Circuit/System Description

The alternative fuel tank pressure sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and a 5 V reference circuit. The Engine Control Module monitors the signal of the pressure sensor to determine the amount of pressure in the tank. When the engine is running on CNG, the Engine Control Module uses this signal in order to calculate the percentage of remaining gas in the tank. The Engine Control Module sends the fuel level to the instrument cluster via serial data. The instrument cluster then displays the approximate level on the fuel level gauge.

When the engine is in gasoline mode: The instrument cluster displays gasoline fuel level on the fuel gauge and CNG fuel level can be viewed on the Driver Information Center.

When the engine is in CNG mode: The instrument cluster displays CNG fuel level on the fuel gauge and gasoline fuel level can be viewed on the Driver Information Center.