P0107 - BAROMETRIC PRESSURE CIRCUIT LOW INPUT / MANIFOLD ABSOLUTE PRESSURE

The MAP (Manifold Absolute Pressure) sensor acts on changes in the pressure in the intake manifold. The Powertrain Control Module (PCM) provides 5 volts of power to the Manifold Absolute Pressure (MAP) Sensor.

This sensor has a resistance, which makes movements taking into account the pressure of the manifold. The voltage of this resistance may vary according to the motor load, it can be between 0.1 and 4.5 volts. This signal returns to the PCM (Powertrain Control Module) referring to the vacuum in the manifold. In this way, the PCM can define the fuel supply. Besides, If the Powertrain Control Module (PCM) detects that the MAP sensor voltage is below 0.25 volts, the fault code P0107 OBD2 is set.

• The Chek Engine service light is on.
• Difficulty starting the engine.
• At idle, the engine is unstable.
• The fuel economy is not adequate.
• Black smoke from the exhaust pipe.

When a diagnostic code P0107 is set it can mean that:

• There may be a short in the 5-volt reference circuit or even in the signal circuit.
• Perhaps, one of the wires is rubbing or wearing out, causing a short circuit.
• The Manifold Absolute Pressure (MAP) Sensor may be defective.

When solving the code P0107 OBD, you could do the following

• With the engine running, check the voltage of the MAP (Manifold Absolute Pressure) sensor, if you notice that it displays less than 5 volts, turn off the engine and disconnect the MAP sensor, and with a multimeter, make sure that there are 5 volts of reference.
• If the 5-volt reference is not available, check the reference voltage on the Powertrain Control Module (PCM) connector. If the 5 volts is on the PCM connector but not on the MAP connector, it indicates an open short in the reference circuit between the PCM cable connector and the MAP Repair or replace as necessary.
• If you have the 5-volt reference on the MAP sensor connector, bridge the reference circuit to the signal circuit. Then, with a scanning tool, check the voltage of the MAP sensor, which should be between 4.5 and 5 volts. If so, change the MAP sensor. If it does not have the reference volts, it may mean that there is a short circuit in the signal circuit wires. Repair and check again.
• If the voltages are OK, with the motor running, move the cables and connectors of the MAP sensor and if you notice any change in the voltage. Repair or replace as necessary.
• Replaces the MAP