Sebring L4-122 2.0L DOHC VIN Y MFI (1995)
Manifold Pressure/Vacuum Sensor: Description and Operation
MAP Sensor Voltage Too Low
NAME OF CODE:
MAP Sensor Voltage Too Low
WHEN MONITORED:
With engine RPM above 400 but less than 1500 and the Throttle Position (TP) sensor voltage less than 1.0 volt.
SET CONDITION:
The Manifold Absolute Pressure (MAP) sensor signal voltage is below 1.2 volts at start, or below 0.2 volt for 1.76 seconds with engine running.
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 open 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:
-
Open 5-volt supply circuit
-
Signal circuit shorted to ground
-
Failed sensor
-
Failed PCM
