P0105 - MAP CIRCUIT MALFUNTION

The Manifold Absolute Pressure (MAP) provides instantaneous information about manifold pressure to the Powertrain Control Module (PCM), which uses this data to calculate the air density and thus determine the mass / air flow rate of the engine. In the same way, the dosage of the necessary fuel is determined so that there is an optimum combustion.

The Powertrain Control Module (PCM) compares the signal of other sensors with respect to that of the Manifold Absolute Pressure sensor (MAP), in order to check that it is working correctly. For example, compare the signal from the throttle position sensor (TPS) with that of the Manifold Absolute Pressure sensor (MAP) so that the signal from the latter sensor is not fixed.

In the event that the Powertrain Control Module (PCM) does not observe a change in the MAP sensor, a change in the TPS sensor occurs and the diagnostic code P0105 is established.

• The Check Engine light is on.
• Engine ignition fault.
• The engine idling is irregular.
• Engine instability.

A code P0105 can be caused by one or more of the following problems:

• Some vacuum hose from the Manifold Absolute Pressure (MAP) may be disconnected.
• The Manifold Absolute Pressure sensor (MAP) connector may be defective.
• MAP sensor cables may be shorted.
• Manifold Absolute Pressure (MAP) sensor may be defective.

To solve the OBDII code P0105 you can review the following components:

• Inspect the cable system and Manifold Absolute Pressure (MAP) sensor connector for any wear of these. Repair or replace if necessary.
• Unplug the connector of the MAP sensor and the signal cable in the connector of the PCM. Then check the continuity of the connector of the MAP sensor, in case there is incalculable resistance you must repair the circuit signal. If there is continuity in the signal cable together with the connector of the MAP sensor, you should check that there is 5 volts of reference to the connector, in addition to a good soil. If so, install all the wiring and you can substitute the MAP sensor.