powertrain Control Module (PCM/ECM). Symptoms of a bad or failing MAP sensor include: 1. Excessive fuel consumption A MAP sensor that measures high intake manifold pressure indicates high engine load to the 2. Lack of power A MAP sensor that measures low intake manifold pressure indicates low engine load to the PCM. The PCM 3. Symptoms Of A Bad MAP Sensor 1. Check Engine Light. The engine control unit constantly monitors all the sensors in your car engine while you drive 2. Lean Air-fuel Mixture. The MAP sensor's primary purpose is to measure the air pressure in the intake manifold to 3. Rich Air-fuel Mixture. The The manifold absolute pressure sensor measures the pressure in the air intake manifold and sends this data to the engine control unit (ECU). The ECU uses this information to determine the air -fuel ratio for the combustion process , thereby influencing engine performance and efficiency. What are the symptoms of a bad manifold absolute pressure sensor? The main symptoms of a bad manifold absolute pressure sensor include poor engine performance, roughly running engine, changes in fuel consumption, and increased gas emissions. What Are The Signs Of a Failing MAP Sensor? As the MAP sensor fails, it can cause various issues with the fuel system and vehicle performance. An inaccurate reading from the sensor will cause MAP Sensor calculates the pressure inside the intake manifold. (Photo: Mechanic) Bad MAP Sensor Symptoms: Detecting The Issues. The symptoms of a failing manifold pressure sensor are similar to the problems of low compression or improper fuel injection. Shop for New Auto Parts at 1AAuto.com this video to learn all about Manifold Absolute Pressure (MAP) sensors, and how Llc0sD.