No 5 Volts to MAP Sensor

NAME OF CODE:
No 5 Volts to MAP Sensor

WHEN MONITORED:
With the ignition OFF.

SET CONDITION:
The MAP sensor signal voltage goes below 1.96 volts.

THEORY OF OPERATION:
This sensor measures manifold absolute pressure and ambient barometric pressure within the manifold. It provides a 0 to 5 volt signal to PCM cavity 36. The MAP sensor puts out a low voltage signal (0.5 to 1.8 volts) at idle when manifold vacuum is high, and a higher voltage signal (3.9 to 4.8 volts) at deep throttle when the manifold vacuum is low.

- The MAP receives a 5 volt supply from PCM cavity 61; voltage may vary from 4.8 to 5.1 volts.
- The sensor ground is provided by PCM cavity 43.

POSSIBLE CAUSES:
- Open 5 volt supply
- MAP sensor failure