Vehicle Speed Signal

Vehicle speed signal is transmitted from the Anti-Lock Brake System/Acceleration Slip Regulation (ABS/ASR) module to electronic accelerator control module (with ASR), or from the ABS control module to cruise control/idle speed control module (without ASR). Vehicle speed signal is then transmitted from respective module through Controller Area Network (CAN) to engine control module. The engine control module uses vehicle speed signal to control deceleration fuel injection shutoff, engine RPM limiter, 2-3 upshift delay, and drive shaft maximum RPM limitation.

Fig 1: Locating HFM-SFI System Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Locating HFM-SFI System Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Locating HFM-SFI System Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.