Circuit/System Description

The driver efficiency gauge shows when the vehicle is operating at a fuel efficient point. There are several zones on the gauge indicating different levels of efficiency. The gauge shall indicate fuel efficiency when the engine is running and will be set at the minimum scale position when the ignition transitions to a mode other than when the engine is running. The gauge will set at its half scale position when there is a loss of communication. The engine control module (ECM) provides information to the instrument panel cluster (IPC) for the driver efficiency gauge via the serial data circuit.