Intrepid V6-201 3.3L Flex Fuel (1994)
Methanol Concentration Sensor: Description and Operation
Fuel Tank Mounted Components, Methanol Concentration Sensor Location
PURPOSE
The Powertrain Control Module (PCM) uses input to determine percentage of methanol in fuel and adjusts engine parameters accordingly.
The vehicle can operate on methanol concentrations of up to 85 %
OPERATION
The sensor contains a microprocessor and outputs voltage to the PCM that corresponds to percentage of methanol in fuel system.
The Powertrain Control Module (PCM) supplies sensor with 8 volt reference voltage.
Sensor output voltage varies from 0.5 volts (for pure gasoline), to 4.50 volts (for 85 % methanol).
If sensor shuts down, PCM defaults to last measured percentage of methanol.
CIRCUIT OPERATION
The methanol concentration sensor is used to determine the amount of gasoline and methanol in the fuel system. Power for the sensor is supplied
by circuit K7. This circuit is the 8 Volt feed from the Powertrain Control Module (PCM) and connects to cavity 7 of the PCM.
Input to the PCM is accomplished on circuit K50. This circuit connects between the sensor and cavity 50 of the PCM.
A ground for the sensor is provided on circuit K4. This circuit connects to cavity 4 of the PCM.