Sebring L4-122 2.0L DOHC VIN Y MFI (1995)
Manifold Pressure/Vacuum Sensor: Description and Operation
No Change In MAP From Start to Run
NAME OF CODE:
No Change in MAP From Start to Run
WHEN MONITORED:
With engine RPM above 400 but less than 1500 and the throttle body at closed throttle.
SET CONDITION:
Too small a difference is seen between barometric pressure at ignition ON and manifold vacuum (engine running) for 1.76 seconds.
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
Powertrain Control Module (PCM) cavity 29. The MAP sensor puts out a low voltage signal (0.5 to 1.8 volts) at idle when the 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 43; voltage may vary from 4.8 to 5.1 volts. The sensor ground is provided by PCM cavity 51.
POSSIBLE CAUSES:
-
Restricted or leaking vacuum/pressure to MAP sensor
-
Ice in sensor or passage
-
Failed sensor
-
Failed PCM
