P0106 - POOR PERFORMANCE BAROMETRIC PRESSURE SENSOR

The PCM (Powertrain Control Module) uses the MAP sensor (Manifold Absolute Pressure) and thus monitors the load of the motor.

The Power Train Control Module (PCM) sends a 5-volt reference signal to the Manifold Absolute Pressure (MAP) sensor, similarly providing a ground circuit. As the manifold pressure changes with the load, the MAP (Manifold Absolute Pressure) sensor informs the PCM (Powertrain Control Module).

When the vehicle is idling the voltage should be from 1 to 1.5 volts and approximately 4.5 volts when the vehicle accelerates completely. The Power Train Control Module (PCM) looks for any variation in manifold pressure by a change in the engine load, either in changes of the engine speed, in the throttle angle or in the EGR system (Exhaust Gas Recirculation).

In case the PCM does not see any of these factors, it changes, but if on the contrary it detects a rapid change in the value of the map, the DTC code P0106 ​​is obtained.

• The Check Engine light is on.
• At idle, the engine is unstable.
• Explosion of black smoke through the exhaust pipe.
• The engine may lose speed.

A P0106 code ​​can be caused by some of the following problems:

• There may be water or some other element in the Manifold Absolute Pressure (MAP) sensor connector, which causes it to malfunction.
• Some cable or connector of the MAP sensor (Manifold Absolute Pressure) may be short-circuited and thus interferes with the reference signal.
• Corrosion caused by the intermittent signal problem may affect the circuit ground.
• The existence of a fracture in the air intake duct between the MAF sensor and the intake manifold.

To solve the diagnostic code P0106 ​​you can review the following components:

• Using an analysis tool with the engine off and the ignition switch in second position, verify that the parameters of the MAP (Manifold Absolute Pressure sensor) are within specifications. Compare the Barometric Pressure (BARO) readings with the Multiple Absolute Pressure (MAP) Sensor, which should be similar. In the case of the MAP sensor, it should be approximately 4.5 volts. Now turn on the vehicle and check if there is a significant drop in MAP sensor voltage, which indicates that the sensor is working correctly.
• Check that the cables and their connectors are connected correctly and do not show signs of wear. Repair or change if necessary.
• Check the vacuum tubes and make sure they are not damaged or cracked. Change if necessary.
• Examine the Manifold Absolute Pressure sensor (MAP) and check that the sensor hole is not obstructed by any impurities.
• Replace the Manifold Absolute Pressure (MAP) sensor in case the levels are not within the factory specifications.