The BARO Sensor (Barometric Pressure Sensor) provides the ECM (Engine Control Module) with data from which the atmospheric pressure is known. The MAP Sensor(Manifold Absolute Pressure Sensor) tells the ECM the manifold pressure, and with this information, the air density is calculated. All of this data is used to determine the amount of air needed to carry out the combustion process.
The OBDII DTC P1105 is a manufacturer-specific code, which in most cases shows that the ECM has found a malfunction in the Manifold Absolute Pressure Switch (MAP)/Barometric (BARO) solenoid valve. If the voltage signal received by the ECM is too low or too high, this code will be set.
The reasons for setting the P1105 OBD2 fault code are as follows:
There may be damage to the wiring or connectors of system-related circuits.
Manifold Absolute Pressure (MAP) switch solenoid electrical harness may be shorted.
Manifold Absolute Pressure Sensor may be faulty.
The ECM may have programming errors.
Possible solutions of the DTC code P1105
Steps to correct the P1105 OBDII diagnostic code:
See Technical Service Bulletins (TSB).
Check the wiring and connectors that are closely related to the Manifold Absolute Pressure switch solenoid. If damage is discovered due to excessively high temperatures or rubbing, make any necessary repairs or replacements.
Verify that the MAP Sensor circuit meets the voltage requirements listed in the service manual. If there are inconsistencies in one of these electrical values, repairs should be made as required.
Check the MAP Sensor and BARO Sensor for proper condition. Verify that the resistance of these is as indicated in the manufacturer's specifications. If you determine that one of these is faulty, replace it.