Manifold Absolute Pressure (MAP) Sensor

MAP sensor connects to ECM by a wire harness and to engine by a manifold vacuum hose. ECM supplies monitors a 5-volt reference signal to MAP sensor. MAP sensor voltage varies according to changes in engine load (manifold vacuum).

ECM interprets voltage change as changes in engine load and uses signal to help determine control of fuel injector, shift-indicator light, and EGR solenoid.