TheManifold Absolute Pressure (MAP) Sensor is used to measure engine load. It receives a reference signal from the PCM (Powertrain Control Module), which changes according to the vacuum of the manifold. This information is used by the PCM to adjust the ignition time and fuel delivery. The vehicle may use a Barometric Pressure Sensor (BARO), which is completely independent. This device only measures barometric pressure and is similar to the MAP Sensor in design, but is much more sensitive to changes in atmospheric pressure.
The PCM examines the voltage of both sensors at idle, in case it finds a difference. If there is a large difference at the input of these sensors, the DTC codeP0069 OBDII is set. It is also worth mentioning that the PCM observes the voltages of these sensors to determine if they are correct when the accelerator is in the open position.
When diagnostic code P0069 OBD2 is set it means that one or more of the following has occurred:
A vacuum line between the intake manifold and the MAP Sensor may have elements obstructing it.
The Manifold Absolute Pressure Sensor (MAP) circuit may have deficiencies.
The MAP Sensor may be defective.
BARO Sensor Circuit Failures.
Defective Barometric Pressure (BARO) Sensor.
Possible solutions of the DTC code P0069 Generic
When fixing the fault code P0069 OBDII takes into account the following:
Check if there is TSB (Technical Service Bulletins) for your specific vehicle.
After placing the MAP sensor in your vehicle, inspect all connectors and cables. If one of these components has burn points or rubs, you must correct it. Also, inspect the connector terminals, as they may be corroded. Change as needed.