The Electronic Control Module is responsive to a preset signal limit, and when the limit is reached, the ECM signals the Fuel Control Valve to close. This limits the fuel and results in a gentle but positive vehicle speed limitation.
The Hewitt Vehicle Speed Limiter System is an electro-mechanical system designed for vehicles equipped with diesel engines using in-line or rotary type injection pumps. It is a tamper free and easy to install system using no mechanical linkage, resulting in a system requiring no maintenance. It consists of only three basic components; an Electronic Control Module (ECM), an electro-mechanical Fuel Control Valve (FCV) and an electro-mechanical Pressure Regulating Valve (PRV) along with connecting electrical harness and related hardware. A signal generator is also available if required.