Manifold Absolute Pressure And Temperature Sensor
WARNING: This page is about a different variant/trim than selected.
A single Manifold Absolute Pressure and Temperature (MAPT) sensor is located in the intake manifold downstream of the electric throttle. The sensor provides a voltage signal to the Powertrain Control Module (PCM) relative to the intake manifold pressure and temperature.
The MAPT sensor has a four pin connector which is connected to the PCM and provides:
- A reference voltage from the PCM.
- A pressure signal input to the PCM.
- A temperature signal input to the PCM.
- A ground connection.
The MAPT sensor uses a diaphragm transducer to measure the air pressure.
The PCM uses the MAPT sensor signal for the following functions:
- Maintain manifold boost pressure.
- Reduce exhaust smoke emissions when driving at high altitude.
- Control of the Exhaust Gas Recirculation (EGR) system.
If the MAPT sensor fails, the PCM uses a default pressure of 1013 mbar (14.7 psi). In the event of a MAPT sensor failure, the following symptoms may be observed:
- Altitude compensation inoperative (black smoke emitted from the exhaust).
- Active boost control inoperative.